LF305-S_11 Datasheet, PDF (1/3 Pages) LEM – Current Transducer

Current Transducer LF 305-S
For the electronic measurement of currents: DC, AC, pulsed...,
with galvanic isolation between the primary circuit (high power)
and the secondary circuit (electronic circuit).
I_PN = 300 A
16167
Electrical data
I_PN
Primary nominal current rms
I_PM
Primary current, measuring range
R_M
Measuring resistance @

with ± 12 V @ ± 300 A _max
@ ± 500 A _max
with ± 15 V @ ± 300 A _max
@ ± 500 A _max
with ± 20 V @ ± 300 A _max
@ ± 500 A _max
I_SN
Secondary nominal current rms
K_N
Conversion ratio
V_C
Supply voltage (± 5 %)
I_C
Current consumption
300
A
0 .. ± 500
A
T_A = 70°C
R R _{M min M max}
0
37
T_A = 85°C
R R _{M min M max}
0 35 Ω
0
10 0 8 Ω
0
56 0 54 Ω
0
21 0 19 Ω
0
88 0 86 Ω
0
40 0 38 Ω
150
mA
1 : 2000
± 12 .. 20
V
26 (@± 20V)+ I_S mA
Accuracy - Dynamic performance data
XεG
L
I_O
I_OM
I_OT
t_ra
t_r
di/dt
BW
Overall accuracy @ I_PN , T_A = 25°C
Linearity error
± 0.5
< 0.1

Typ Max
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 ± 0.2

- 10°C .. + 70°C ± 0.1
± 0.2
± 0.2
± 0.7
± 0.3
Reaction time to 10 % of I_PN
Response time ²⁾ to 90 % of I_PN step
di/dt accurately followed
< 500
< 1
> 100
Frequency bandwidth (- 1 dB)
DC .. 100
%
%
mA
mA
mA
mA
ns
µs
A/µs
kHz
General data
T_A
Ambient operating temperature
T_S
Ambient storage temperature
R_S
Secondary coil resistance @ T_A = 70°C
T_A = 85°C
m
Mass
Standards
- 40 .. + 85
°C
- 40 .. + 85
°C
30
Ω
32
Ω
95
g
EN 50178:1997
Features
●● Closed loop (compensated)
current transducer using the Hall
effect
●● Isolated 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.
Application domains
●● Industrial.
Notes:¹⁾ The result of the coercive field of the magnetic circuit
2) _{With a di/dt of 100 A/µs.}
110210/11
LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice.
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