Current Transducer LF 305-S
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
=
300 A
Preliminary
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
with ± 20 V
I
SN
K
N
V
C
I
C
V
d
@ ± 300 A
max
@ ± 500 A
max
@ ± 300 A
max
@ ± 500 A
max
@ ± 300 A
max
@ ± 500 A
max
300
0 .. ± 500
R
M min
R
M max
0
0
0
0
15
15
39
12
58
22
93
45
A
A
Ω
Ω
Ω
Ω
Ω
Ω
Features
•
Closed loop (compensated) 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.
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
150
mA
1 : 2000
± 12 .. 20
V
16
(@ ± 20 V)
+
I
S
mA
3
kV
Accuracy - Dynamic performance data
X
G
ε
L
Overall accuracy @
I
PN
,
T
A
= 25°C
Linearity
Offset current @
I
P
= 0,
T
A
= 25°C
Residual current
1)
@
I
P
= 0, after an overload of 3 x
I
PN
Thermal drift of
I
O
- 10°C .. + 70°C
Reaction time @ 10 % of
I
PN
Response time
2)
@ 90 % of
I
PN
di/dt accurately followed
Frequency bandwidth (- 1 dB)
± 0.4
< 0.1
Max
± 0.20
± 0.08
± 0.1 ± 0.30
< 500
<1
> 100
DC .. 100
Typ
%
%
mA
mA
mA
ns
µs
A/µs
kHz
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.
I
O
I
OM
I
OT
t
ra
t
r
di/dt
f
General data
T
A
T
S
R
S
m
Ambient operating temperature
Ambient storage temperature
Secondary coil resistance @
T
A
= 70°C
Mass
Standards
3)
- 10 .. + 70
- 25 .. + 85
28
95
EN 50178
°C
°C
Ω
g
Notes :
1)
2)
3)
The result of the coercive field of the magnetic circuit
With a di/dt of 100 A/µs
A list of corresponding tests is available
991125/1
LEM Components
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