LA55P Datasheet, PDF (1/2 Pages) LEM – Current Transducer LA 55-P

Current Transducer LA 55-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 = 50 A
Electrical data
I_PN
Primary nominal r.m.s. current
I
Primary current, measuring range
P
R_M Measuring resistance @
50
A
0 .. ± 70
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
@ ± 50 A
max
@ ± 70 A _max
@ ± 50 A
max
@ ± 70 A _max
10 100 60 95 Ω
10 50 60¹⁾ 60¹⁾ Ω
50 160 135 155 Ω
50 90 13 5²⁾ 135²⁾ 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
50
mA
1 : 1000
± 12 .. 15
V
10 (@ ±15 V) + I_S mA
2.5
kV
Accuracy - Dynamic performance data
X
Accuracy @ I , T = 25°C
@ ± 15 V (± 5 %) ± 0.65
%
PN A
@ ± 12 .. 15 V (± 5 %) ± 0.90
%
ε_L
Linearity
< 0.15
%
Typ Max
I
Offset current @ I = 0, T = 25°C
O
P
A
± 0.2 mA
I_OM
Residual current ³⁾ @ I_P = 0, after an overload of 3 x I_PN
± 0.3 mA
I
Thermal drift of I
OT
O
0°C .. + 70°C ± 0.1 ± 0.5 mA
- 25°C .. + 85°C ± 0.1 ± 0.6 mA
t_ra
t
r
di/dt
f
Reaction time @ 10 % of I_{P max}
Response time @ 90 % of I
P max
di/dt accurately followed
Frequency bandwidth (- 1 dB)
< 500
<1
> 200
DC .. 200
ns
µs
A/µ s
kHz
General data
T_A
Ambient operating temperature
T_S
Ambient storage temperature
R _S Secondary coil resistance @
m
Mass
Standards ⁴⁾
- 25 .. + 85
°C
- 40 .. + 90
°C
T_A = 70°C 80
Ω
T_A = 85°C 85
Ω
18
g
EN 50178
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.
Notes : 1) Measuring range limited to ± 60 A
max
2) _{Measuring range limited to ± 55 A}
max
3) _{Result of the coercive field of the magnetic circuit}
4) _{A list of corresponding tests is available}
980706/8
LEM Components
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