Current Transducer LA 125-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
=
125 A
16030
Electrical data
I
PN
I
P
R
M
Primary nominal r.m.s. current
Primary current, measuring range
Measuring resistance @
with ± 12 V
with ± 15 V
I
SN
K
N
V
C
I
C
V
d
@ ± 125 A
max
@ ± 200 A
max
@ ± 125 A
max
@ ± 200 A
max
125
0 .. ± 200
T
A
= 70°C
T
A
= 85°C
R
M min
R
M max
R
M min
R
M max
5
5
25
25
52
20
74
34
14
14
40
40
1)
50
18
72
40
1)
A
A
Features
•
Closed loop (compensated) current
transducer using the Hall effect
•
Printed circuit board mounting
•
Insulated plastic case recognized
according to UL 94-V0.
Ω
Ω
Ω
Ω
Secondary nominal r.m.s. current
Conversion ratio
Supply voltage (± 5 %)
Current consumption
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
125
mA
1 : 1000
± 12 .. 15
V
16
(@ ± 15 V) +
I
S
m A
3
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
Residual current
2)
@
I
P
= 0, after an overload of 3 x
I
PN
Thermal drift of
I
O
0°C .. + 70°C
- 40°C .. + 85°C
Reaction time @ 10 % of
I
PN
Response time
3) 4)
@ 90 % of
I
PN
di/dt accurately followed
4)
Frequency bandwidth
4)
(- 1 dB)
± 0.60
± 0.80
< 0.15
Max
± 0.40
± 0.50
± 0.15 ± 0.50
± 0.30 ± 0.95
< 500
<1
> 200
DC .. 100
Typ
%
%
%
mA
mA
mA
mA
ns
µs
A/µs
kHz
I
O
I
OM
I
OT
t
ra
t
r
di/dt
f
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.
General data
T
A
T
S
R
S
m
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @
Mass
Standards
1)
2)
3)
4)
T
A
= 70°C
T
A
= 85°C
- 40 .. + 85
°C
- 40 .. + 90
°C
32
Ω
33.5
Ω
40
g
EN 50178 : 1997
Notes :
Measuring range limited to ± 180 A
max
The result of the coercive field of the magnetic circuit.
With a di/dt of 100 A/µs
The primary conductor is best filling the through-hole and/or the return
of the primary conductor is above the top of the transducer.
060213/10
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
page 1/2
LEM
w w w .lem.com
Dimensions LA 125-P
(in mm. 1 mm = 0.0394 inch)
Bottom view
Left view
Model + SP N°
Date Code
Connection
Front view
Mechanical characteristics
•
General tolerance
± 0.2 mm
•
Primary through-hole
17 x 11 mm
•
Fastening & connection of secondary 4 pins 0.63 x 0.56 mm
Recommended PCB hole
•
Supplementary fastening
Recommended PCB hole
Recommended screws
Fastening torque, max.
0.9 mm
2 holes
∅
1.75 mm
2.4 mm
PT K A 22 x 6
0.5 Nm or .37 Lb. - Ft.
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 primary bar in low position in the through-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.
060213/10
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
page 2/2
LEM
w w w .lem.com
Microchip MCU
京公网安备 11010802033920号
EEWORLD
