789818-01

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## POWER SUPPLY 

- AC 100-240 V Wide-range Input 

- Width only 39 mm 

- Efficiency up to 95.2% 

- Excellent Partial Load Efficiency 

- 20% Output Power Reserves (PowerBoost) 

- Safe Hiccup _[PLUS]_ Overload Mode 

- Easy Fuse Breaking due to High Overload Peak Current 

- Active Power Factor Correction (PFC) 

- Minimal Inrush Current Surge 

- Full Power Between -25 °C and +60 °C 

- DC-OK Relay Contact 

- 1 Year Warranty 

## PRODUCT DESCRIPTION 

The NI PS-26 is a high-end power supply in a medium price range without compromising quality, reliability, and performance. The most outstanding features of the NI PS-26 are the high efficiency, advanced inrush current limitation, active PFC, and the wide operational temperature range. 

The NI PS-26 includes all the essential basic functions. The device also offers PowerBoost: power reserves of 20%, which may even be used continuously at temperatures up to +45 °C. Additionally, the NI PS-26 can deliver three times the nominal output current for at least 12 ms, which helps to trip fuses on faulty output branches. 

High immunity to transients and power surges as well as low electromagnetic emission, a DC-OK relay contact, and a large international approval package for a variety of applications makes this unit suitable for nearly every situation. 

## ORDER NUMBERS 

Power Supply NI PS-26 Accessory 139683-01 Side mounting kit for NI PS-26 

## - SHORT FORM DATA 

|Output voltage|DC 24 V|Nominal|
|---|---|---|
|Adjustment range|24–28 V|Factorysetting24.1 V|
|Output current|10.0–8.6 A|Up to +60 °C ambient|
||7.5–6.5 A|At +70 °C ambient|
||Derate linearly between +60 °C and +70 °C||
|PowerBoost|12.0 A|Up to +45 °C ambient|
|Input voltage AC<br>Mains frequency<br>Input current AC<br>Power factor|Linear decrease to nominal power between<br>+45 °C and +60 °C<br>AC 100-240 V<br>50-60 Hz<br>2.15/1.1 A<br>0.99/0.97|Linear decrease to nominal power between<br>-15%/+10%<br>±6%<br>At 120/230 Vac<br>At 120/230 Vac|
|Input voltage DC|DC 110-150 V±20%||
|Input current DC|2.35 A|At 110 Vdc|
|Input inrush current|6/9 Apk|At 40 °C 120/230 Vac|
|Efficiency|93.6/95.2%|At 120/230 Vac|
|Losses|16.4/12.1 W|At 120/230 Vac|
|Hold-uptime|37/37 ms|At 120/230 Vac|
|Temperature range|-25 °C to +70 °C||
|Size (w x h x d)|39 x 124 x 117 mm|39 x 124 x 117 mm<br>Without DIN rail|
|Weight|600g||



## MAIN APPROVALS 

For details and the complete approval list, see section 20. 

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**----- Start of picture text -----**<br>
Class I Div 2  UL 508<br>**----- End of picture text -----**<br>


## October 2023/Rev. 1.7 NI PS-26 

1/23 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## NI PS-26 

## TABLE OF CONTENTS 

||Page||Page|
|---|---|---|---|
|1.|Intended Use ................................................................ 3|20. Approved, Fulfilled or Tested Standards .................... 15||
|2.|Installation Instructions ................................................ 3|21. Regulatory Product Compliance ................................ 16||
|3.|AC-Input ....................................................................... 4|22. Physical Dimensions and Weight ............................... 17||
|4.|DC-Input ....................................................................... 5|23. Accessories ................................................................. 17||
|5.|Input Inrush Current ..................................................... 6|23.1.|Side Mounting Bracket—139683-01 ................ 17|
|6.|Output .......................................................................... 6|24. Application Notes ....................................................... 18||
|7.|Hold-up Time ................................................................ 8|24.1.|Peak Current Capability .................................... 18|
|8.|DC-OK Relay Contact .................................................... 8|24.2.|Back-feeding Loads .......................................... 19|
|9.|Efficiency and Power Losses ......................................... 9|24.3.|External Input Protection ................................. 19|
|10.|Lifetime Expectancy ..................................................... 9|24.4.|Output Circuit Breakers .................................... 19|
|11.|MTBF .......................................................................... 10|24.5.|Series Operation ............................................... 20|
|12.|Terminals and Wiring ................................................. 10|24.6.|Parallel Use to Increase Output Power ............ 20|
|13.|Functional Diagram .................................................... 11|24.7.|Parallel Use for Redundancy ............................ 21|
|14.|Front Side and User Elements .................................... 12|24.8.|Charging of Batteries ........................................ 21|
|15.|EMC ............................................................................ 12|24.9.|Operation on Two Phases ................................ 22|
|16.|Environment ............................................................... 13|24.10.|Use in a Tightly Sealed Enclosure ..................... 22|
|17.|Protection Features .................................................... 14|24.11.|Mounting Orientations ..................................... 22|
|18.|Safety Features ........................................................... 14|||
|19.|Dielectric Strength ...................................................... 15|||



The information given in this document is correct to the best of our knowledge and experience at the time of publication. If not expressly agreed otherwise, this information does not represent a warranty in the legal sense of the word. As the state of our knowledge and experience is constantly changing, the information in this data sheet is subject to revision. 

No part of this document may be reproduced or utilized in any form without our prior permission in writing. 

## TERMINOLOGY AND ABBREVIATIONS 

**PE and symbol** PE is the abbreviation for **P** rotective **E** arth and has the same meaning as the symbol . **Earth, Ground** This document uses the term “earth” which is the same as the U.S. term “ground.” **t.b.d.** To be defined, value or description will follow later. **AC 230 V** A figure displayed with the AC or DC before the value represents a nominal voltage with standard tolerances (usually ±15%) included. For example: DC 12 V describes a 12 V battery disregarding whether it is full (13.7 V) or flat (10 V). **230 Vac** A figure with the unit (Vac) at the end is a momentary figure without any additional tolerances included. **50 Hz vs. 60 Hz** As long as not otherwise stated, AC 100 V and AC 230 V parameters are valid at 50 Hz mains frequency. AC 120 V parameters are valid for 60 Hz mains frequency. **may** A key word indicating flexibility of choice with no implied preference. **shall** A key word indicating a mandatory requirement. **should** A key word indicating flexibility of choice with a strongly preferred implementation. 

October 2023/Rev. 1.7 NI PS-26 

2/23 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 1. INTENDED USE ~~ee~~ 

This device is designed for installation in an enclosure and is intended for commercial use, such as in industrial control, process control, monitoring, and measurement equipment or the like. 

Do not use this device in equipment where malfunctioning may cause severe personal injury or threaten human life without additional appropriate safety devices that are suited for the application. If this device is used in a manner outside of its specification, the protection provided by the device may be impaired. 2. INSTALLATION INSTRUCTIONS **WARNING[Risk of electrical shock, fire, personal injury, or death.]** - Turn power off before working on the device and protect against inadvertent re-powering. - Do not open, modify, or repair the device. - Use caution to prevent any foreign objects from entering into the housing. - Do not use in wet locations or in areas where moisture or condensation can be expected. - Do not touch during power-on, and immediately after power-off. Hot surface may cause burns. Obey the following installation instructions: This device may only be installed and put into operation by qualified personnel. This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect. If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to the factory for inspection. Install device in an enclosure providing protection against electrical, mechanical, and fire hazards. Install the device onto a DIN rail according to EN 60715 with the input terminals on the bottom of the device. Other mounting orientations require a reduction in output current. Make sure that the wiring is correct by following all local and national codes. Use appropriate copper cables that are designed for a minimum operating temperature of 60 °C for ambient temperatures up to +45 °C, 75 °C for ambient temperatures up to +60 °C, and 90 °C for ambient temperatures up to +70 °C. Ensure that all strands of a stranded wire enter the terminal connection. Use ferrules for wires on the input terminals. Unused screw terminals should be securely tightened. The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed. The enclosure of the device provides a degree of protection of IP20. The enclosure does not provide protection against spilled liquids. The isolation of the device is designed to withstand impulse voltages of overvoltage category III according to IEC 60664-1. The device is designed as “Class of Protection I” equipment according to IEC 61140. Do not use without a proper PE (Protective Earth) connection. The device is suitable to be supplied from TN, TT, or IT mains networks. The continuous voltage between the input terminal and the PE potential must not exceed 300 Vac. The input can also be powered from batteries or similar DC sources. The continuous voltage between the supply voltage and the PE/ground potential must not exceed 375 Vdc. A disconnecting means shall be provided for the input of the device. The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do not cover ventilation grid! The device is designed for altitudes up to 5000 m. Above 2000 m a reduction in output current and over voltage category is required. Keep the following minimum installation clearances: 40 mm on top, 20 mm on the bottom, 5 mm left and right side. Increase the 5 mm to 15 mm in case the adjacent device is a heat source. When the device is permanently loaded with less than 50%, the 5mm can be reduced to zero. October 2023/Rev. 1.7 NI PS-26 All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 3/23 ~~_~~ 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

The device is designed, tested, and approved for branch circuits up to 32 A (IEC) and 30 A (UL) without additional protection device. If an external fuse is utilized, do not use circuit breakers smaller than 6 A B- or C-Characteristic to avoid a nuisance tripping of the circuit breaker. 

The maximum surrounding air temperature is +70 °C. The operational temperature is the same as the ambient or surrounding air temperature and is defined 2 cm below the device. 

The device is designed to operate in areas between 5% and 95% relative humidity. 

## **Installation Instructions for Hazardous Location Areas** 

The device is suitable for use in Class I Division 2 Groups A, B, C, D locations. 

## **WARNING EXPLOSION HAZARDS!** 

Use only in standard vertical mounting orientation with the input terminals on bottom of the unit. Substitution of components may impair suitability for this environment. 

Do not disconnect the device or operate the voltage adjustment unless power has been switched off or the area is known to be nonhazardous. 

A suitable enclosure must be provided for the end product. 

## 3. AC-INPUT 

|3. AC-INPUTNPUT||||
|---|---|---|---|
|AC input|Nom.|AC 100-240 V|Suitable for TN-, TT-, and IT mains networks|
|AC input range||85-264 Vac||
|||264-300 Vac|For maximal 500 ms|
|Allowed voltage L or N to earth|Max.|300 Vac|Continuous, accordingto IEC 62477-1|
|Input frequency|Nom.|50–60 Hz|±6%|
|Turn-on voltage|Typ.|80 Vac|Steady-state value, see Fig. 3-1|
|Shut-down voltage|Typ.|70 Vac|Steady-state value, see Fig. 3-1|
||Typ.|55 Vac|Dynamic value for maximal 250 ms|
|External inputprotection|See recommendations in section 24.3.|||



|||**AC 100 V**|**AC 120 V**|**AC 230 V**||
|---|---|---|---|---|---|
|Input current|Typ.|2.60 A|2.15 A|1.13 A|At 24 V, 10 A, see Fig. 3-3|
|Power factor*)|Typ.|0.99|0.99|0.97|At 24 V,10 A,see Fig. 3-4|
|Crest factor**)|Typ.|1.5|1.5|1.65|At 24 V, 10 A|
|Start-up delay|Typ.|300 ms|290 ms|240 ms|See Fig. 3-2|
|Rise time|Typ.|30 ms|30 ms|30 ms|At 24 V, 10 A const. current load, 0mF|
||||||load capacitance, see Fig. 3-2|
||Typ.|75 ms|75 ms|75 ms|at 24 V, 10 A const. current load, 10 mF|
||||||load capacitance,see Fig. 3-2|
|Turn-on overshoot|Max.|200 mV|200 mV|200 mV|See Fig. 3-2|
|External inputprotection|See recommendations in section 24.3.|||||



*) The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit. 

**) The crest factor is the mathematical ratio of the peak value to RMS value of the input current waveform. 

## October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

pS 

4/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

**==> picture [514 x 287] intentionally omitted <==**

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Fig. 3-1    Input voltage range  Fig. 3-2    Turn-on behavior, definitions<br>Rated<br>POUT input range max. Input<br>~———> 500ms Voltage<br>| |<br>| |<br>|| || || —____V_4<br>| | Output | - 5% “=<br>|| Voltage |<br>|| VIN Start-up Rise |<br>| delay | Time |<br>85V ‘ 264V ‘ 300Vac t— | }<br>Fig. 3-3    Input current vs. output current at 24V output  Fig. 3-4    Power factor vs. output current at 24V output<br>voltage  voltage<br>Input Current, typ. Power Factor, typ.<br>3A i a 1.0 TS<br>2.5 ial | a) 100Vac roto | | b 0.95 (aa) rai+—+-|-4+-tsroiotroiot ) +—+-|-4+-tsroiotroiot | bid=F=F Fh<br>2.0 | b) 120Vac a a oo (b) i | |<br>| c) 230Vac | | ro 0.9<br>1.51.0 4-+-FoAsy4- | | | CO +—ts | ee | | a| | || c 0.85 is a ee ee | | | | (c) aee | ee ||| cal | | ee | | ||| | | (a) 100Vac, (b) 120Vac, (c) 230Vac | | 1| |<br>0.5 0.8<br>Tete | es<br>0 Output Current 0.75 Soy taleeee EE Output Current<br>1 2 3 4 5 6 7 8 9 10 11 12A<br>Turn-on<br>Shut-down<br>Overshoot<br>**----- End of picture text -----**<br>


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voltage<br>Power Factor, typ.<br>1.0 TS<br>(aa)<br>0.95 rai+—+-|-4+-tsroiotroiot | bid=F=F Fh<br>(b) i | |<br>0.9<br>| | | cal | ee | | (a) 100Vac, | | |<br>0.85 | | ||| | | ||| | (b) 120Vac, |<br>is a ee ee (c) aee (c) 230Vac 1|<br>0.8<br>| es<br>Soy taleeee EE<br>Output Current<br>0.75<br>1 2 3 4 5 6 7 8 9 10 11 12A<br>**----- End of picture text -----**<br>


## 4. DC-INPUT 

|4. DC-INPUTNPUT||||
|---|---|---|---|
|DC input|Nom.|DC 110-150 V|±20%|
|DC input range||88-180 Vdc||
|DC input current|Typ.|2.35 A|At 110 Vdc, at 24 V, 10 A|
|Allowed Voltage L/N to Earth|Max.|375 Vdc|Continuous,accordingto IEC 62477-1|
|Turn-on voltage|Typ.|80 Vdc|Steady state value|
|Shut-down voltage|Typ.|70 Vdc|Steady state value|
||Typ.|55 Vdc|Dynamic value for maximal 250 ms|



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Fig. 4-1    Wiring for DC Input<br>**----- End of picture text -----**<br>


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**----- Start of picture text -----**<br>
Battery Power Supply<br>+ GC, AC<br>—_r_ L<br>N +<br>Load<br>PE<br>-<br>_T1 _ OD | a<br>—_r_ SF<br>-<br>CO DC<br>**----- End of picture text -----**<br>


## **Instructions for DC use:** 

- a) Use a battery or a similar DC source. A supply from the intermediate DC-bus of a frequency converter is not recommended and can cause a malfunction or damage the unit. 

- b) Connect +pole to L and –pole to N. 

- c) Connect the PE terminal to an earth wire or to the machine ground. 

## October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

5/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## 5. INPUT INRUSH CURRENT 

An active inrush limitation circuit (NTCs, which are bypassed by a relay contact) limits the input inrush current after turn-on of the input voltage. 

The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on. 

|||**AC 100 V**|**AC 120 V**|**AC 230 V**||
|---|---|---|---|---|---|
|Inrush current|Max.|11 Apeak|7 Apeak|11 Apeak|At 40°C, cold start|
||Typ.|9 Apeak|6 Apeak|6 Apeak|At 25°C, cold start|
||Typ.|9 Apeak|6 Apeak|9 Apeak|At 40°C, cold start|
|Inrush energy|Max.|0.1 A²s|0.1 A²s|0.4 A²s|At 40°C, cold start|



Fig. 5-1 **Typical turn-on behaviour at nominal load, 120 Vac input and 25 °C ambient** 

Fig. 5-2 **Typical turn-on behaviour at nominal load, 230 Vac input and 25 °C ambient** 

## 6. OUTPUT 

|6. OUTPUTUTPUT||||
|---|---|---|---|
|Output voltage|Nom.|24 V||
|Adjustment range||24-28 V|Guaranteed value|
||Max.|30.0 V|This is the maximum output voltage which can occur at the|
||||clockwise end position of the potentiometer due to|
||||tolerances. It is not a guaranteed value which can be|
||||achieved.|
|Factorysettings|Typ.|24.1 V|±0.2%,at full load and cold unit|
|Line regulation|Max.|10 mV|Between 85 and 300 Vac|
|Load regulation|Max.|50 mV|Between 0 and 12 A,static value,see Fig. 6-1|
|Ripple and noise voltage|Max.|50 mVpp|Bandwidth 20 Hz to 20 MHz, 50 Ohm|
|Output current|Nom.|10 A|At 24 V and up to +60 °C ambient temperature, see Fig. 6-1|
||Nom.|7.5 A|At 24 V and +70 °C ambient temperature, see Fig. 16-1|
||Nom.|8.6 A|At 28 V up to +60 °C ambient temperature, see Fig. 6-1|
||Nom.|6.45 A|At 28 V and +70 °C ambient temperature, see Fig. 16-1|
||Derate linearly between +60 °C and +70 °C, see section 16|Derate linearly between +60 °C and +70 °C, see section 16||
|PowerBoost1)|Nom.|12 A|At 24 V and up to +45 °C ambient temperature, see Fig. 16-1|
||Nom.|10.3 A|At 28 V and up to +45 °C ambient temperature, see Fig. 16-1|
||PowerBoost decreases linearlyto nominalpower between +45 °C and +60 °C, see section 16|||



All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

October 2023/Rev. 1.7 NI PS-26 

6/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

|Fuse breaking current|Typ.|30 A|For minimal 12 ms once every five seconds, see Fig. 6-2.|
|---|---|---|---|
||||The output voltage stays above 20 V. See section 24.1 for|
||||more peak current measurements. For AC 100 V mains, the|
||||pulse length is shorter than 12 ms.|
|Overload behaviour||Continuous current|Output voltage above 13 Vdc, see Fig. 6-1|
|||Hiccup_PLUS_mode2)|Output voltage below 13 Vdc,see Fig. 6-1|
|Short-circuit current|Min.|12.5 A3)|Load impedance <45 mOhm, see Fig. 6-3|
||Max.|15.5 A3)|Load impedance <45 mOhm, see Fig. 6-3|
||Max.|5 A|Average (R.M.S.) current, load impedance 50 mOhm, see Fig. 6-3|
||Min.|28 A|Up to 12 ms, load impedance <45 mOhm, see Fig. 6-2|
||Typ.|30.5 A|Upto 12 ms, load impedance <45 mOhm, see Fig. 6-2|
|Output capacitance|Typ.|4400µF|Included inside thepower supply|



- 1) **PowerBoost** This power/ current is continuously allowed up to an ambient temperature of +45 °C. 

Above +45 °C, do not use this power or current longer than a duty cycle of 10% and/or not longer than 1 minute every 10 minutes. 

2) **Hiccup** _**[PLUS]**_ **Mode** 

At heavy overloads (when output voltage falls below 13 V), the power supply delivers continuous output current for 2 s. After this, the output is switched off for approx. 18 s before a new start attempt is automatically performed. This cycle is repeated as long as the overload exists. If the overload has been cleared, the device will operate normally. See Fig. 6-3. 

3) Discharge current of output capacitors is not included. 

## Fig. 6-1 **Output voltage vs. output current, typ.** 

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Output Voltage Adjustment<br>28V Range<br>24 ne—L Continuou | s<br>| | | | | current<br>20 —+ Factory ~+-4+-4\4-+--<br>| setting | | | | | |<br>16 i(|<br>12 ee ee | —1_ _|<br>| | | | | |! | |<br>8 4-4 4-4-4} Hiccup [PLUS] |<br>mode<br>4<br>0 ts | ete | Output Current neenenenniete | | | dy l neat nee |<br>0 2.5 5 7.5 10 12.5 15 17.5 20A<br>**----- End of picture text -----**<br>


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Fig. 6-2    Dynamic output current capability, typ.<br>Output Voltage  (dynamic behavior, < 12ms)<br>28V<br>24 Pe —~L_L_I__Iee<br>| | | | | | | |<br>20 - Adjustment 4—4-4-+-++-4<br>1 Range 1 1 | | | | | |<br>16 es  es ee ee | |<br>12 a| |<br>| | | | | | | | | |<br>8 He -4-4—4-q)- pe<br>4<br>SR | asp | Output Current | | | | ap | | | |<br>0<br>0 5 10 15 20 25 30 35 40 45 50A<br>**----- End of picture text -----**<br>


Fig. 6-3 **Short-circuit on output, Hiccup** _**[PLUS]**_ **mode, typ.** 

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Output<br>Current<br>oNormalperation Short -circuit operationNormal<br>| |<br>14A a oe a jy<br>|<br>t<br>0<br>2s 18s 2s 18s 2s 18s<br>**----- End of picture text -----**<br>


All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

October 2023/Rev. 1.7 NI PS-26 

7/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## - 7. HOLD UP TIME 

**==> picture [468 x 210] intentionally omitted <==**

**----- Start of picture text -----**<br>
AC 100 V AC 120 V AC 230 V<br>Hold-up Time  Typ.  73 ms  73 ms  73 ms  At 24 V, 5 A, see Fig. 7-1<br>Min.  55 ms  55 ms  55 ms  At 24 V, 5 A, see Fig. 7-1<br>Typ.  37 ms  37 ms  37 ms  At 24 V, 10 A, see Fig. 7-1<br>Min.  28 ms  28 ms  28 ms  At 24 V, 10 A, see Fig. 7-1<br>Fig. 7-1    Hold-up time vs. input voltage  Fig. 7-2    Shut-down behavior, definitions<br>Hold-up Time<br>80ms a) 24V 5A typ. b) 24V 5A min. c) 24V 10A typ. d) 24V 10A min . Zero Transition<br>70 a Input<br>6050 ——--}--a a ~~} a~~~} ~~ ~~~ b Voltage \ \{\-<——— ||<br>40 —op c |<br>30 d Output - 5%<br>20 Voltage<br>10 Input Voltage Hold-up Time<br>0<br>i T + »<br>90 120 155 190 230Vac<br>**----- End of picture text -----**<br>


## 8. DC-OK RELAY CONTACT 

This feature monitors the output voltage on the output terminals of a running power supply. 

Contact closes As soon as the output voltage reaches typ. 90% of the adjusted output voltage level. Contact opens As soon as the output voltage dips more than 10% below the adjusted output voltage. Short dips will be extended to a signal length of 100 ms. Dips shorter than 1 ms will be ignored. Switching hysteresis 1 V Contact ratings Maximal 60 Vdc 0.3 A, 30 Vdc 1 A, 30 Vac 0.5 A, resistive load Minimal permissible load: 1 mA at 5 Vdc Isolation voltage See dielectric strength table in section 18. 

## Fig. 8-1 **DC-OK relay contact behavior** 

**==> picture [165 x 104] intentionally omitted <==**

**----- Start of picture text -----**<br>
VOUT = VADJ<br>10%<br>0.9* VADJ<br>< ><br>7 1 , 1ms oe - 1ms > + | Oo 100ms<br>p e ++ _<br>oa open eda closed l 70 open 0p 3 closed<br>**----- End of picture text -----**<br>


All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

October 2023/Rev. 1.7 NI PS-26 

8/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## 9. EFFICIENCY AND POWER LOSSES 

|9. EFFICIENCY AND POWER LOSSESFFICIENCY AND POWER LOSSES|EFFICIENCY AND POWER LOSSESFFICIENCY AND POWER LOSSESPOWER LOSSESOWER LOSSESLOSSESOSSES|EFFICIENCY AND POWER LOSSESFFICIENCY AND POWER LOSSESPOWER LOSSESOWER LOSSESLOSSESOSSES||||
|---|---|---|---|---|---|
|||**AC 100 V**|**AC 120 V**|**AC 230 V**||
|Efficiency|Typ.|92.9%|93.6%|95.2%|At 24 V,10 A|
||Typ.|92.5%|93.4%|95.1%|At 24 V, 12 A(PowerBoost)|
|Average efficiency*)|Typ.|92.5%|93.0%|94.3%|25% at 2.5 A, 25% at 5 A,|
||||||25% at 7.5 A. 25% at 10 A|
|Power losses|Typ.|2.5 W|2.1 W|1.8 W|At 24 V, 0 A|
||Typ.|9.8 W|8.9 W|7.1 W|At 24 V, 5 A|
||Typ.|18.3 W|16.4 W|12.1 W|At 24 V, 10 A|
||Typ.|23.4 W|21.7 W|14.8 W|At 24 V, 12 A(PowerBoost)|



*) The average efficiency is an assumption for a typical application where the power supply is loaded with 25% of the nominal load for 25% of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time, and with 100% of the nominal load for the rest of the time. 

**==> picture [173 x 125] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 9-1    Efficiency vs. output current at 24 V, typ.<br>Efficiency<br>96%<br>op<br>95<br>> ee ee<br>94 HAA tot tt ttt<br>7\ 1 Pl<br>93 Sz ror _L_______or fT Jl<br>92 ieeeee ee eee|  (a) 100Vac  (b) 120Vac |<br> (c)  230Vac<br>91<br>IjJo-to-tofo-boL_e rot | Output Current bot |<br>90<br>2 3 4 5 6 7 8 9 10 11 12A<br>(c)<br>(b)<br>(a)<br>**----- End of picture text -----**<br>


**==> picture [170 x 124] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 9-2    Losses vs. output current at 24 V, typ.<br>Power Losses<br>30W<br>TOPeeAT TAT  (a) 100Vac TO TOPftotd  a<br>25 Tr Ta  (b) 120Vac  (c)  230Vac TIT<br>20 joL sot tot ti | Aa<br>e eee ee |<br>15 ee Port ee ee Tr ee 4 7|<br>10 tL ||  iL <i roy ai ot td<br>5<br>: ee<br>Output Current<br>0<br>0 1 2 3 4 5 6 7 8 9 10 11 12A<br>(a)<br>(b)<br>(c)<br>**----- End of picture text -----**<br>


Fig. 9-3 **Efficiency vs. input voltage at 24 V, 10 A, typ.** 

Fig. 9-4 **Losses vs. input voltage at 24 V, 10 A, typ.** 

**==> picture [335 x 111] intentionally omitted <==**

**----- Start of picture text -----**<br>
Efficiency Power Losses<br>96% 22W<br>i es TOTTT<br>| | |<br>95 20<br>rr i rn TOTTT<br>94 ee ee | 18 No—~to—~to<br>93 wi 16 a<br>| | | ro<br>92 a 14<br>a ] | | I |<br>91 12<br>t—{-----4----4---1 | ' | t—t——~~— |<br>Input Voltage<br>90 10<br>100 120 180 230 264Vac 100 120<br>**----- End of picture text -----**<br>


**==> picture [174 x 111] intentionally omitted <==**

**----- Start of picture text -----**<br>
Power Losses<br>22W<br>TOTTT<br>| | |<br>20<br>TOTTT<br>18 No—~to—~to te<br>16 a<br>ro | |<br>14<br>I | ]<br>12<br>t—t——~~— | —1——-=>s —L<br>Input Voltage<br>10<br>100 120 180 230 264Vac<br>**----- End of picture text -----**<br>


## 10.LIFETIME EXPECTANCY 

The Lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years (131,400 h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices. 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

October 2023/Rev. 1.7 NI PS-26 

9/23 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## NI PS-26 

||**AC 100 V**|**AC 120 V**|**AC 230 V**||
|---|---|---|---|---|
|Lifetime expectancy|128,000 h|141,000 h|176,000 h|At 24 V, 5 A and 40 °C|
||61,000 h|75,000 h|120,000 h|At 24 V, 10 A and 40 °C|
||47,000 h|59,000 h|101,000 h|At 24 V, 12 A and 40 °C|
||363,000 h|399,000 h|499,000 h|At 24 V, 5 A and 25 °C|
||173,000 h|211,000 h|338,000 h|At 24 V, 10 A and 25 °C|
||132,000 h|166,000 h|286,000 h|At 24 V, 12 A and 25 °C|



## 11.MTBF 

MTBF stands for **M** ean **T** ime **B** etween **F** ailure, which is calculated according to statistical device failures and indicates reliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product. 

The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of, for example, 1,000,000 h means that statistically one unit will fail every 100 hours if 10,000 units are installed in the field. However, it cannot be determined if the failed unit has been running for 50,000 h or only for 100 h. 

For these types of units the MTTF ( **M** ean **T** ime **T** o **F** ailure) value is the same value as the MTBF value. 

**AC 100 V AC 120 V AC 230 V** MTBF SN 29500, IEC 61709 550,000 h 560,000 h 661,000 h At 24 V, 10 A and 40 °C 1,003,000 h 1,017,000 h 1,176,000 h At 24 V, 10 A and 25 °C MTBF MIL HDBK 217F 188,000 h 188,000 h 213,000 h At 24 V, 10 A and 40 °C; Ground Benign GB40 252,000 h 252,000 h 290,000 h At 24 V, 10 A and 25 °C; Ground Benign GB25 40,000 h 40,000 h 47,000 h At 24 V, 10 A and 40 °C; Ground Fixed GF40 51,000 h 51,000 h 61,000 h At 24 V, 10 A and 25 °C; Ground Fixed GF25 12.TERMINALS AND WIRING The terminals are IP20 Finger safe constructed and suitable for field- and factory wiring. **NI PS-26 Input Output DC-OK-Signal** Type Quick-connect spring-clamp Quick-connect springPush-in terminal terminal clamp terminal Solid wire Max. 6 mm[2] Max. 6 mm[2] Max. 1.5 mm[2] Stranded wire Max. 4 mm[2] Max. 4 mm[2] Max. 1.5 mm[2] American Wire Gauge AWG 20-10 AWG 20-10 AWG 24-16 Max. wire diameter (including ferrules) 2.8 mm 2.8 mm 1.6 mm Wire stripping length 10 mm 10 mm 7 mm Screwdriver - - 3 mm slotted to open the spring October 2023/Rev. 1.7 NI PS-26 All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 10/23 ~~oo~~ 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## **Instructions for wiring:** 

- a) Use appropriate copper cables that are designed for minimum operating temperatures of: 60 °C for ambient up to 45 °C and 

   - 75 °C for ambient up to 60 °C and 

   - 90 °C for ambient up to 70 °C minimum. 

- b) Follow national installation codes and installation regulations! 

- c) Ensure that all strands of a stranded wire enter the terminal connection! 

- d) Unused terminal compartments should be securely tightened. 

- e) Ferrules are allowed. 

## **Daisy chaining:** 

Daisy chaining is allowed for the NI PS-26. 

Daisy chaining (jumping from one power supply output to the next) is allowed as long as the average output current through one terminal pin does not exceed 25 A. If the current is higher, use a separate distribution terminal block as shown in Fig. 12-2. 

**==> picture [366 x 102] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 12-1   Daisy chaining of outputs  Fig. 12-2   Using distribution terminals<br>Power Power<br>Supply Supply Power Power<br>Supply Supply<br>+  + -  - +  + -  - Load<br>Output Output + - +  + -  - -  - +  + -  - -  -<br>Output Output<br>max 25A!<br>continuous<br>**----- End of picture text -----**<br>


**==> picture [144 x 56] intentionally omitted <==**

**----- Start of picture text -----**<br>
Distribution<br>Terminals<br>Power Power<br>Supply Supply<br>+  + -  - -  - +  + -  - -  - Load<br>Output Output + -<br>**----- End of picture text -----**<br>


## 13.FUNCTIONAL DIAGRAM 

**==> picture [88 x 7] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 13-1    Functional diagram<br>**----- End of picture text -----**<br>


**==> picture [334 x 106] intentionally omitted <==**

**----- Start of picture text -----**<br>
L +<br>Input Fuse +<br>N Input FilterInput RectifierInrush Current Limiter ConverterPFC ConverterPower OutputFilter -<br>-<br>-<br>© : Output 1<br>RegulatorVoltage VOUT<br>Temper-downatureShut- ManagerOutputPower ProtectionVoltageOutputOver- MonitorVoltageOutput _ DC-ok re DC-okLEDDC-ok<br>Relay Contact<br>**----- End of picture text -----**<br>


October 2023/Rev. 1.7 NI PS-26 

11/23 || 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

## NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## 14.FRONT SIDE AND USER ELEMENTS 

## **A Output Terminals** 

(two identical + poles and three identical - poles) Spring-clamp terminals 

**+** Positive output 

**–** Negative (return) output 

## **B Output voltage potentiometer** 

Open the flap to adjust the output voltage. Factory set: 24.1 V 

## **C DC-OK LED** (green) 

On, when the output voltage is in range and the DC-OK contact is closed. 

~~_—~~ **D DC-OK Relay Contact** (push-in terminals) Monitors the output voltage of the running power supply. See section 8 for details. 

**E Input Terminals** 

Spring-clamp terminals **N, L** Line input PE (Protective Earth) input 

## 15.EMC 

The power supply is suitable for applications in industrial environment as well as in residential, commercial, and light industry environments. 

|**EMC Immunity**|Accordingtogeneric standards: EN 61000-6-1 and EN 61000-6-2|eneric standards: EN 61000-6-1 and EN 61000-6-2|eneric standards: EN 61000-6-1 and EN 61000-6-2||
|---|---|---|---|---|
|Electrostatic discharge|EN 61000-4-2|Contact discharge|8 kV|Criterion A|
|||Air discharge|15 kV|Criterion A|
|Electromagnetic RF field|EN 61000-4-3|80 MHz-2.7 GHz|20 V/m|Criterion A|
|Fast transients (Burst)|EN 61000-4-4|Input lines|4 kV|Criterion A|
|||Output lines|2 kV|Criterion A|
|||DC-OK signal(couplingclamp)|2 kV|Criterion A|
|Surge voltage on input|EN 61000-4-5|LN|2 kV|Criterion A|
|||LPE, NPE|4 kV|Criterion A|
|Surge voltage on output|EN 61000-4-5|+-|1 kV|Criterion A|
|||+ / -PE|2 kV|Criterion A|
|Surge voltage on Signals|EN 61000-4-5|DC-OK signalPE|1 kV|Criterion A|
|Conducted disturbance|EN 61000-4-6|0.15-80 MHz|20 V|Criterion A|
|Mains voltage dips|EN 61000-4-11|0% of 100 Vac|0 Vac, 20 ms|Criterion A|
|||40% of 100 Vac|40 Vac, 200 ms|Criterion C|
|||70% of 100 Vac|70 Vac, 500 ms|Criterion C|
|||0% of 200 Vac|0 Vac, 20 ms|Criterion A|
|||40% of 200 Vac|80 Vac, 200 ms|Criterion A|
|||70% of 200 Vac|140 Vac, 500 ms|Criterion A|
|Voltage interruptions|EN 61000-4-11|0% of 200 Vac(= 0V)|5000 ms|Criterion C|



October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

12/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

|Voltage sags|SEMI F47|Dips on the input voltage according to SEMI F47 standard|Dips on the input voltage according to SEMI F47 standard||
|---|---|---|---|---|
|||80% of 120 Vac (96 Vac)|1000 ms|Criterion A|
|||70% of 120 Vac (84 Vac)|500 ms|Criterion A|
|||50% of 120 Vac(60 Vac)|200 ms|Criterion A|
|Powerful transients|VDE 0160|Over entire load range|750 V,0.3 ms|Criterion A|



**Criteria: A:** Power supply shows normal operation behavior within the defined limits. 

**C:** Temporary loss of function is possible. Power supply may shut-down and restarts by itself. No damage or hazards for the power supply will occur. 

|**EMC Emission**|Accordingtogeneric standards: EN 61000-6-3 and EN 61000-6-4|eneric standards: EN 61000-6-3 and EN 61000-6-4|
|---|---|---|
|Conducted emission|EN 55011, EN 55015, EN 55032, FCC Part 15,|Class B|
|input lines|CISPR 11, CISPR 32||
|Conducted emission|IEC/CISPR 16-1-2, IEC/CISPR 16-2-1|Limits for DC power port according EN 61000-6-3|
|output lines2)||fulfilled|
|Radiated emission|EN 55011, EN 55032|Class B|
|Harmonic input current|EN 61000-3-2|Class A fulfilled between 0 A and 12 A load|
|||Class C fulfilled between 6 A and 12 A load|
|Voltage fluctuations,flicker|EN 61000-3-3|Fulfilled1)|



This device complies with FCC Part 15 rules. 

Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. 

1) Tested with constant current loads, non pulsing 

2) For information only, not mandatory for EN 61000-6-3 

|**Switching Frequencies**||||
|---|---|---|---|
|PFC converter|110 kHz|Fixed frequency||
|Main converter|84 kHz to 140 kHz|Output load dependent||
|Auxiliaryconverter|60 kHz|Fixed frequency||
|16. ENVIRONMENT||||
|Operational temperature1)|-25 °C to +70 °C||Reduce output power according to Fig. 16-1|
|Storage temperature|-40 °C to +85 °C||For storage and transportation|
|Output derating|6 W/K||Between +60 °C and +70 °C|
|Humidity|5 to 95% r.h.||According to IEC 60068-2-30|
||||Do not energize while condensation ispresent.|
|Vibration sinusoidal2)|2-17.8 Hz: ±1.6 mm; 17.8-500 Hz: 2 g||According to IEC 60068-2-6|
||2 hours/axis|||
|Shock2)|30 g 6 ms, 20 g 11 ms||According to IEC 60068-2-27|
||3 bumps/direction,18 bum|18 bumps in total||
|Altitude|0 to 2000 m||Without any restrictions|
||2000 to 6000 m||Reduce output power or ambient temperature, see|
||||Fig. 16-2.|
|Altitude derating|15 W/1000 m or 5 K/1000 m||For altitudes >2000 m,see Fig. 16-2|
|Over-voltage category|III||According to IEC 62477-1 for altitudes up to 2000 m|
||II||According to IEC 62477-1 for altitudes from 2000 m to|
||||6000 m|



## 16.ENVIRONMENT 

## October 2023/Rev. 1.7 NI PS-26 

October 2023/Rev. 1.7 NI PS-26 All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 13/23 | 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

Degree of pollution 2 According to IEC 62477-1, not conductive Audible noise Some audible noise may be emitted from the power supply during no load, overload, or short circuit. 1) Operational temperature is the same as the ambient or surrounding temperature and is defined as the air temperature 2 cm below the unit. 2) Tested in combination with DIN rails according to EN 60715 with a height of 15 mm and a thickness of 1.3 mm and standard orientation. 

**==> picture [490 x 144] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 16-1    Output current vs. ambient temp.   Fig. 16-2    Output current vs. altitude<br>(Inom 10 A; Iout with PowerBoost = 12 A)<br>Allowed Output Current at 24V Allowed Output Current at 24V<br>12A B 12A<br>|| A |<br>10A 10A<br>8A | | l | 8A | _——<br>6A ||l l 6A | |<br>4A a 4A = to<br>l l |<br>2A A... 85 to 264Vac, continuous B... short term : _ L_ | 2A _ 1 to | |<br>0 0<br>-25 0 20 40 60 70°C 0 2000m 4000m 6000m<br>Ambient Temperature Altitude<br>D<br>C<br>B<br>A<br>A... Tamb < 60°C<br>B... Tamb < 50°C<br>C... Tamb < 40°C<br>D... Short term<br>**----- End of picture text -----**<br>


## 17.PROTECTION FEATURES 

|Output protection|Electronically protected against overload, no-load and short-circuits. In case of a protection|Electronically protected against overload, no-load and short-circuits. In case of a protection|
|---|---|---|
||event, audible noise mayoccur.|occur.|
|Output over-voltage protection|Typ. 30.5 Vdc|In case of an internal power supply defect, a redundant circuit|
||Max. 32 Vdc|limits the maximum output voltage. The output shuts down and|
|||automaticallyattempts to restart.|
|Degree of protection|IP 20|EN/IEC 60529|
|Penetrationprotection|> 4 mm|For example, screws, smallparts|
|Over-temperature protection|Yes|Output shut-down with automatic restart.|
|||The temperature sensor is installed on critical components|
|||inside the unit and turns the unit off in safety critical situations,|
|||which can happen, for example, when derating requirements|
|||are not observed, ambient temperature is too high, ventilation|
|||is obstructed, or the derating requirements for different|
|||mounting orientation is not followed. There is no correlation|
|||between the operating temperature and turn-off temperature,|
|||because this is dependent on input voltage, load, and|
|||installation methods.|
|Input transient protection|MOV|For protection values see section 15 (EMC).|
||(Metal Oxide Varistor)||
|Internal input fuse|Included|Not user replaceable slow-blow high-brakingcapacityfuse|



## 18.SAFETY FEATURES 

|18.SAFETY FEATURES SAFETY FEATURESAFETY FEATURESFEATURESEATURES||||||
|---|---|---|---|---|---|
|Input / output separation|Double or reinforced galvanic isolation|Double or reinforced galvanic isolation||||
||SELV|IEC/EN 60950-1|IEC/EN 60950-1|||
||PELV|IEC/EN 60204-1, EN 62477-1, IEC 60364-4-41|IEC/EN 60204-1, EN 62477-1, IEC 60364-4-41|IEC/EN 60204-1, EN 62477-1, IEC 60364-4-41|IEC/EN 60204-1, EN 62477-1, IEC 60364-4-41|



## October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

14/23 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## NI PS-26 

|Class ofprotection|I|PE(Protective Earth)connection required|
|---|---|---|
|Isolation resistance|> 500 MOhm|At delivered condition between input and output, measured|
|||with 500 Vdc|
||> 500 MOhm|At delivered condition between input and PE, measured with|
|||500 Vdc|
||> 500 MOhm|At delivered condition between output and PE, measured with|
|||500 Vdc|
||> 500 MOhm|At delivered condition between output and DC-OK contacts,|
|||measured with 500 Vdc|
|PE resistance|< 0.1 Ohm|Resistance between PE terminal and the housing in the area of|
|||the DIN rail mountingbracket.|
|Touch current (leakage current)|Typ. 0.14 mA/0.36 mA|At 100 Vac, 50 Hz, TN-, TT-mains/IT-mains|
||Typ. 0.20 mA/0.50 mA|At 120 Vac, 60 Hz, TN-, TT-mains/IT-mains|
||Typ. 0.33 mA/0.86 mA|At 230 Vac, 50 Hz, TN-, TT-mains/IT-mains|
||Max. 0.18 mA/0.43 mA|At 110 Vac, 50 Hz, TN-, TT-mains/IT-mains|
||Max. 0.26 mA/0.61 mA|At 132 Vac, 60 Hz, TN-, TT-mains/IT-mains|
||Max. 0.44 mA/1.05 mA|At 264 Vac, 50 Hz, TN-, TT-mains/IT-mains|



## 19.DIELECTRIC STRENGTH 

The output voltage is floating and has no ohmic connection to the ground. Type and factory tests are conducted by the manufacturer. Field tests may be conducted in the field using the appropriate test equipment which applies the voltage with a slow ramp (2 s up and 2 s down). Connect all input-terminals together as well as all output poles before conducting the test. When testing, set the cut-off current settings to the value in the table below. 

**==> picture [144 x 116] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 19-1    Dielectric strength<br>Input DC-ok<br>L B [*)] 13<br>N 14<br>NS<br>D<br>A<br>Earth, PE \ Output<br>C +<br>—<br>-<br>B<br>**----- End of picture text -----**<br>


|~~ee~~|**A**<br>~~ee~~|**B**<br>~~ee~~|**C**<br>~~ee~~|**D**|
|---|---|---|---|---|
|60 s<br>~~ee~~|2500 Vac<br>~~ee~~|4000 Vac<br>~~ee~~|1000 Vac<br>~~ee~~|500 Vac|
|5 s<br>~~ee~~<br>~~ee~~|2500 Vac<br>~~ee~~<br>~~ee~~|2500 Vac<br>~~ee~~<br>~~ee~~|500 Vac<br>~~ee~~<br>~~ee~~|500 Vac<br>~~ee~~|
|5 s<br>~~ee~~|2000 Vac<br>~~ee~~|2000 Vac<br>~~ee~~|500 Vac<br>~~ee~~|500 Vac<br>~~ee~~|
||> 10 mA<br>~~ee~~|> 10 mA<br>~~ee~~|> 20 mA<br>~~ee~~|> 1 mA<br>~~ee~~|



To fulfil the PELV requirements according to EN60204-1 § 6.4.1, we recommend that either the + pole, the – pole, or any other part of the output circuit shall be connected to the protective earth system. This helps to avoid situations in which a load starts unexpectedly or cannot be switched off when unnoticed earth faults occur. 

B*) When testing input to DC-OK ensure that the max. voltage between DC-OK and the output is not exceeded (column D). We recommend connecting DC-OK pins and the output pins together when performing the test. 

## 20.APPROVED, FULFILLED OR TESTED STANDARDS 

|20.APPROVED, APPROVED,PPROVED,, FULFILLED OR TESTED STANDARDSULFILLED OR TESTED STANDARDS|FULFILLED OR TESTED STANDARDSULFILLED OR TESTED STANDARDSTESTED STANDARDSESTED STANDARDSSTANDARDSTANDARDS|
|---|---|
|UL 508|UL Certificate|
||Listed equipment for category NMTR - Industrial Control Equipment|
||Applicable for US and Canada|
||E-File: E330187|
|Class 1 Div 2|UL Certificate|
||Listed equipment for category NRAD - Listed equipment Industrial|
||Control Equipment for Use in Hazardous Locations|
||Applicable for US and Canada|
||E-File: E536050|
||Temperature Code: T4|
||Groups: A, B, C and D|



## October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

15/23 pe 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

|IEC 61558-2-16|||Test Certificate|
|---|---|---|---|
||||IEC 61558-2-16 - Safety of transformers, reactors, power supply units|
||Safetyy||and similar products for supply voltages up to 1100 V|
||||Particular requirements and tests for switch mode power supply units|
||||and transformers for switch modepower supplyunits|
|SEMI 47|||Test Report|
||SEMI F47||Voltage Sag Immunity for Semiconductor Processing Equipment<br>Tested for AC 208 V L-L or L-N mains voltages, nominal output voltage|
||||and nominal output load|
|IEC 60068-2-60|||Manufacturer's Declaration (Online Document)|
||||Environmental Tests, Flowing Mixed Gas Corrosion Test|
||||IEC 60068-2-60 Method 4|
||Corrosion||Test Ke - Method 4|
||||H2S: 10 ppb|
||||NO2: 200 ppb|
||||Cl2: 10 ppb|
||||SO2: 200 ppb|
||||Test Duration: 3 weeks,this simulates a service life of 10years|
|ISA-71.04 G3|||Manufacturer's Declaration (Online Document)|
||||Airborne Contaminants Corrosion Test|
||||ISA-71.04 G3|
||c<br>.<br>G3.sa71.04V||Severity Level: G3 Harsh<br>H2S: 100 ppb<br>NOx: 1250  ppb|
||||Cl2: 20ppb|
||||SO2: 300 ppb|
||||Test Duration: 3 weeks, this simulates a service life of 10years|
|Labs|LABS||Paint Wetting Impairment Substances Test (or LABS-Test)<br>Tested for Zone 2 and test class C1 according to VDMA 24364-C1-L/W|
||||for solvents and water-basedpaints|
|21. REGULATORYPRODUCTCOMPLIANCE||||
|EU Declaration of Conformity|||The CE mark indicates conformance with the|
||||- EMC directive|
||||- Low voltage directive|
||||- RoHS directive|
|REACH Regulation (EU)|||Manufacturer's Declaration|
||REACHY|Y|EU regulation regarding the Registration, Evaluation, Authorisation,<br>and Restriction of Chemicals (REACH) fulfilled.|
||||EU Regulation(EC)1907/2006.|
|WEEE Regulation|||Manufacturer's Declaration|
||x||EU Regulation on Waste Electrical and Electronic Equipment<br>Registered as business to business (B2B) products.|
||||EU Regulation 2012/19/EU|
|UKCA|||UKCA Declaration of Conformity|
||UK||Trade conformity assessment for England, Scotland, and Wales<br>The UKCA mark indicates conformity with the UK Statutory Instruments|
||CA||2016 No.1101,|
||||2016 No.1091,|
||||2012 No.3032|



## 21.REGULATORY PRODUCT COMPLIANCE 

## October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

16/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## 22.PHYSICAL DIMENSIONS AND WEIGHT 

Width 39 mm Height 124 mm Depth 117 mm The DIN rail depth must be added to the unit depth to calculate the total required installation depth. Weight 600 g DIN rail Use 35 mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15 mm. Housing material Body: Aluminium alloy Cover: Zinc-plated steel Installation clearances See section 2 

**==> picture [231 x 229] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 22-1 Fig. 22-3<br>Front view  Side view<br>3.5 32<br>peo<br>24-28v (CL)<br>DC ok ©<br>or \ feel x<br>Input<br>NLPE<br>39 DIN-Rail depth<br>All dimensions in mm All dimensions in mm<br>**----- End of picture text -----**<br>


## 23.ACCESSORIES 

## 23.1. SIDE MOUNTING BRACKET—139683-01 

This bracket is used to mount the power supply sideways with or without using a DIN rail. 

The two aluminum brackets and the black plastic slider of the unit have to be detached, so that the steel brackets can be mounted. 

[Bl can be mounted. B: For sideway DIN rail mounting, the removed aluminum brackets and the black plastic slider need to be mounted on the steel bracket. ) CecA |Y> 

October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

17/23 

NI PS-26 

**==> picture [177 x 10] intentionally omitted <==**

**----- Start of picture text -----**<br>
24 V, 10 A, 240 W, SINGLE PHASE INPUT<br>**----- End of picture text -----**<br>


**==> picture [399 x 24] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 23-1  Fig. 23-2 Fig. 23-3<br>Side mounting without DIN rail  Side mounting with DIN rail  Mounting Dimensions<br>brackets  brackets  Side mounting bracket<br>**----- End of picture text -----**<br>


## 24.APPLICATION NOTES 

## 24.1. PEAK CURRENT CAPABILITY 

The unit can deliver peak currents (up to several milliseconds) which are higher than the specified short term currents. 

This helps to start current demanding loads. Solenoids, contactors and pneumatic modules often have a steady state coil and a pick-up coil. The inrush current demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal output current (including the PowerBoost). The same situation applies when starting a capacitive load. 

The peak current capability also ensures the safe operation of subsequent circuit breakers of load circuits. The load branches are often individually protected with circuit breakers or fuses. In case of a short or an overload in one branch circuit, the fuse or circuit breaker need a certain amount of over-current to open in a timely manner. This avoids voltage loss in adjacent circuits. 

The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of the power supply. The capacitors get discharged during such an event, which causes a voltage dip on the output. The following two examples show typical voltage dips for resistive loads: 

**==> picture [128 x 15] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 24-1    20 A peak current for 50 ms , typ.<br>(2x the nominal current)<br>**----- End of picture text -----**<br>


**==> picture [125 x 15] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 24-2    50 A peak current for 5 ms , typ.<br>(5x the nominal current)<br>**----- End of picture text -----**<br>


All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

October 2023/Rev. 1.7 NI PS-26 

18/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

Fig. 24-3 **30 A peak current for 12 ms , typ. (3x the nominal current)** 

Please note: The DC-OK relay triggers when the voltage dips more than 10% for longer than 1 ms. 

Peak current voltage dips Typically from 24 V to 17 V At 20 A for 50 ms, resistive load Typically from 24 V to 19 V At 50 A for 2 ms, resistive load Typically from 24 V to 15.5 V At 50 A for 5 ms, resistive load 

## 24.2. BACK-FEEDING LOADS 

Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force). 

This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply. It does not matter whether the power supply is on or off. 

The maximum allowed feed-back-voltage is 35 Vdc. The maximum allowed feed-back peak current is 40 A. Higher currents can temporarily shut-down the output voltage. The absorbing energy can be calculated according to the built-in large sized output capacitor which is specified in section 6. 

## 24.3. EXTERNAL INPUT PROTECTION 

The unit is tested and approved for branch circuits up to 30 A (UL) and 32 A (IEC). An external protection is only required if the supplying branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local regulations might apply. 

If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of the circuit breaker. A minimum value of 6A B- or C-Characteristic breaker should be used. 

## 24.4. OUTPUT CIRCUIT BREAKERS 

Standard miniature circuit breakers (MCB’s or UL 1077 circuit breakers) are commonly used for AC-supply systems and may also be used on 24 V branches. 

MCB’s are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to the wire size that is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not. 

To avoid voltage dips and under-voltage situations in adjacent 24 V branches which are supplied by the same source, a fast (magnetic) tripping of the MCB is desired. A quick shutdown within 10 ms is necessary corresponding roughly to the ride-through time of PLCs. This requires power supplies with high current reserves and large output capacitors. Furthermore, the impedance of the faulty branch must be sufficiently small for the current to actually flow. The best current reserve in the power supply does not help if Ohm’s law does not 

October 2023/Rev. 1.7 NI PS-26 

19/23 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

|permit current flow. The following table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending|permit current flow. The following table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending|
|---|---|
|on the wire cross section and wire length.||
|Fig. 24-4**Test circuit**<br>Maximal wire length<br>*for a fast (magnetic) tripping:||
|MCB<br>Power Supply<br>AC<br>DC<br>+<br>~~-~~<br>+<br>-<br>Load<br>Wire length<br>S1... Fault simulation switch<br>S1<br>**0.75 mm²**<br>**1.0 mm²**<br>**1.5 mm²**<br>**2.5 mm²**<br>**C-2A**<br>30 m<br>37 m<br>54 m<br>84 m<br>**C-3A**<br>25 m<br>30 m<br>46 m<br>69 m<br>**C-4A**<br>9 m<br>15 m<br>25 m<br>34 m<br>**C-6A**<br>3 m<br>3 m<br>4 m<br>7 m<br>**C-8A**<br>**B-6A**<br>12 m<br>15 m<br>21 m<br>34 m<br>**B-10A**<br>3 m<br>3 m<br>4 m<br>9 m<br>**B-13A**<br>2 m<br>2 m<br>3 m<br>6 m<br>*<br>Don’t forget to consider twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire).<br>~~nest] S====~~||



**==> picture [501 x 355] intentionally omitted <==**

**----- Start of picture text -----**<br>
Unit A<br>24.5. SERIES OPERATION<br>AC<br>+<br>Power supplies of the same type can be connected in series for higher output voltages.<br>It is possible to connect as many units in series as needed, providing the sum of the  DC -<br>output voltage does not exceed 150 Vdc. Voltages with a potential above 60 Vdc are not  +<br>SELV anymore and can be dangerous. Such voltages must be installed with a protection  Unit B Load<br>against touching.   AC + -<br>Earthing of the output is required when the sum of the output voltage is above 60 Vdc.   -<br>Avoid return voltage (for example, from a decelerating motor or battery) which is  DC Earth<br>t a (see notes)<br>applied to the output terminals.<br>Restrictions:<br>Keep an installation clearance of 15 mm (left/right) between two power supplies and avoid installing the power supplies on top of each<br>other.<br>Do not use power supplies in series in mounting orientations other than the standard mounting orientation (terminals on bottom of the<br>unit).<br>Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.<br>24.6. PARALLEL USE TO INCREASE OUTPUT POWER<br>NI PS-26 power supplies can be paralleled to increase the output power. The output  Unit A<br>voltage of all power supplies shall be adjusted to the same value (±100 mV) with the same  AC +<br>load conditions on all units, or the units can be left with the factory settings. There is no<br>feature included which balances the load current between the power supplies. Usually the  DC -<br>power supply with the higher adjusted output voltage draws current until it goes into  +<br>current limitation. This means no harm to this power supply as long as the ambient  Unit B Load<br>temperature stays below 40 °C.  AC<br>+ -<br>If more than three units are connected in parallel, a fuse or circuit breaker with a rating of<br>15 A or 16 A is required on each output. Alternatively, a diode or redundancy module can  DC -<br>also be utilized.  ios<br>**----- End of picture text -----**<br>


Energize all units at the same time to avoid the overload Hiccup _[PLUS]_ mode. It also might be necessary to cycle the input power (turn-off for at least five seconds) if the output was in Hiccup _[PLUS]_ mode due to overload or short circuits and the required output current is higher than the current of one unit. 

October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

20/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

## Restrictions: 

Keep an installation clearance of 15 mm (left/right) between two power supplies and avoid installing the power supplies on top of each other. 

Do not use power supplies in parallel in mounting orientations other than the standard mounting orientation (terminals on bottom of the unit) or in any other condition where a derating of the output current is required (for example, altitude). 

Pay attention that leakage current, EMI, inrush current, and harmonics will increase when using multiple power supplies. 

## 24.7. PARALLEL USE FOR REDUNDANCY 

## **1+1 Redundancy:** 

Power supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require a certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one is automatically able to support the load current without any interruption. It is possible that the defective unit will become a load of another power supply while configured in parallel usage. Recommendations for building redundant power systems: 

- Use separate input fuses for each power supply. 

- Monitor the individual power supply units. Therefore, use the DC-OK relay contact of the power supply. 

- It is desirable to set the output voltages of all units to the same value (± 100 mV) or leave it at the factory setting. 

Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies. 

## **N+1 Redundancy:** 

Redundant systems for a higher power demand are usually built in a N+1 method. For example, four power supplies, each rated for 10 A are paralleled to build a 30 A redundant system. 

Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies. 

Keep an installation clearance of 15 mm (left/right) between two power supplies and avoid installing the power supplies on top of each other. 

Do not use power supplies in parallel in mounting orientations other than the standard mounting orientation or in any other condition, where a derating of the output current is required. 

## Inductive and Capacitive Loads 

The unit is designed to supply any kind of loads, including capacitive and inductive loads. If extreme large capacitors, such as EDLCs (electric double layer capacitors or “UltraCaps”) with a capacitance larger than 1.5 F are connected to the output, the unit might charge the capacitor in the Hiccup _[PLUS]_ mode (see section 6). 

## 24.8. CHARGING OF BATTERIES 

The power supply can be used to charge lead-acid or maintenance free batteries (SLA or VRLA batteries). Two 12 V batteries are needed in series. 

## **Instructions for charging batteries:** 

- a) Ensure that the ambient temperature of the power supply stays below 40 °C for mains voltage of AC 120 V or higher and 35 °C for a mains voltage of AC 100 V. 

- b) Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge voltage. 

|End-of-charge voltage|27.8 V|27.5 V|27.15 V|26.8 V|
|---|---|---|---|---|
|Battery temperature|10 °C|20 °C|30 °C|40 °C|



- c) Use a 15 A or 16 A circuit breaker (or blocking diode) between the power supply and the battery. 

- d) Ensure that the output current of the power supply is below the allowed charging current of the battery. 

## October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

21/23 fe 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

- e) Use only matched batteries when putting 12 V types in series. 

- f) The return current to the power supply (battery discharge current is typ. 3.5 mA when the power supply is switched off (except in case a blocking diode is utilized)). 

## 24.9. OPERATION ON TWO PHASES 

**==> picture [481 x 89] intentionally omitted <==**

**----- Start of picture text -----**<br>
Power Supply<br>The power supply can also be used on two-phases of a three-phase-system. Such a  L1 AC<br>phase-to-phase connection is allowed as long as the supplying voltage is below<br>L<br>240 V [+10%] .<br>Center<br>L3 Tap N<br>PE<br>DC<br>24.10. USE IN A TIGHTLY SEALED ENCLOSURE Tr L2<br> max.<br>+10%<br>240V<br>**----- End of picture text -----**<br>


When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher than outside. In such situations, the inside temperature defines the ambient temperature for the power supply. 

The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure. 

The power supply is placed in the middle of the box, no other heat producing items are inside the box. 

The temperature sensor inside the box is placed in the middle of the right side of the power supply with a distance of 1 cm. 

||**Case A**|**Case B**|**Case C**|**Case D**|
|---|---|---|---|---|
|Enclosure size|**110**x 180 x 165 mm|**110**x 180 x 165 mm|**180**x 180 x 165 mm|**180**x 180 x 165 mm|
||Rittal Typ IP66 Box|Rittal Typ IP66 Box|Rittal Typ IP66 Box|Rittal Typ IP66 Box|
||PK 9516 100,|PK 9516 100,|PK 9519 100,|PK 9519 100,|
||plastic|plastic|plastic|plastic|
|Input voltage|230 Vac|230 Vac|230 Vac|230 Vac|
|Load|24 V, 8 A;(=**80%**)|24 V, 10 A;(=**100%**)|24 V, 8 A;(=**80%**)|24 V, 10 A;(=**100%**)|
|Temperature inside the box|48.6 °C|53.8 °C|42.0 °C|48.1 °C|
|Temperature outside the box|26.3 °C|26.6 °C|25.8 °C|26.2 °C|
|Temperature rise|22.3 K|27.3 K|16.2 K|21.9 K|



## 24.11. MOUNTING ORIENTATIONS 

Mounting orientations other than all terminals on the bottom require a reduction in continuous output power or a limitation in the maximum allowed ambient temperature. The amount of reduction influences the lifetime expectancy of the power supply. Therefore, two different derating curves for continuous operation can be found below: 

**Curve A1** Recommended output current. 

**Curve A2** Max allowed output current (results in approximately half the lifetime expectancy of A1). 

**==> picture [360 x 84] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 24-5 Output Current<br>Mounting  OUTPUT 12A<br>Orientation A<br>(Standard  9<br>orientation) Power<br>Supply 6<br>3<br>Ambient Temperature<br>INPUT 0<br>10 20 30 40 50 60°C<br>A1<br>**----- End of picture text -----**<br>


October 2023/Rev. 1.7 NI PS-26 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted. 

22/23 

NI PS-26 

24 V, 10 A, 240 W, SINGLE PHASE INPUT 

**==> picture [360 x 387] intentionally omitted <==**

**----- Start of picture text -----**<br>
Fig. 24-6 Output Current<br>Mounting  12A<br>Orientation B<br>(Upside down) 9<br>6<br>3<br>Ambient Temperature<br>0<br>10 20 30 40 50 60°C<br>Fig. 24-7 Output Current<br>Mounting  12A<br>Orientation C<br>(Table-top  9<br>mounting)<br>6<br>3<br>Ambient Temperature<br>0<br>10 20 30 40 50 60°C<br>Fig. 24-8 Output Current<br>Mounting  12A<br>Orientation  D<br>(Horizontal cw) 9<br>6<br>3<br>Ambient Temperature<br>0<br>10 20 30 40 50 60°C<br>Fig. 24-9 Output Current<br>Mounting  12A<br>Orientation  E<br>(Horizontal ccw) 9<br>6<br>3<br>Ambient Temperature<br>0<br>10 20 30 40 50 60°C<br>A1 A2<br>A1 A2<br>A1 A2<br>A1 A2<br>INPUT Supply Power OUTPUT<br>OUTPUT Power Supply INPUT<br>INPUT<br>Supply<br>Power<br>OUTPUT<br>**----- End of picture text -----**<br>


October 2023/Rev. 1.7 NI PS-26 

23/23 

All values are typical at 24 V, 10 A, 230 Vac, 50 Hz, 25 °C ambient and after a 5 minute run-in time unless otherwise noted.