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

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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
@ ± 14 mA max 30 100
with ± 15 V @ ± 10 mA max 100 350
@ ± 14 mA max 100 190
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
RS Resistance of secondary winding @ TA = 70 °C 110
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
UC
RM
R1
IS
UC
HV
HV
HV HV
A
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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
Cp
, d
CI
, Û
W
Rated insulation voltage Nominal voltage
Basic insulation
1600 V
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.
’le 2r: 4,“ 152" nyDObESmm :1 "- “ ; 4 g , + , N N_ m 6 D (\4 , Exz’n‘m N \z “ 2 Hm ElemEr—V pusmun 45 _ m L N LEM" m * ACE “ \ g can mm 195
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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
UC
RM
R1
IS
UC
HV
HV
HV HV
dCl dCp
UC
RM
R1
IS
UC
HV
HV
HV HV
dCl dCp
UC
RM
R
1
IS
UC
HV
HV
HV HV
dCl dCp
UC
RM
R1
IS
UC
HV
HV
HV HV

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