LAH25-NP_06 Datasheet, PDF (1/2 Pages) LEM – Current Transducer

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).
I_PN = 8-12-25 A
16038
Electrical data
I_PN Primary nominal r.m.s. current
I_P
Primary current, measuring range ¹⁾
R_M Measuring resistance @
25
At
0 .. 55
At
T_A = 70°C T_A = 85°C
R R R R _{M min Mmax M min Mmax}
with ± 12 V
with ± 15 V
@ I_PN [± At _DC ]
@ I_PN [At _RMS ] ²⁾
@ I_PN [± At _DC ]
@ I_PN [At _RMS ] ²⁾
@ I_P
<
I 3)
PN
0 257 0 252 Ω
0 155 0 150 Ω
67 371 70 366 Ω
67 236 70 231 Ω
I_SN Secondary nominal r.m.s. current
25
mA
K _N Conversion ratio
1 - 2 - 3 : 1000
V_C Supply voltage (± 5 %)
± 12 .. 15
V
I_C
Current consumption
10 (@ ± 15V) + I m A
S
V_d
R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn 5
kV
V_b
R.m.s. rated voltage ⁴⁾
600
V
Accuracy - Dynamic performance data
X
ε_L
Accuracy ⁵⁾ @ I_PN, T_A = 25°C
Linearity error
I_O
I_OM
I_OT
t_{r a}
t_r
di/dt
f
Offset current @ T_A = 25°C
Residual current @ I_P = 0, after an overload of 5 x I_PN
Thermal drift of I_O
0°C .. + 70°C
- 25°C .. + 85°C
Reaction time @ 10 % of I_PN
Response time ⁶⁾ @ 90 % of I_PN
di/dt accurately followed
Frequency bandwidth (- 1 dB)
± 0.3
%
< 0.2
%
Typ Max
± 0.15 m A
± 0.20 ± 0.25 m A
± 0.10 ± 0.60 m A
± 0.10 ± 0.70 m A
< 200
< 500
> 200
DC .. 200
ns
ns
A/µ s
kHz
General data
T_A
Ambient operating temperature
T_S
Ambient storage temperature
R _S Secondary coil resistance
m Mass
- 25 .. + 85
°C
- 40 .. + 90
°C
@ T_A = 70°C 99
Ω
@ T_A = 85°C 104
Ω
20
g
Standards
EN 50178 : 1997
Notes : 1)During 10 s, with R_M ≤ 109 Ω (V_C = ± 15 V) - 2) 50 Hz Sinusoidal -
3) The measuring resistance R_{M min} may be lower (see "LAH Technical Informa-
tion" leaflet) - 4) Pollution class 2, cat. III - 5) Without I_O & I_OM - 6) With a di/dt of
100 A/µs - 7)
Features
• Closed loop (compensated) multi-
range current transducer using the
Hall effect
• Printed circuit board mounting
• Insulated 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
• 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.
060213/5
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
page 1/2
LEM
www.lem.com