RTE-B1AF20.

**RTE** 

**Timers** 

~~’~~ 

## **RTE Series — Analog Timers** 

## **Key features:** 

- 20 time ranges and 10 timing functions 

- Time delays up to 600 hours 

- Space-saving package 

- High repeat accuracy of ± 0.2% 

- ON and timing OUT LED indicators 

- Standard 8- or 11-pin and 11-blade termination 

- 2 form C delayed output contacts 

- 10A Contact Rating 

Cert. No. E9950913332316 (EMC, RTE) UL Listed Cert. No. BL960813332355 (LVD, RTE) File No. E66043 @- Cé 

## **General Specifications** 

## **Contact Ratings** 

~~a~~ Operation System | Solid state CMOS Circuit 2 Form C, DPDT Contact Configuration Operation Type | Multi-Mode (Delay output) Time Range | 0.1sec to 600 hours Allowable Voltage / 240V AC, 30V DC / 10A Allowable Current Pollution Degree | 2 (IE60664-1) Maximum Permissible Over voltage category III (IE60664-1) 1800 cycles per hour Operating Frequency | AF20 | 100-240V AC(50/60Hz) Resistive 10A 240V AC, 30V DC Rated Operational Voltage | AD24 | 24V AC(50/60Hz)/24V DC Rated Inductive 7A 240V AC, 30V DC D12 12V DC Load Horse Power AF20 85-264V AC(50/60Hz) 1/6 HP 120V AC, 1/3 HP 240V AC Rating Voltage Tolerance AD24 20.4-26.4V AC(50/60Hz)/21.6-26.4V DC Electrical 500,000 op. minimum (Resistive) | D12 10.8-13.2V DC Life Mechanical 50,000,000 op. minimum Input off Voltage Rated Voltage x10% minimum Ambient Operating Temperature ~~|~~ -20 to +65ºC (without freezing) Ambient Storage and Transport Temperature ~~|~~ -30 to +75ºC (without freezing) Relative Humidity ~~|~~ 35 to 85%RH (without condensation) Atmospheric Pressure ~~|~~ 80kPa to 110kPa (Operating), 70kPa to 110kPa (Transport) Reset Time 100msec maximum ~~|~~ Repeat Error | ±0.2%, ±20msec* Voltage Error | ±0.2%, ±20msec* Temperature Error | ±0.5%, ±20msec* Setting Error | ±10% maximum Insulation Resistance 100MΩ minimum (500V DC) Between power and output terminals: 2000V AC, 1 minute Dielectric Strength Between contacts of different poles: 2000V AC, 1 minute Between contacts of the same pole:1000V AC, 1 minute Vibration Resistance | 10 to 55Hz amplitude 0.5mm[2] hours in each of 3 axes | Operating extremes: 98m/sec[2] (10G) Shock Resistance | Damage limits: 490m/sec[2] (50G) 3 times in each of 3 axes | Degree of Protection | IP40 (enclosure) (IEC60529) | TYPE | RTE-P1, -B1 : RTE-P2, -B2 ~~7~~ Power Consumption oP AF20 120V AC/60Hz | 6.5VA | 6.6VA (Approx.) | ~~|~~ 240V AC/60Hz | 11.6VA | 11.6VA 24V AC 60Hz/DC 3.4VA/1.7W 3.5VA/1.7W D12 1.6W 1.6W Mounting Position Free ~~OS~~ | Dimensions RTE-P1, P2 | 40Hx 36W x 77.9D mm RTE-B1, B2 40Hx 36W x 74.9D mm RTE-P1 RTE-P2 RTE-B1, -B2 *For the value of the error against a preset Weight (Approx.) 87g 89g 85g A time, whichever the largest, applies. 

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**RTE** 

**Timers** 

## **Part Numbering Guide** 

RTE series part numbers are composed of 4 part number codes. When ordering a RTE series part, select one code from each category. Example: **RTE-P1AF20** 

**RTE — P 1 AF20** ~~| LILIL~~ j Series k Terminal l Function m Input Voltage Style Group 

## **Part Numbers: RTE Series** 

||Description|Part Number Code|Remarks|
|---|---|---|---|
|jSeries<br>kTerminal Style<br>lFunction Group<br>mInput Voltage|RTE series<br>Pin<br>Blade<br>ON-delay, interval, cycle OFF, cycle ON<br>ON-delay, cycle OFF, cycle ON, signal ON/<br>OFF delay, OFF-delay, one-shot<br>100 to 240V AC(50/60Hz)<br>24V AC(50/60Hz)/24V DC<br>12V DC|RTE<br>P<br>B<br>1<br>2<br>AF20<br>AD24<br>D12|For internal circuits, see next page.<br>Select one only.<br>Each function group has different timing functions.<br>See page 832.|



## **Part Numbers** 

|Voltage|Power Triggered|Power Triggered|Start Input Triggered|Start Input Triggered|
|---|---|---|---|---|
||8-Pin|Blade|11-Pin|Blade|
|12V DC<br>24V AC/DC<br>100-240V AC|RTE-P1D12<br>RTE-P1AD24<br>RTE-P1AF20|RTE-B1D12<br>RTE-B1AD24<br>RTE-B1AF20|RTE-P2D12<br>RTE-P2AD24<br>RTE-P2AF20|RTE-B2D12<br>RTE-B2AD24<br>RTE-B2AF20|



## **Time Range Determined by Time Range Selector and Dial Selector** 

|~~a~~|Dial<br>~~a~~|0 - 1<br>~~a~~|0 - 3<br>~~a~~|0 - 10<br>~~ae~~|0 - 30<br>~~ae~~|0 - 60<br>~~ae~~|
|---|---|---|---|---|---|---|
|Range<br>~~a~~|Second<br>Minute<br>Hour<br>10 Hours<br>~~a~~|0.1 sec - 1 sec<br>1.2 sec - 1 min<br>1.2 min - 1 hr<br>12 min - 10 hr<br>~~a~~|0.1 sec - 3 sec<br>3.6 sec - 3 min<br>3.6 min - 3 hr<br>36 min - 30 hr<br>~~a ~~|0.2 sec - 10 sec<br>12 sec - 10 min<br>12 min - 10 hr<br>2 hr - 100 hr<br> ~~ae~~|0.6 sec - 30 sec<br>36 sec - 30 min<br>36 min - 30 hr<br>6 hr - 300 hr<br>~~ae~~|1.2 sec - 60 sec<br>1.2 min - 60 min<br>1.2 hr - 60 hr<br>12 hr - 600 hr<br>~~ae~~|



**800-262-IDEC** (4332) • USA & Canada 

837 

**RTE** 

**Timers** 

## **Timing Diagrams** 

## **RTE-P1, -B1** 

**==> picture [224 x 115] intentionally omitted <==**

**----- Start of picture text -----**<br>
RTE-P1 RTE-B1<br>4 5 1 2 3<br>Wrare 3 n 6 4 _ 5 6<br>2 7 7 8 9<br>1 8 A B<br>(~/+) (~/-) AL (~/+) D (~/-)<br>A: ON-Delay 1 (power start)<br>Signaling Lights<br>**----- End of picture text -----**<br>


1. RTE-B1: Do not apply voltage to terminals #2, #5 & #8. 

2. IDEC so ~~cke~~ t ~~s a~~ re as follows: RTE-P1: SR2P-06* pin type socket, RTE-B1: SR3B-05* blade type socket, (*-may be followed by suffix letter A,B,C or U). 

## B: Interval (power start) 

Set timer for desired delay, apply power to coil. Contacts transfer after preset time has elapsed, and remain in transferred position until timer is reset. Reset occurs with removal of power. 

Set timer for desired delay, apply power to coil. Contacts transfer immediately, and return to original position after preset time has elapsed. Reset occurs with removal of power. 

**Item Terminal Number Operation Item Terminal Number Operation** ~~..———<$<—|_—_——_———_—.~~ Power (1) 2 - 7(2) A - B Power (1) 2 - 7(2) A - B Delayed (1) 1 - 4, 5 - 8(2) 1 - 7, 3 - 9 (NC) Delayed (1) 1 - 4, 5 - 8(2) 1 - 7, 3 - 9 (NC) Contact (1) 1 - 3, 6 - 8(2) 4 - 7, 6 - 9 (NO) Contact (1) 1 - 3, 6 - 8(2) 4 - 7, 6 - 9 (NO) PWR PWR Indicator Indicator OUT OUT ~~ee ee==~~ Set Time Set Time **T T** C: Cycle 1 (power start, OFF first) C: Cycle 3 (power start, ON first) 

Functions in same manner as Mode C, with the exception that first transfer of contacts occurs as soon as power is applies. The ratio is 1:1. Time On = Time Off 

Set timer for desired delay, apply power to coil. First transfer of contacts occurs after preset delay has elapsed, after the next elapse of preset delay contacts return to original position. The timer now cycles between on and off as long as power is applied (duty ratio 1:1). 

**Item Terminal Number Operation Item Terminal Number Operation** ~~a~~ Power (1) 2 - 7(2) A - B ~~a~~ Power (1) 2 - 7(2) A - B Delayed (1) 1 - 4, 5 - 8(2) 1 - 7, 3 - 9 (NC) Delayed (1) 1 - 4, 5 - 8(2) 1 - 7, 3 - 9 (NC) Contact (1) 1 - 3, 6 - 8(2) 4 - 7, 6 - 9 (NO) Contact (1) 1 - 3, 6 - 8(2) 4 - 7, 6 - 9 (NO) PWR PWR Indicator Indicator OUT OUT ~~(SSS SESS~~ Set Time Set Time **T T T T** ~~Pe a~~ 

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**RTE** 

**Timers** 

## **Timing Diagrams con’t** 

## **RTE-P2, -B2** 

**==> picture [141 x 76] intentionally omitted <==**

**----- Start of picture text -----**<br>
RTE-P2 RTE-B2<br>externalcontrolsignal start externalcontrolsignal start<br>5 6 7 1 2 3<br>4 8 4 5 6<br>3 9<br>7 8 9<br>2 10<br>1 11 A B<br>(~/+) (~/-) (~/+) (~/-)<br>**----- End of picture text -----**<br>


1. RTE-P2: Do not apply voltage to terminals #5, #6 & #7. 

2. RTE-B2: Do not apply voltage to terminals #2, #5 & #8. 

3. IDEC sockets are as follows: RTE-P2: SR3P-05* pin type socket, RTE-B2: SR3B-05* blade type socket, (*-may be followed by suffix letter A,B,C or U). 

## B: Cycle 2 (signal start, OFF first) 

## A: ON-Delay 2 (signal start) 

|A: ON-Delay 2 (signal start)|A: ON-Delay 2 (signal start)||B: Cycle 2 (signal start, OFF first)|B: Cycle 2 (signal start, OFF first)|B: Cycle 2 (signal start, OFF first)||
|---|---|---|---|---|---|---|
|When a preset time has elapsed after the start input turned on while power is on, the NO output<br>contact goes on.|||When the start input turns on while power is on, the output oscillates at a preset cycle (duty ratio 1:1),<br>starting while the NO contact off.||||
|**Item**<br>**Terminal Number**<br>**Operation**<br>Power<br>(A) 2 - 10<br>(B) A - B<br>Start<br>(A) 5 - 6<br>(B) 2 - 5<br>Delayed<br>Contact<br>(A) 1 - 4, 8 - 11<br>(B) 1 - 7, 3 - 9<br>(NC)<br>(A) 1 - 3, 9 - 11<br>(B) 4 - 7, 6 - 9<br>(NO)<br>Indicator<br>PWR<br>OUT<br>Set Time<br>**T**|||**Item**<br>**Terminal Number**<br>**Operation**<br>Power<br>(A) 2 - 10<br>(B) A - B<br>Start<br>(A) 5 - 6<br>(B) 2 - 5<br>Delayed<br>Contact<br>(A) 1 - 4, 8 - 11<br>(B) 1 - 7, 3 - 9<br>(NC)<br>(A) 1 - 3, 9 - 11<br>(B) 4 - 7, 6 - 9<br>(NO)<br>Indicator<br>PWR<br>OUT<br>Set Time<br>**T**<br>**T**<br>**T**<br>**T**<br>**T**<br>**T**<br>**T**<br>**T**<br>**T**<br>**Ta**<br>~~a|~~<br>~~P|~~<br>~~ll~~<br>~~esos~~<br>~~oe ee~~<br>~~eee eee~~<br>~~ee~~<br>~~ee neeenaenenaeneeneenaeneeneee~~||||
|C: Cycle 4 (signal start, ON first)|||D: Signal ON/OFF-Delay||||
|When the start input turns on while power is on, the NO contact goes on. The output oscillates at a|When the start input turns on while power is on, the NO contact goes on. The output oscillates at a||When the start input turns on while power is on, the NO output contact goes on. When a preset time||||
|preset cycle (duty ratio 1:1).|||has elapsed while the start input remains on, the output contact goes off. When the start input turns||||
|**Item**<br>**Terminal Number**<br>**Operation**<br>Power<br>(A) 2 - 10<br>(B) A - B<br>Start<br>(A) 5 - 6<br>(B) 2 - 5<br>Delayed<br>Contact<br>(A) 1 - 4, 8 - 11<br>(B) 1 - 7, 3 - 9<br>(NC)<br>(A) 1 - 3, 9 - 11<br>(B) 4 - 7, 6 - 9<br>(NO)<br>Indicator<br>PWR<br>OUT<br>Set Time<br>**T**<br>**T**<br>**T**<br>**T**<br>**T**<br>**T**<br>**T**<br>**T**<br>**Ta**<br>E: Signal OFF-Delay<br>When power is turned on while the start input is on, the NO output contact goes on. When a preset<br>time has elapsed after the start input turned off, the NO output contact goes off.<br>~~SS.~~<br>~~Saas~~<br>~~SS SSS~~|||off, the NO contact goes on again. When a preset time has elapsed after the start input turned off, the<br>NO contact goes off.<br>**Item**<br>**Terminal Number**<br>**Operation**<br>Power<br>(A) 2 - 10<br>(B) A - B<br>Start<br>(A) 5 - 6<br>(B) 2 - 5<br>Delayed<br>Contact<br>(A) 1 - 4, 8 - 11<br>(B) 1 - 7, 3 - 9<br>(NC)<br>(A) 1 - 3, 9 - 11<br>(B) 4 - 7, 6 - 9<br>(NO)<br>Indicator<br>PWR<br>OUT<br>Set Time<br>**T**<br>**T**<br>**Ta**<br>**T**<br>**T**<br>**Ta**<br>F: One-Shot (signal start)<br>~~EE~~<br>~~OLEE~~<br>~~Pe~~<br>~~eee~~||||



When a preset time has elapsed after the start input turned on while power is on, the NO output contact goes on. 

C: Cycle 4 (signal start, ON first) 

When the start input turns on while power is on, the NO contact goes on. The output oscillates at a preset cycle (duty ratio 1:1). 

**Item Terminal Number Operation** Power (A) 2 - 10(B) A - B Start (A) 5 - 6(B) 2 - 5 ~~SS.~~ Delayed Contact (A) 1 - 4, 8 - 11(B) 1 - 7, 3 - 9(A) 1 - 3, 9 - 11(B) 4 - 7, 6 - 9 (NO)(NC) PWR Indicator OUT ~~Saas~~ Set Time **T T T T T T T T Ta** ~~SS SSS~~ E: Signal OFF-Delay 

When power is turned on while the start input is on, the NO output contact goes on. When a preset time has elapsed after the start input turned off, the NO output contact goes off. 

When the start input turns on while power is on, the NO output contact goes on. When a preset time has elapsed, the NO output contact goes off. 

**Item Terminal Number Operation** ~~a~~ Power (A) 2 - 10(B) A - B has elapsed, the NO output contact goes off. **Item Terminal Number Operation** Start (A) 5 - 6(B) 2 - 5 Power (A) 2 - 10(B) A - B Delayed (A) 1 - 4, 8 - 11(B) 1 - 7, 3 - 9 (NC) Start (A) 5 - 6(B) 2 - 5 ~~—~~ Contact (A) 1 - 3, 9 - 11(B) 4 - 7, 6 - 9 (NO) ~~ae SS~~ Delayed (A) 1 - 4, 8 - 11(B) 1 - 7, 3 - 9 (NC) ~~—Y~~ Indicator PWR Contact (A) 1 - 3, 9 - 11(B) 4 - 7, 6 - 9 (NO) ~~==~~ OUT PWR Indicator Set Time **T Ta T Ta** OUT Set Time ~~es~~ 

**800-262-IDEC** (4332) • USA & Canada 

839 

**RTE** 

**Timers** 

## **Temperature Derating Curves** 

**==> picture [371 x 71] intentionally omitted <==**

**----- Start of picture text -----**<br>
Mounting B<br>[ } |_|<br>Mounting A<br>10A<br>7A<br>foyer. I 0H 1<br>7A<br>Mounting A 5A<br>Derating Curve50ºC 65ºC H o = a Mounting BDerating Curve '<br>Ambient Temperature  50ºC 65ºC<br>To t Ambient Temperature<br>Allowable Current Allowable Current<br>**----- End of picture text -----**<br>


## **Installation of Hold-Down Springs DIN Rail Mount Socket** 

**==> picture [137 x 91] intentionally omitted <==**

**----- Start of picture text -----**<br>
Insert the springs into the outer<br>slots with the projections<br>facing inside.<br>|<br>| C)) aie<br>1; i<br>d  ~~<br>ape OR .<br>Socket SR2P-06 Hold-down Spring (sold separately)<br>SFA-202 (use two springs)<br>**----- End of picture text -----**<br>


## **Instructions** 

**==> picture [139 x 85] intentionally omitted <==**

**----- Start of picture text -----**<br>
Insert the springs<br>into the slots.<br>i Bas ae“™. ><br>| Se<br>—_ Si<br>Socket SR2P-05 Hold-down Spring (sold separately)<br>SFA-203 (use two springs)<br>**----- End of picture text -----**<br>


## **Switch Settings** 

**==> picture [92 x 64] intentionally omitted <==**

**----- Start of picture text -----**<br>
j l<br>k<br>.<br>j Operator Mode Selector z“™.<br>k Scale Selector<br>l Time Range Selector<br>**----- End of picture text -----**<br>


1. Turn the selectors securely using a flat screwdriver 4mm wide (maximum). Note that incorrect setting may cause malfunction. Do not turn the selectors beyond their limits. 

2. Since changing the setting during timer operation may cause malfunction, turn power off before changing. 

## **Safety Precautions** 

Special expertise is required to use Electronic Timers. 

- All Electronic Timers are manufactured under IDEC’s rigorous quality control system, but users must add a backup or fail safe provision to the control system when using the Electronic Timer in applications where heavy damage or personal injury may occur should the Electronic Timer fail. 

   - Install the Electronic Timer according to instructions described in this catalog. 

   - Make sure that the operating conditions are as described in the specifications. If you are uncertain about the specifications, contact IDEC in advance. 

- In these directions, safety precautions are categorized in order of importance under Warning and Caution. 

## **Warnings** 

Warning notices are used to emphasize that improper operation may cause severe personal injury or death. 

- Turn power off to the Electronic timer before starting installation, removal, wiring, maintenance, and inspection on the Electronic Timer. 

## 

- Failure to turn power off may cause electrical shocks or fire hazard. 

- Do not use the Electronic Timer for an **emergency stop circuit** or **interlocking circuit** . If the Electronic Timer should fail, a machine malfunction, breakdown, or accident may occur. 

## **Caution** 

Caution notices are used where inattention might cause personal injury or damage to equipment. 

- The Electronic Timer is designed for installation in equipment. Do not install the Electronic Timer outside equipment. 

- Install the Electronic Timer in environments described in the specifications. If the Electronic Timer is used in places where it will be subjected to high-temperature, high-humidity, condensation, corrosive gases, excessive vibrations, or excessive shocks, then electrical shocks, fire hazard, or malfunction could result. 

- Use an IEC60127-approved fuse and circuit breaker on the power and output line outside the Electronic Timer. 

- Do not disassemble, repair, or modify the Electronic Timer. 

- When disposing of the Electronic Timer, do so as industrial waste. 

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**RTE** 

**Timers** 

## **Accessories** 

## **DIN Rail Mounting Accessories DIN Rail/Surface Mount Sockets and Hold-Down Springs** 

|DIN Rail Mount Socket|DIN Rail Mount Socket|DIN Rail Mount Socket|DIN Rail Mount Socket|Applicable Hold-Down Springs|Applicable Hold-Down Springs|
|---|---|---|---|---|---|
|Style|Appearance|Use with Timers|Part Number|Appearance|Part Number|
|11-Pin Screw Terminal<br>(dual tier)<br>RTE-P2<br>SR3P-05||||SFA-203||
|11-Pin FingerSafe Socket<br>RTE-P2<br>SR3P-05C||||||
|8-Pin Screw Terminal<br>RTE-P1<br>SR2P-06<br>8-Pin Fingersafe Socket<br>SR2P-05C<br>~~qf."~~||||SFA-202<br>SS<br>~~ene~~||
|11-Blade Screw Terminal<br>RTE-B1<br>RTE-B2<br>SR3B-05<br>~~qf."~~<br>~~ene~~||||||



## **Panel Mounting Accessories** 

## **Flush Panel Mount Adapter and Sockets that use an Adapter** 

|Accessory<br>Panel Mount Adapter|Description<br>Adaptor for flush panel<br>mounting RTE timers|Appearance<br>oy|Use with<br>All RTE timers|Part No.<br>RTB-G01|
|---|---|---|---|---|
||8-pin screw terminal<br>11-pin screw terminal|(Shown: SR6P-M08G Wiring Socket Adapter)<br>oe|RTE-P1<br>RTE-P2|SR6P-M08G<br>SR6P-M11G|
|Sockets for use with|||||
|Panel Mount Adapter|8-pin solder terminal<br>11-pin solder terminal|«<br>~~@~~|RTE-P1<br>RTE-P2|SR6P-S08<br>SR6P-S11|



**800-262-IDEC** (4332) • USA & Canada 

841 

**RTE** 

**Timers** 

~~’~~ 

~~ee~~ 

## **Dimensions** 

**==> picture [202 x 90] intentionally omitted <==**

**----- Start of picture text -----**<br>
77.9 13.0<br>36.0 13.7<br>wo =<br>—— 7.<br>FO] Elite<br>RTE-P1 (8 pin) Terminal Style<br>40.0<br>**----- End of picture text -----**<br>


**==> picture [67 x 7] intentionally omitted <==**

**----- Start of picture text -----**<br>
RTE-P2 (11 pin)Terminal Style<br>**----- End of picture text -----**<br>


ST: 7.3 tf RTE-B1/RTE-B2 (11 blade) Terminal Style 

## **Panel Mount Adapter** 

RTE Timer, 8-Pin and 11-Pin with SR6P-S08 or SR6P-S11 

**==> picture [232 x 225] intentionally omitted <==**

**----- Start of picture text -----**<br>
98 maximum<br>Panel Thickness 0.8 to 5mm<br>48 11 61.2 Back Wiring Socket<br>pty<br>RTE Timer, 8-Pin with SR6P-M08G<br>Mee [“a]<br>8-M3.5 Terminal Screw<br>44.6<br>3.5 max. 5.6 min.<br>OgOe 3 4 5 6 ø3.6 min.<br>| f Ee, - ls q 6.9 max.<br>2 1 8 7<br>7<br>80.5 9.8 x 3<br>RTE Timer, 11-Pin with SR6P-M11G<br>1.7<br>48 42.5<br>44.6 30.4<br>**----- End of picture text -----**<br>


Panel Thickness 0.8 to 5mm 

11-M3.5 Teminal Screws 

45 

16.7 3.5 max. 5.8 min. 2 1 11 7 6 ø3.6 min. 5 6.9 max. 4 3 8 9 10 30.5 7 Jee 92 8.5 x 4 

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**General Instructions** 

**Timers** 

## **General Instructions for All Timer Series** 

## **Load Current** 

With inductive, capacitive, and incandescent lamp loads, inrush current more than 10 times the rated current may cause welded contacts and other undesired effects. The inrush current and steady-state current must be taken into consideration when specifying a timer. 

## **Contact Protection** 

Switching an inductive load generates a counter-electromotive force (back EMF) in the coil. The back EMF will cause arcing, which may shorten the contact life and cause imperfect contact. Application of a protection circuit is recommended to safeguard the contacts. 

## **Temperature and Humidity** 

Use the timer within the operating temperature and operating humidity ranges and prevent freezing or condensation. After the timer has been stored below its operating temperature, leave the timer at room temperature for a sufficient period of time to allow it to return to operating temperatures before use. 

## **Environment** 

Avoid contact between the timer and sulfurous or ammonia gases, organic solvents (alcohol, benzine, thinner, etc.), strong alkaline substances, or strong acids. Do not use the timer in an environment where such substances are prevalent. Do not allow water to run or splash on the timer. 

## **Vibration and Shock** 

Excessive vibration or shocks can cause the output contacts to bounce, the timer should be used only within the operating extremes for vibration and shock resistance. In applications with significant vibration or shock, use of hold down springs or clips is recommended to secure a timer to its socket. 

## **Time Setting** 

The time range is calibrated at its maximum time scale; so it is desirable to use the timer at a setting as close to its maximum time scale as possible. For a more accurate time delay, adjust the control knob by measuring the operating time with a watch before application. 

## **Input Contacts** 

Use mechanical contact switch or relay to supply power to the timer. When driving the timer with a solid-state output device (such as a two-wire proximity switch, photoelectric switch, or solid-state relay), malfunction may be caused by leakage current from the solid-state device. Since AC types comprise a capacitive load, the SSR dielectric strength should be two or more times the power voltage when switching the timer power using an SSR. 

Generally, it is desirable to use mechanical contacts whenever possible to apply power to a timer or its signal inputs. When using solid state devices, be cautious of inrushes and back-EMF that may exceed the ratings on such devices. Some timers are specially designed so that signal inputs switch at a lower voltage than is used to power the timer (models designated as “B” type). 

## **Timing Accuracy Formulas** 

Timing accuracies are calculated from the following formulas: 

= ± 1 x Maximum Measured Value – Minimum Measured Value x 100% 

**Repeat Error** 

2 Maximum Scale Value 

= ± Tv - Tr x 100% **Voltage Error** Tr 

Tv: Average of measured values at voltage V Tr: Average of measured values at the rated voltage 

= ± Tt - T20 x 100% **Temperature Error** T20 

Tt: Average of measured values at °C T20: Average of measured values at 20°C 

= ± Average of Measured Values - Set Value x 100% **Setting Error** Maximum Scale Value 

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