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PDF LF305-S Data sheet ( Hoja de datos )
| Número de pieza | LF305-S | |
| Descripción | Current Transducer LF 305-S | |
| Fabricantes | LEM | |
| Logotipo |  |
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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).
Preliminary
IPN = 300 A
Electrical data
IPN Primary nominal r.m.s. current
IP Primary current, measuring range
RM Measuring resistance
with ± 12 V
with ± 15 V
with ± 20 V
@ ± 300 A max
@ ± 500 A max
@ ± 300 A max
@ ± 500 A max
@ ± 300 A max
@ ± 500 A max
ISN Secondary nominal r.m.s. current
K N Conversion ratio
VC Supply voltage (± 5 %)
IC Current consumption
Vd R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
300
0 .. ± 500
A
A
RM min
0
0
0
0
15
15
RM max
39
12
58
22
93
45
Ω
Ω
Ω
Ω
Ω
Ω
150 mA
1 : 2000
± 12 .. 20
V
16 (@ ±20V) + IS mA
3 kV
Accuracy - Dynamic performance data
εX G
L
IO
IOM
IOT
tra
tr
di/dt
f
Overall accuracy @ IPN , TA = 25°C
Linearity
± 0.4
< 0.1
%
%
Offset current @ IP = 0, TA = 25°C
Residual current 1) @ IP = 0, after an overload of 3 x IPN
Thermal drift of IO
- 10°C .. + 70°C
Reaction time @ 10 % of IPN
Response time 2) @ 90 % of IPN
di/dt accurately followed
Frequency bandwidth (- 1 dB)
Typ Max
± 0.20
± 0.08
± 0.1 ± 0.30
mA
mA
mA
< 500
<1
> 100
DC .. 100
ns
µs
A/µ s
kHz
General data
TA Ambient operating temperature
TS Ambient storage temperature
R S Secondary coil resistance @ TA = 70°C
m Mass
Standards 3)
- 10 .. + 70
- 25 .. + 85
28
95
EN 50178
°C
°C
Ω
g
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.
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.
Notes : 1) The result of the coercive field of the magnetic circuit
2) With a di/dt of 100 A/µs
3) A list of corresponding tests is available
LEM Components
991125/1
w w w .lem.com
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