LA55-P_09 Datasheet, PDF (1/3 Pages) LEM – Current Transducer

Current Transducer LA 55-P
For the electronic measurement of currents: DC, AC, pulsed...,
with galvanic isolation between the primary circuit (high power) and
the secondary circuit (electronic circuit).
I_PN = 50 A
16019
Electrical data
I_PN
Primary nominal current rms
50
A
I_PM Primary current, measuring range 0 .. ± 70
A
R_M Measuring resistance
T_A = 70°C T_A = 85°C

R R R R _{M min M max M min M max}

with ± 12 V
@ ± 50 A _max
10 100 60 95
Ω

@ ± 70 A _max
10 50 60 ¹⁾ 60 ¹⁾ Ω

with ± 15 V
@ ± 50 A _max
50 160 135 155 Ω

@ ± 70 A _max
50 90 135 ²⁾ 135 ²⁾ Ω
I_SN
Secondary nominal current rms
50
mA
K_N Conversion ratio 1 : 1000
V_C Supply voltage (± 5 %) ± 12 .. 15
V
I_C
Current consumption 10 (@ ± 15 V) + I_S mA
Accuracy - Dynamic performance data
X
ε
L
I_O
I_OM
I_OT
t_ra
t_r
di/dt
BW
Accuracy @ I_PN , T_A = 25°C @ ± 15 V (± 5 %)
@ ± 12 .. 15 V (± 5 %)
± 0.65
± 0.90
Linearity error < 0.15
Typ Max
Offset current @ I_P = 0, T_A = 25°C
Magnetic offset current ³⁾ @ I_P = 0 and specified R_M,
after an overload of 3 x I_PN
Temperature variation of I_O
- 25°C .. + 85°C ± 0.1

- 40°C .. - 25°C ± 0.2
± 0.2
± 0.3
± 0.6
± 1.0
Reaction time to 10 % of I_PN step
Response time to 90 % of I_PN step
di/dt accurately followed
< 500
< 1
> 200
Frequency bandwidth (- 1 dB) DC .. 200
%
%
%
mA
mA
mA
mA
ns
µs
A/µs
kHz
General data
T_A
Ambient operating temperature - 40 .. + 85
°C
T_S
Ambient storage temperature - 40 .. + 90
°C
R_S Secondary coil resistance
@ T_A = 70°C
80
Ω
@ T_A = 85°C
85
Ω
m
Mass 18
g
Standards EN 50178: 1997
Features
●● Closed loop (compensated)
current transducer using the Hall
effect
●● Printed circuit board mounting
●● Isolated 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.
Application domain
●● Industrial.
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.}
090519/14
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
Page 1/3
www.lem.com