LV 20-P, Voltage Transducer Datasheet by LEM USA Inc.

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Notes
Voltage Transducer LV 20-P
For the electronic measurement of voltages : DC, AC, pulsed...,
with a galvanic isolation between the primary circuit (high voltage)
and the secondary circuit (electronic circuit).
Electrical data
I PN Primary nominal r.m.s. current 10 mA
IPPrimary current, measuring range 0 .. ± 14 mA
R M 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 r.m.s. current 25 mA
K N Conversion ratio 2500 : 1000
VCSupply voltage (± 5 %) ± 12 .. 15 V
ICCurrent consumption 10 (@ ± 15 V) + ISmA
VdR.m.s. voltage for AC isolation test 1), 50 Hz, 1 mn 2.5 kV
Accuracy - Dynamic performance data
X G Overall Accuracy @ IPN , TA = 25°C @ ± 12 .. 15 V ± 1.1 %
@ ± 15 V (± 5 %) ± 1.0 %
εLLinearity < 0.2 %
Typ Max
IOOffset current @ IP = 0, TA = 25°C ± 0.20 mA
IOTThermal drift of IO0°C .. + 25°C ± 0.10 ± 0.30 mA
+ 25°C .. + 70°C ± 0.14 ± 0.40 mA
trResponse time 2) @ 90 % of VP max 40 µs
General data
TAAmbient operating temperature 0 .. + 70 °C
TSAmbient storage temperature - 25 .. + 85 °C
R P Primary coil resistance @ TA = 70°C 250
R S Secondary coil resistance @ TA = 70°C 110
mMass 22 g
Standards 3) EN 50178
Notes : 1) Between primary and secondary
2) R 1 = 25 k (L/R constant, produced by the resistance and inductance
of the primary circuit)
3) A list of corresponding tests is available
Features
Closed loop (compensated) voltage
transducer using the Hall effect
Insulated plastic case recognized
according to UL 94-V0
Optimized.
Principle of use
For voltage measurements, a current
proportional to the measured voltage
must be passed through an external
resistor R 1 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.
010802/0
IPN =10 mA
VPN =10 .. 500 V
LEM Components www.lem.com
261 MM): sr l—flel 2x mo.o35riirii ; ' i V . :7 L rl—lT aHT ' LEM® less N — ml“ or N m m r o N a e C G 3xm’lmln LV ZO—P + ¢ +/ ,7 , oo—onou I 7 + M ' - E M / +k a i 7 7m , _ 2x7I oz _ 16 45 1. Sara: ’/ \ \ i Secondary terminals Terminal 4- : supply voltage 4- 12..15V Terminal M : measure Terminal - : supply voltage - 12..15V Connection LHI __ g @ Ri '3 v o N i i is all ;_ LV 2n P M uv l H ~ r“ , Back View Mechanical characteristics Remarks 0 General tolerance 1 0.2 mm 0 IS is positlve when VP is applied on terminal +HT. 0 Fastening &conneotion olprlmary 2 pins 0 This is a standard model. For ditlerent versions (su 0.635x 0.635 mm voltages. turns ratios, unidirectional measurements 0 Fastening & connection ol secondary 3 pins 0 1 mm please contact us. 0 Recommended FOE! hole 1.2 mm Instruclions to! use 0| [he voltage llansducer model LV 20-P Primary resistor Ry : the transducer‘s optimum accuracy is obtained at the nominal primary current. As much as possible, Ry should be calculated so tnat tne nominal voltage to be measured corresponds to a primary current at 10 M. Example: Voltage to be measured VPN : 250 v a) Ry: 25 kfl/2.5 w. I? e 10 mA Accuracy : + i «=4. olVaN l® TA : +25vcl b) Ry :SDkn/l 25 w, IV: 5 mA Accuracy 2 vs oiVPyy l® 'rA :425vcl Operating range (recommended) : BKing into account the resistance at the primary Windings (which must remain low compared to Ry in o to keep tnermal deviation as low as possible) and the isolation, this transducer is suitable lor measuring nominal voltages lrom m to 500 LEM reserves the right to carry out modifications on lts transducers, in order to improve them, without previous not
Bottom view Right view Top view
Dimensions LV 20-P (in mm. 1 mm = 0.0394 inch)
Remarks
IS is positive when VP is applied on terminal +HT.
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
Mechanical characteristics
General tolerance ± 0.2 mm
Fastening & connection of primary 2 pins
0.635 x 0.635 mm
Fastening & connection of secondary 3 pins 1 mm
Recommended PCB hole 1.2 mm
Secondary terminals
Terminal +:supply voltage +12 .. 15 V
Terminal M:measure
Terminal -:supply voltage -12 .. 15 V
Connection
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Instructions for use of the voltage transducer model LV 20-P
Primary resistor R 1 : the transducer’s optimum accuracy is obtained at the nominal primary current. As much as possible, R 1 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) R 1 = 25 k / 2.5 W, IP = 10 mA Accuracy = ± 1 % of VPN (@ TA = + 25°C)
b) R 1 = 50 k / 1.25 W, IP = 5 mA Accuracy = ± 2 % of VPN (@ TA = + 25°C)
Operating range (recommended) : taking into account the resistance of the primary windings (which must remain low compared to R 1, in order
to keep thermal deviation as low as possible) and the isolation, this transducer is suitable for measuring nominal voltages from 10 to 500 V.
Back view
Standard 00
or No SP..
Year Week

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