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LEM |
www.DataSheet4U.com
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).
IPN = 50 A
Electrical data
IPN Primary nominal r.m.s. current
I Primary current, measuring range
P
RM Measuring resistance @
50
0 .. ± 70
TA = 70°C TA = 85°C
RR RR
M min M max M min M max
A
A
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
ISN Secondary nominal r.m.s. current
K N Conversion ratio
VC Supply voltage (± 5 %)
IC Current consumption
Vd R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
50 mA
1 : 1000
± 12 .. 15
V
10 (@ ±15 V) + IS mA
2.5 kV
Accuracy - Dynamic performance data
X Accuracy @ I , T = 25°C
PN A
@ ± 15 V (± 5 %) ± 0.65
@ ± 12 .. 15 V (± 5 %) ± 0.90
ε Linearity
L
< 0.15
%
%
%
Typ Max
I Offset current @ I = 0, T = 25°C
O PA
± 0.2 mA
IOM Residual current 3) @ IP = 0, after an overload of 3 x IPN
± 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
tra
t
r
di/dt
f
Reaction time @ 10 % of IP 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
TA Ambient operating temperature
TS Ambient storage temperature
R S Secondary coil resistance @
m Mass
Standards 4)
TA = 70°C
TA = 85°C
- 25 .. + 85
- 40 .. + 90
80
85
18
EN 50178
°C
°C
Ω
Ω
g
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
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LEM Components
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Dimensions LA 55-P (in mm. 1 mm = 0.0394 inch)
Bottom view
Left view
swiss
made
Secondary terminals
Terminal + : supply voltage + 12 .. 15 V
Terminal - : supply voltage - 12 .. 15 V
Terminal M : measure
Connection
Standard 00
or N° SP..
Front view
Year Week
Mechanical characteristics
•General tolerance
•Primary through-hole
•Fastening & connection of secondary
Recommended PCB hole
Remarks
± 0.2 mm
12.7 x 7 mm
3 pins
0.63 x 0.56mm
0.9 mm
•IS is positive when IP flows in the direction of the arrow.
•Temperature of the primary conductor should not exceed
90°C.
•Dynamic performances (di/dt and response time) are best
with a single bar completely filling the primary hole.
•In order to achieve the best magnetic coupling, the primary
windings have to be wound over the top edge of the device.
•This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
www.DataSheet4U.com
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
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