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
16019
Electrical data
I
PN
I
PM
R
M
Primary nominal current rms
Primary current, measuring range
Measuring resistance @
with ± 12 V
with ± 15 V
I
SN
K
N
V
C
I
C
V
d
@ ± 50 A
maxi
@ ± 70 A
maxi
@ ± 50 A
maxi
@ ± 70 A
maxi
50
0 .. ± 70
T
A
= 70°C
T
A
= 85°C
R
M mini
R
M maxi
R
M mini
R
M maxi
10
10
50
50
100
50
160
90
60 95
60
1)
60
1)
135 155
135
2)
135
2)
A
A
Features
•
Closed loop (compensated) current
transducer using the Hall effect
•
Printed circuit board mounting
•
Isolated plastic case recognized
according to UL 94-V0.
Ω
Ω
Ω
Ω
Secondary nominal current rms
Conversion ratio
Supply voltage (± 5 %)
Current consumption
Rms voltage for AC isolation test, 50 Hz, 1 min
50
mA
1 : 1000
± 12 .. 15
V
10
(@ ± 15 V) +
I
S
mA
2.5
kV
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.
Accuracy - Dynamic performance data
X
Accuracy @
I
PN
,
T
A
= 25°C
L
ε
@ ± 15 V (± 5 %)
@ ± 12 .. 15 V (± 5 %)
Linearity error
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
0°C .. + 70°C
- 25°C .. + 85°C
Reaction time @ 10 % of
I
PN
Response time @ 90 % of
I
PN
Step
di/dt accurately followed
Frequency bandwidth (- 1 dB)
± 0.65
± 0.90
< 0.15
Typ
Maxi
± 0.2
± 0.3
± 0.5
± 0.6
%
%
%
mA
mA
mA
mA
ns
µs
A/µs
kHz
I
O
I
OM
I
OT
t
ra
t
r
di/dt
BW
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.
± 0.1
± 0.1
< 500
<1
> 200
DC .. 200
General data
T
A
T
S
R
S
m
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @
Mass
Standards
1)
2)
3)
T
A
= 70°C
T
A
= 85°C
- 25 .. + 85
- 40 .. + 90
80
85
18
EN 50178: 1997
°C
°C
Ω
Ω
g
Application Domain
•
Industrial.
Notes:
Measuring range limited to ± 60 A
maxi
Measuring range limited to ± 55 A
maxi
Result of the coercive field of the magnetic circuit.
page 1/2
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
070103/11
w w w .lem.com
Dimensions LA 55-P
(in mm. 1 mm = 0.0394 inch)
Left view
Bottom view
Model + N° SP
Connection
Front view
Mechanical characteristics
•
General tolerance
•
Primary through-hole
•
Fastening & connection of secondary
Recommended PCB hole
± 0.2 mm
12.7 x 7 mm
3 pins
0.63 x 0.56mm
0.9 mm
Safety
This transducer must be used in electric/electronic
equipment with respect to applicable standards and
safety requirements in accordance with the
manufacturer's operating instructions.
Remarks
•
I
S
is positive when
I
P
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.
070103/11
Caution, risk of electrical shock
When operating the transducer, certain parts of the module
can carry hazardous voltage (eg. primary busbar, power
supply).
Ignoring this warning can lead to injury and/or cause
serious damage.
This transducer is a built-in device, whose conducting
parts must be inaccessible after installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.
page 2/2
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
w w w .lem.com
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