LA125-P Datasheet, PDF (1/2 Pages) LEM – Current Transducer LA 125-P

Current Transducer LA 125-P
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 = 125 A
Electrical data
I_PN
Primary nominal r.m.s. current
I
Primary current, measuring range
P
R_M Measuring resistance @
125
A
0 .. ± 200
A
T_A = 70°C T_A = 85°C
RR RR
M min M max M min M max
with ± 12 V
with ± 15 V
@ ± 125 A
max
@ ± 200 A _max
@ ± 125 A
max
@ ± 200 A _max
5 52
5 20
25 74
25 34
14 50 Ω
14 18 Ω
40 72 Ω
40 ¹⁾ 40 ¹⁾ Ω
I_SN
Secondary nominal r.m.s. current
K _N Conversion ratio
V_C Supply voltage (± 5 %)
I_C
Current consumption
V_d
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
125
mA
1 : 1000
± 12 .. 15
V
16 (@ ± 15 V) + I_S mA
3
kV
Accuracy - Dynamic performance data
X
Accuracy @ I_PN , T_A = 25°C
@ ± 15 V (± 5 %) ± 0.60
%
@ ± 12 .. 15 V (± 5 %) ± 0.80
%
ε_L
Linearity
< 0.15
%
Typ Max
I
Offset current @ I = 0, T = 25°C
O
P
A
± 0.40 mA
I_OM Residual current ²⁾ @ I_P = 0, after an overload of 3 x I_PN
± 0.50 mA
I
Thermal drift of I
OT
O
0°C .. + 70°C ± 0.15 ± 0.50 mA
- 25°C .. + 85°C ± 0.15 ± 0.60 mA
t
ra
t_r
di/dt
f
Reaction time @ 10 % of I
P max
Response time ^{3) 4)} @ 90 % of I_{P max}
di/dt accurately followed ⁴⁾
Frequency bandwidth ⁴⁾ (- 1 dB)
< 500
<1
> 200
DC .. 100
ns
µs
A/µ s
kHz
General data
T_A
Ambient operating temperature
T
Ambient storage temperature
S
R _S Secondary coil resistance @
m
Mass
Standards ⁵⁾
- 25 .. + 85
°C
- 40 .. + 90
°C
T_A = 70°C 32
Ω
T = 85°C 33.5
A
Ω
40
g
EN 50178
Notes : 1) Measuring range limited to ± 180 A
max
2) _{The result of the coercive field of the magnetic circuit}
3) _{With a di/dt of 100 A/µs}
4) _{The primary conductor is best filling the through-hole and/or the return}
of the primary conductor is above the top of the transducer
5) _{A list of corresponding tests is available}
Features
•Closed loop (compensated) 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.
980716/5
LEM Components
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