LV 25-P, Voltage Transducer Datasheet by LEM USA Inc.

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12August2014/version 19 LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice www.lem.com

N° 97.27.19.000.0

Voltage Transducer LV 25-P

For the electronic measurement of currents: DC, AC, pulsed...,

with galvanic separation between the primary circuit and the secondary

circuit.

Electrical data

IPN Primary nominal rms current 10 mA

IPM Primary current, measuring range 0 .. ± 14 mA

RM Measuring resistance RM min RM max

with ± 12 V @ ± 10 mA max 30 190 Ω

@ ± 14 mA max 30 100 Ω

with ± 15 V @ ± 10 mA max 100 350 Ω

@ ± 14 mA max 100 190 Ω

ISN Secondary nominal rms current 25 mA

KN Conversion ratio 2500 : 1000

UC Supply voltage (± 5 %) ± 12 .. 15 V

IC Current consumption 10 (@ ± 15 V) + IS mA

Accuracy - Dynamic performance data

XG Overall accuracy @ IPN, TA = 25 °C @ ± 12 .. 15 V ± 0.9 %

@ ± 15 V (± 5 %) ± 0.8 %

εL Linearity error < 0.2 %

Typ Max

IO Offset current @ IP = 0, TA = 25 °C ± 0.15 mA

IOT Temperature variation of IO 0 °C .. + 25 °C ± 0.06 ± 0.25 mA

+ 25 °C .. + 70 °C ± 0.10 ± 0.35 mA

tr Step response time 1) to 90 % of IPN 40 µs

General data

TA Ambient operating temperature 0 .. + 70 °C

TS Ambient storage temperature - 25 .. + 85 °C

RP Resistance of primary winding @ TA = 70 °C 250 Ω

RS Resistance of secondary winding @ TA = 70 °C 110 Ω

m Mass 22 g

Standards EN 50178: 1997

UL 508: 2010

Note: 1) R1 = 25 kΩ (L/R constant, produced by the resistance and inductance of

the primary circuit).

IPN = 10 mA

VPN = 10 .. 500 V

Features

● Closed loop (compensated)

current transducer using the Hall

effect

● Insulating plastic case recognized

according to UL 94-V0.

Principle of use

● For voltage measurements,

a current proportional to the

measured voltage must be

passed through an external

resistor R1 which is selected by

the user and installed in series

with the primary circuit of the

transducer.

Advantages

● Excellent accuracy

● Very good linearity

● Low thermal drift

● Low response time

● High bandwidth

● High immunity to external

interference

● Low disturbance in common

mode.

Applications

● AC variable speed drives and

servo motor drives

● Static converters for DC motor

drives

● Battery supplied applications

● Uninterruptible Power Supplies

(UPS)

● Power supplies for welding

applications.

Application domain

● Industrial.

dCl dCp

HV HV

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Voltage Transducer LV 25-P

Insulation coordination

Ud Rms voltage for AC insulation test, 50 Hz, 1 min 2.5 1) kV

ÛW Impulse withstand voltage 1.2/50 µs 16 kV

Min

dCp Creepage distance 19.5 mm

dCI Clearance 19.5 mm

CTI Comparative tracking index (group IIIa) 175

Note: 1) Between primary and secondary.

Applications examples

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

● Over voltage category OV 3

● Pollution degree PD2

● Non-uniform field

Safety

This transducer must be used in limited-energy secondary circuits according to

IEC 61010-1.

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 build-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.

EN 50178 IEC 61010-1

, d

, Û

Rated insulation voltage Nominal voltage

Basic insulation

1600 V

Reinforced insulation 800 V 800 V

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UL 508:Ratings and assumptions of certification

File # E189713 Volume: 2 Section: 1

Standards

● CSA C22.2 NO. 14 - 10 INDUSTRIAL CONTROL EQUIPMENT - Edition 11 - Revision Date 2011/08/01

● UL 508 STANDARD FOR INDUSTRIAL CONTROL EQUIPMENT - Edition 17 - Revision Date 2010/04/15.

Parameter Symbol Unit Value

Primary involved potential V AC/DC 600

Max surrounding air temperature TA°C 85

Primary current IPmA 0 to 10

Secondary supply voltage UCV DC ± 12 to ±15

Secondary nominal rms current ISN mA 25

Conditions of acceptability

When installed in the end-use equiment, consideration shall be given to the following:

1 - These devices must be mounted in a suitable end-use enclosure.

2 - The terminals have not been evaluated for field wiring.

3 - The LV 25-P series are intended to be mounted on the printed wiring board of the end-use equipment (with a minimum CTI

of 100).

4 - The LV 25-P series shall be used in a pollution degree 2 environment when the Printed Wiring Board has not been coated.

5 - The LV 25-P series shall be mounted on the load side of line filters.

6 - Low voltage circuits are intended to be powered by a circuit derived from an isolating source (such as a transformer,optical

isolator,limiting impedance or electro-mechanical relay) and having no direct connection back to the primary circuit (other

than through the grounding means).

7 - Base on results of temperature tests, int he end use application, a maximum of 100 °C cannot be exceeded at soldering

point between primary coil pin and soldering point of on the primary bus bar (corrected to the appropriate evaludated max.

surrounding air).

Marking

Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL’s

Follow-Up Service.Always look for the Mark on the product.

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Dimensions LV 25-P (in mm)

Mechanical characteristics

● General tolerance ± 0.2 mm

● Fastening & connection of primary 2 pins

0.635 × 0.635 mm

● Fastening & connection of secondary 3 pins Ø 1 mm

● Recommended PCB hole Ø 1.2 mm

Remarks

●IS is positive when VP is applied on terminal + HV.

● Installation of the transducer must be done unless

otherwise specified on the datasheet, according to LEM

Transducer Generic Mounting Rules. Please refer to

LEM document N°ANE120504 available on our Web site:

Products/Product Documentation.

● This is a standard model. For different versions (supply

voltages, turns ratios, unidirectional measurements...),

please contact us.

Instructions for use of the voltage transducer model LV 25-P

Primary resistor R1: the transducer’s optimum accuracy is obtained at the nominal primary current. As far as possible, R1 should

be calculated so that the nominal voltage to be measured corresponds to a primary current of 10 mA.

Example: Voltage to be measured VPN = 250 V a) R1 = 25 kΩ / 2.5 W, IP = 10 mA Accuracy = ± 0.9 % of VPN (@ TA= + 25 °C)

b) R1 = 50 kΩ / 1.25 W, IP = 5 mA Accuracy = ± 1.5 % of VPN (@ TA= + 25 °C)

Operating range (recommended): taking into account the resistance of the primary windings (which must remain low compared

to R1, in order to keep thermal deviation as low as possible) and the insulation, this transducer is suitable for measuring nominal

voltages from 10 to 500 V.

dCl dCp

HV HV

dCl dCp

HV HV

dCl dCp

HV HV

dCl dCp

HV HV

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