Current Transducer LA 55-TP
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 .. 70
A
R
M
Measuring resistance @
T
A
= 70C
T
A
= 85C
R
M min
R
M max
R
M min
R
M max
with 12 V
@ 50 A
max
10 100
60
95
@ 70 A
max
10
50 60
1)
60
1)
with 15 V
@ 50 A
max
50 160 135 155
@ 70 A
max
50
90 135
2)
135
2)
I
SN
Secondary nominal r.m.s. current
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
V
d
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
2
kV
V
b
R.m.s. rated voltage
60
V
Accuracy - Dynamic performance data
X
Accuracy @ I
PN
, T
A
= 25C
@ 15 V ( 5 %)
0.65
%
@ 12 .. 15 V ( 5 %)
0.90
%
L
Linearity
< 0.15
%
Typ
Max
I
O
Offset current @ I
P
= 0, T
A
= 25C
0.2
mA
I
OM
Residual current
3)
@ I
P
= 0, after an overload of 3 x I
PN
0.3
mA
I
OT
Thermal drift of I
O
0C .. + 70C
0.1 0.5
mA
- 25C .. + 85C
0.1 0.6
mA
t
ra
Reaction time @ 10 % of I
P max
< 500
n s
t
r
Response time
4)
@ 90 % of I
P max
< 1
s
di/dt
di/dt accurately followed
> 200
A/s
f
Frequency bandwidth (- 1 dB)
DC .. 200
kHz
General data
T
A
Ambient operating temperature
- 25 .. + 85
C
T
S
Ambient storage temperature
- 40 .. + 90
C
R
S
Secondary coil resistance @
T
A
= 70C
80
T
A
= 85C
85
m
Mass
24
g
Standards
5)
EN 50178
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)
With a di/dt of 100 A/s
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.
I
PN
=
50
A
980706/4
LEM Components
w w w .lem.com
Secondary terminals
Terminal + : supply voltage + 12 .. 15 V
Terminal - : supply voltage - 12 .. 15 V
Terminal M : measure
Connection
Remarks
I
S
is positive when I
P
flows in the direction of the arrow.
Temperature of the primary conductor should not exceed
90C.
This is a standard model. For different versions (supply
voltages, turns ratios, unidirectional measurements...),
please contact us.
Mechanical characteristics
General tolerance
0.2 mm
Fastening & connection of primary
bus bar
6.4 x 1.6 mm
Recommended PCB hole
3.8 mm
Fastening & connection of secondary
3 pins
0.63 x 0.56 mm
Recommended PCB hole
0.9 mm
Dimensions LA 55-TP
(in mm. 1 mm = 0.0394 inch)
Bottom view
Front view
Left view
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
Standard 00
Year Week
or N SP..
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