LAH25-NP Datasheet, PDF (1/2 Pages) LEM – Current Transducer LAH 25-NP

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
Electrical data
I
Primary nominal r.m.s. current
PN
I_P
Primary current, measuring range ¹⁾
R
Measuring resistance @
M
25
At
0 .. 55
At
T = 70°C T = 85°C
A
A
R R R R _{M min M max M min M max}
with ± 12 V
with ± 15 V
@ I_PN [± At _DC ]
@ I_PN [At _RMS ] ²⁾
@ I_PN [± At _DC ]
@ I [At ] ²⁾
PN
RMS
@ 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_S mA
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
I
O
I_OM
I
OT
t_{r a}
t_r
di/dt
f
Offset current @ T = 25°C
A
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 mA
± 0.20 ± 0.25 mA
± 0.10 ± 0.60 mA
± 0.10 ± 0.70 mA
< 200
< 500
> 200
DC .. 200
ns
ns
A/µs
kHz
General data
T_A
Ambient operating temperature
T
Ambient storage temperature
S
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 ⁷⁾
EN 50178
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) A list of corresponding tests is available.
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.
010822/3
LEM Components
www.lem.com