LF 505-S

## **Current Transducer LF 505-S** 

## **I = PN** 

## **500 A** 

For the electronic measurement of currents: DC, AC, pulsed..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). 

## 16137 ~~C~~ E RAMs iy **Electrical data** —— 

**I** PN Primary nominal current rms 500 A **I** PM Primary current, measuring range 0 .. ± 800 A **R** M Measuring resistance **R** M mini **R** M maxi with ± 15 V @ ± 500 A maxi 0 60 Ω @ ± 800 A maxi 0 11 Ω with ± 18 V @ ± 500 A maxi 0 92 Ω @ ± 800 A maxi 0 30 Ω with ± 24 V @ ± 500 A maxi 5 149 Ω @ ± 800 A maxi 5 65 Ω **I** SN Secondary nominal current rms 100 mA **K** N Conversion ratio 1 : 5000 **V** C Supply  voltage (± 5 %) ± 15 .. 24 V **I** C Current consumption (± 1 mA) 24 (@ ± 18 V) + **I** S mA 

## **Features** 

- Closed loop (compensated) current transducer using the Hall effect 

- Isolated plastic case recognized according to UL 94-V0. 

## **Advantages** 

- Excellent accuracy 

- Very good linearity 

- Low temperature drift 

- Optimized response time 

- Wide frequency bandwidth 

- No insertion losses 

## > **Accuracy - Dynamic performance data** 

**X** Accuracy @ **I** PN , **T** A = 25°C ± 0.6 % ε L Linearity error < 0.1 % Typ Maxi **I** O Offset current @ **I** P = 0, **T** A = 25°C ± 0.4 mA **I** OM Magnetic offset current @ **I** P = 0 and specified **R** M, after an overload of 3 x **I** PN ± 0.2 mA **I** OT Temperature variation of **I** O - 40°C .. + 70°C ± 0.1 ± 0.4 mA **t** r Response time[ 1)] to 90 % of **I** PN step < 1 µs **di/dt** di/dt accurately followed > 100 A/µs **BW** Frequency bandwidth (- 1 dB) DC .. 100 kHz 

## > **General data** 

|**T**A|Ambient operating temperature||- 40 .. + 70|°C|
|---|---|---|---|---|
|**T**S|Ambient storage temperature||- 40 .. + 85|°C|
|**R**S|Secondary coil resistance|@**T**A= 70°C|70|Ω|
|**_m_**|Mass||230|g|
||Standards||EN 50155: 1995||
||||EN 50178: 1997||



- High immunity to external interference 

- Current overload capability. 

## **Applications** 

- AC variable speed drives and servo motor drives 

- Static converters for DC motor drives 

- Battery supplied applications 

- Uninterruptible Power Supplies (UPS) 

- Switched Mode Power Supplies (SMPS) 

- Power supplies for welding applications. 

## **Applications  domain** 

- Traction 

- Industrial. 

Note:[1)] With a di/dt of 100 A/µs. 

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LEM  reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. 

071003/10 

www .lem.com 

## **Current Transducer  LF 505-S** 

## CT **Isolation characteristics** 

**V** d Rms voltage for AC isolation test, 50 Hz, 1 min 3.8 kV **V** w Impulse withstand voltage 1.2/50 µs 12.5 kV Mini **dCp** Creepage distance 15.2 m m **dCl** Clearance distance 14.5 m m **CTI** Comparative Tracking Index  (Group IIIa) 175 

## **Application examples** 

**According to EN 50178 and CEI 61010-1 standards** and following conditions: 

- Over voltage category OV 3 

- Pollution degree PD2 

• Non-uniform field 

**EN 50178 CEI 61010-1** dCp, dCI, **VW** Rated isolation voltage Nominal voltage ~~eeeeee ee~~ Single isolation 1250 V 1250 V rms Reinforced isolation 690 V 690 V rms ~~eees~~ 

## **Safety** 

This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the  manufacturer's operating instructions. 

Caution, risk of electrical shock 

When operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary busbar, power supply). 

Ignoring this warning can lead to injury and/or cause serious damage. This transducer is a built-in device, whose conducting parts must be inaccessible after installation. 

A protective housing or additional shield could be used. Main supply must be able to be disconnected. 

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LEM  reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. 

071003/10 

www .lem.com 

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## **Dimensions  LF 505-S** (in mm. 1 mm = 0.0394 inch) 

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Bottom view<br>Right view Back view<br>Top view<br>Connection<br>**----- End of picture text -----**<br>


## **Mechanical characteristics** 

- General tolerance 

± 0.5 mm 

• Transducer fastening Vertical or flat lying position 4 or 6 holes ∅ 4.3 mm 4 or 6 steel screws M4 Recommended fastening torque 3.2 Nm or 2.37 Lb.-Ft. or vertical position 4 holes ∅ 1.9 mm, depth : 7.5 mm 4 screws PTKA 25, length: 6 mm Recommended fastening torque 0.7 Nm or 0.52 Lb.-Ft. or flat lying position 4 holes ∅ 1.9 mm, crossing 4 screws PTKA 25, length:10 mm Recommended fastening torque 0.75 Nm or 0.55 Lb.-Ft. • Primary through-hole ∅ 30.2 mm • Connection of secondary MOLEX 6410 3 Tin plated pins 

## **Remarks** 

- **I** S is positive when **I** P flows in the direction of the arrow. 

- Temperature of the primary conductor should not exceed 100°C. 

- Dynamic performances (di/dt and response time) are best with a single bar completely filling the primary hole. 

- This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. 

LEM  reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice. 

page 3/3 

071003/10 

www .lem.com