LF305-S Datasheet, PDF (1/2 Pages) LEM – Current Transducer LF 305-S

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
I_PN = 300 A
Electrical data
I_PN
Primary nominal r.m.s. current
I_P
Primary current, measuring range
R_M 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
I_SN
Secondary nominal r.m.s. current
K _N Conversion ratio
V_C
Supply voltage (± 5 %)
I_C
Current consumption
V_d
R.m.s. voltage for AC isolation test, 50 Hz, 1 mn
300
A
0 .. ± 500
A
R_{M min}
0
0
0
0
15
15
R_{M max}
39
Ω
12
Ω
58
Ω
22
Ω
93
Ω
45
Ω
150
mA
1 : 2000
± 12 .. 20
V
16 (@ ±20V) + I_S mA
3
kV
Accuracy - Dynamic performance data
εX G
L
I_O
I_OM
I_OT
t_ra
t_r
di/dt
f
Overall accuracy @ I_PN , T_A = 25°C
Linearity
± 0.4
%
< 0.1
%
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)
Typ Max
± 0.20 mA
± 0.08 mA
± 0.1 ± 0.30 mA
< 500
<1
> 100
DC .. 100
ns
µs
A/µ s
kHz
General data
T_A
Ambient operating temperature
T_S
Ambient storage temperature
R_S
Secondary coil resistance @ T_A = 70°C
m
Mass
Standards ³⁾
- 10 .. + 70
°C
- 25 .. + 85
°C
28
Ω
95
g
EN 50178
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
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