Current Transducer LA 35-NP
For the electronic measurement of currents : DC, AC, pulsed,
mixed, 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
35
1)
At
I
P
Primary current, measuring range
0 .. 70
At
R
M
Measuring resistance
R
M min
R
M max
with 15 V
@ 35 At
max
60
320
@ 70 At
max
60
85
I
SN
Secondary nominal r.m.s. current
35
mA
K
N
Conversion ratio
1-2-3-4-5 : 1000
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 mn
2.5
kV
V
b
R.m.s. rated voltage
2)
, safe separation
600
V
basic isolation
1700
V
Accuracy - Dynamic performance data
X
Accuracy @ I
PN
, T
A
= 25C
0.5
%
L
Linearity
< 0.2
%
Typ
Max
I
O
Offset current
3)
@ I
P
= 0, T
A
= 25C
0.10 0.20 mA
I
OM
Residual current
4)
@ I
P
= 0, after an overload of 3 x I
PN
0.05 0.15 mA
I
OT
Thermal drift of I
O
- 25C .. + 70C
0.15 0.50 mA
t
r
Response time
5)
@ 90 % of I
P max
< 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
- 25 .. + 70
C
T
S
Ambient storage temperature
- 40 .. + 85
C
R
P
Primary resistance per turn @ T
A
= 25C
< 1.25
m
R
S
Secondary coil resistance @ T
A
= 70C
80
R
IS
Isolation resistance @ 500 V, T
A
= 25C
> 1500
M
m
Mass
22
g
Standards
6)
EN 50178
Notes :
1)
In order to avoid over-heating, it is necessary that the recommended
primary connections be followed (see table page 2)
2)
Pollution class 2
3)
Measurement carried out after 15 mn functioning
4)
The result of the coercive field of the magnetic circuit
5)
With a di/dt of 100 A/s
6)
A list of corresponding tests is available
Features
Closed loop (compensated) multi-
range current transducer using the
Hall effect
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.
980909/1
I
PN
=
7-8-11-17-35
A
LEM Components
w w w .lem.com
Dimensions LA 35-NP
(in mm. 1 mm = 0.0394 inch)
Connection
Remarks
I
S
is positive when I
P
flows from terminals 1, 2, 3, 4, 5 to
terminals 10, 9, 8, 7, 6
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
10 pins 0.7 x 0.6 mm
Fastening & connection of secondary
3 pins
1 mm
Recommended PCB hole
1.2 mm
Right view
Bottom view
Top view
Secondary terminals
Terminal + : supply voltage + 15 V
Terminal M : measure
Terminal - : supply voltage - 15 V
in
out
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without previous notice.
5 4 3 2 1 IN
OUT
6 7 8 9 10
5 4 3 2 1 IN
OUT
6 7 8 9 10
5 4 3 2 1 IN
OUT
6 7 8 9 10
5 4 3 2 1 IN
OUT
6 7 8 9 10
5 4 3 2 1 IN
OUT
6 7 8 9 10
1
35
70
35
1
/
1000
0.3
0.023
2
17
34
34
2
/
1000
1.1
0.09
3
11
22
33
3
/
1000
2.5
0.21
4
8
16
32
4
/
1000
4.4
0.37
5
7
14
35
5
/
1000
6.3
0.58
N u m b e r
of primary
t u r n s
P r i m a r y c u r r e n t
n o m i n a l maximum
I
PN
[ A ] I
P
[ A ]
N o m i n a l
output current
I
SN
[ mA ]
T u r n s
r a t i o
K
N
P r i m a r y
r e s i s t a n c e
R
P
[ m
]
Primary insertion
i n d u c t a n c e
L
P
[ H ]
Recommended
c o n n e c t i o n s
Back view
swiss
Standard 00 Year Week
or N SP..
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