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Current Transducer LAH 25-NP
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).
IPN = 8-12-25 A
16038
Electrical data
IPN IP RM Primary nominal r.m.s. current Primary current, measuring range Measuring resistance @ with 12 V with 15 V @ @ @ @ @
1)
25 At 0 .. 55 At TA = 70C TA = 85C RM min RM max RM min RM max 0 0 67 67 257 155 371 236 0 0 70 70 252 150 366 231
Features
* Closed loop (compensated) multirange current transducer using the Hall effect * Printed circuit board mounting * Insulated plastic case recognized according to UL 94-V0.
IPN [ At DC ] IPN [At RMS ] 2) IPN [ At DC ] IPN [At RMS ] 2) IP < IPN 3)
ISN KN VC IC Vd Vb
Secondary nominal r.m.s. current Conversion ratio Supply voltage ( 5 %) Current consumption R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn R.m.s. rated voltage 4)
25 mA 1 - 2 - 3 : 1000 12 .. 15 V 10 (@ 15V) + I S m A 5 kV 600 V
Advantages
* * * * * * *
Excellent accuracy Very good linearity Low temperature drift Optimized response time Wide frequency bandwidth No insertion losses High immunity to external interference * Current overload capability.
Accuracy - Dynamic performance data
X
L
Accuracy 5) @ IPN, TA = 25C Linearity error Offset current @ TA = 25C Residual current @ IP = 0, after an overload of 5 x IPN Thermal drift of IO 0C .. + 70C - 25C .. + 85C Reaction time @ 10 % of IPN Response time 6) @ 90 % of IPN di/dt accurately followed Frequency bandwidth (- 1 dB)
0.3 < 0.2 Max 0.15 0.20 0.25 0.10 0.60 0.10 0.70 < 200 < 500 > 200 DC .. 200 Typ
% % mA mA mA mA ns ns A/ s kHz
IO IOM IOT tr a tr di/dt f
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)
General data
TA TS RS m Ambient operating temperature Ambient storage temperature Secondary coil resistance Mass Standards - 25 .. + 85 C - 40 .. + 90 C 99 104 20 g EN 50178 : 1997
* Power supplies for welding
applications.
@ TA = 70C @ TA = 85C
Notes : 1)During 10 s, with R M 109 (V C = 15 V) - 2) 50 Hz Sinusoidal 3) The measuring resistance RM min may be lower (see "LAH Technical Information" leaflet) - 4) Pollution class 2, cat. III - 5) Without IO & IOM - 6) With a di/dt of 100 A/s - 7)
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
060213/5
page 1/2
LEM
w w w .lem.com
Dimensions LAH 25-NP (in mm. 1 mm = 0.0394 inch)
Connection Bottom view
Left view
Front view
Number of primary turns Primary current nominal maximum Nominal output current Turns ratio Primary resistance Primary insertion inductance Recommended PCB c o n n e c t i o n s
3 2 1 IN
IPN [ A ] 25
IP
[A] 55
ISN
[ mA ] 25
KN 1 : 1000
RP
[ m ] 0.18
LP 0.012
[ H ]
1
OUT
456 3 2 1 IN
2
12
27
24
2 : 1000
0.81
0.054
OUT 456 3 2 1 IN
3
8
18
24
3 : 1000
1.62
0.110
OUT 456
Mechanical characteristics
* General tolerance * Fastening & connection of primary
Recommended PCB hole * Fastening & connection of secondary Recommended PCB hole 0.2 mm 6 pins 1 x 0.8 mm 1.5 mm 3 pins 0.7 x 0.6 mm 1.2 mm
Remarks
* IS is positive when IP flows from terminals 1, 2, 3 (IN) to * The jumper temperature and PCB should not exceed 100C. * This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...), please contact us.
060213/5
terminals 6, 5, 4 (OUT).
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
page 2/2
LEM
w w w .lem.com

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