Current Transducer LA 50-S/SP1
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).
Electrical data
I
PN
Primary nominal r.m.s. current
50
A
I
P
Primary current, measuring range
0 .. 100
A
R
M
Measuring resistance
R
M min
R
M max
with 15 V
@ 50 A
max
0
330
@ 100 A
max
0
100
I
SN
Secondary nominal r.m.s. current
25
mA
K
N
Conversion ratio
1 : 2000
V
C
Supply voltage ( 5 %)
15
V
I
C
Current consumption
10 + I
S
mA
V
d
R.m.s. voltage for AC isolation test, 50 Hz, 1 min
3
kV
Accuracy - Dynamic performance data
X
G
Overall accuracy @ I
PN,
T
A
= 25C
0.5
%
L
Linearity
< 0.1
%
Typ
Max
I
O
Offset current @ I
P
= 0, T
A
= 25C
0.1
mA
I
OT
Thermal drift of I
O
- 10C .. + 70C
0.2 0.4
mA
t
r
Response time
1)
@ 90 % of I
PN
< 1
s
di/dt
di/dt accurately followed
> 50
A/s
f
Frequency bandwidth (- 1 dB)
DC .. 150
kHz
General data
T
A
Ambient operating temperature
- 10 .. + 70
C
T
S
Ambient storage temperature
- 25 .. + 85
C
R
S
Secondary coil resistance @ T
A
= 70C
130
m
Mass
45
g
Standards
2)
EN 50178
Notes :
1)
With a di/dt of 50 A/s
2)
A list of corresponding tests is available.
Features
Closed loop (compensated) current
transducer using the Hall effect
Insulated plastic case recognized
according to UL 94-V0.
Special features
I
P
= 0 .. 100 A
K
N
= 1 : 2000
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.
I
PN
= 50
A
991014/5
LEM Components
www.lem.com
Secondary terminals
Terminal + : supply voltage + 15 V
Terminal - : supply voltage - 15 V
Terminal M : measure
Terminal 0 : NC
Connection
Remarks
I
S
is positive when I
P
flows in the direction of the arrow.
Temperature of the primary conductor should not exceed
100C.
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.
To measure nominal currents of less than 50 A, the optimum
accuracy is obtained by having several primary turns (nomi-
nal current x number of turns < 50 At).
Mechanical characteristics
General tolerance
0.2 mm
Fastening
2 holes
3.2 mm
Primary through-hole
12.7 x 6.35 mm
Connection of secondary
Molex 5045-04/AG
Dimensions LA 50-S/SP1
(in mm. 1 mm = 0.0394 inch)
Front view
Top view
Left view
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
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