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Current Transducer LF 205-S
For the electronic measurement of currents: DC, AC, pulsed...,
with galvanic separation between the primary circuit and the secondary
circuit.
I PN = 200 A
I PN
I PM
R M
I SN
K N
U C
I C
Electrical data
Primary nominal rms current
Primary current, measuring range
Measuring resistance @
with ± 12 V @ ± 200 A max
@ ± 420 A max
with ± 15 V @ ± 200 A max
@ ± 420 A max
Secondary nominal rms current
Conversion ratio
Supply voltage (+ 5 %)
Current consumption @ ± 15 V
200
0 .. ± 420
T A = 70 °C T A = 85 °C
R M min R M max R M min R M max
0 71 0 69
0 14 0 12
0 100 23 98
0 28 23 26
100
1 : 2000
± 12 .. 15
17 + I S
A
A
?
?
?
?
mA
V
mA
Features
● Closed loop (compensated)
current transducer using the Hall
effect
● Insulating 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
Accuracy - Dynamic performance data
●
High immunity to external
interference
X G
ε L
Overall accuracy @ I PN , T A = 25 °C
Linearity error
± 0.5
< 0.1
Typ
Max
%
%
● Current overload capability.
Applications
I O
I OM
I OT
t ra
t r
d i/ d t
BW
Offset current @ I P = 0, T A = 25 °C
Magnetic offset current 1) @ I P = 0 and specified R M ,
after an overload of 3 x I PN
Temperature variation of I O - 40 °C .. + 85 °C
Reaction time to 10 % of I PN step
Response time 2) to 90 % of I PN step
d i /d t accurately followed
Frequency bandwidth (- 3 dB)
± 0.2
± 0.1
± 0.12 ± 0.4
< 500
< 1
> 100
DC .. 100
mA
mA
mA
ns
μs
A/μs
kHz
● 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
General data
(SMPS)
● Power supplies for welding
T A
T S
R S
m
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance
Mass
@ T A = 70 °C
@ T A = 85 °C
- 40 .. + 85
- 40 .. + 90
33
35
78
°C
°C
?
?
g
applications.
Application domain
● Industrial.
Standard
EN 50178: 1997
Notes :
1)
2)
The result of the coercive force (Hc) of the magnetic circuit
With a d i /d t of 100 A/μs.
No 97.14.44.000.0
Page 1/3
8June2013/version 17
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice
www.lem.com
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