Datasheet

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
60 150 Ω
@ ± 70 At
max
60 85 Ω
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 Typical accuracy @ I
PN,
T
A
= 25°C ± 0.5 %
ε
L
Linearity < 0.2 %
Typ Max
I
O
Offset current
3)
@ I
P
= 0, T
A
= 25°C ± 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
- 25°C .. + 70°C ± 0.15 ± 0.50 mA
t
r
Response time
5)
@ 90 % of I
PN
< 1 µs
di/dt di/dt accurately followed > 50 A/µs
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
= 25°C < 1.25 mΩ
R
S
Secondary coil resistance @ T
A
= 70°C 80 Ω
R
IS
Isolation resistance @ 500 V, T
A
= 25°C > 1500 MΩ
m Mass 22 g
Standards EN 50178 : 1997
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/µs.
Features
• Closed loop (compensated) multi-
range 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.
060719/4
I
PN
= 7-8-11-17-35 A
LEM Components www.lem.com
16136