Mitsubishi Electric FR-E540 K-EC Series Instruction Manual page 49

Progressive Super Series (Type SP, CF, SF, CP)
Rated sensitivity current: I n
Conventional NV series (Type CA, CS, SS produced prior to '91)
Rated sensitivity current: I n
lg1, lg2 : Leakage currents of cable path during commercial power supply operation
lgn* : Leakage current of noise filter on inverter input side
lgm : Leakage current of motor during commercial power supply operation
<Example>
Note: 1. The earth leakage circuit breaker should be installed to the primary (power
supply) side of the inverter.
2. Ground fault in the secondary side of the inverter can be detected at the
running frequency of 120Hz or lower.
3. In the connection neutral point grounded system, the sensitivity current
becomes worse for ground fault in the inverter secondary side. Hence, the
protective grounding of the load equipment should be class D grounding (10
or less).
4. When the breaker is grounded on the secondary side of the inverter, it may be
unnecessarily operated by harmonics if the effective value is less than the
rating. In this case, note that the eddy current and hysteresis loss increase
and temperature rises.
* For the leakage current value of the noise filter installed on the inverter input
side, contact the corresponding filter manufacturer.
Leakage current (Ig1)
Leakage current (Ign)
Leakage current (Ig2)
Motor leakage
current (Igm)
Total leakage current
Rated sensitivity current
( Ig 10)
10 (lg1+Ign+lg2+lgm)
10 {lg1+lgn+3 (lg2+lgm)}
5.5mm 2 5m 5.5mm 2 70m
NV Noise filter
Inverter
IM
Ig1 Ign Ig2
Progressive Super Series
(Type SP, CF, SF,CP)
0 (without noise filter)
2.66
30
41
INSTALLATION AND WIRING
3
200V 2.2kW
Igm
Conventional NV
(Type CA, CS, SS)
5m
33 = 0.17
1000m
70m
33 = 2.31
1000m
0.18
7.64
100