INSTALLATION AND WIRING
44
<Example>
Ig1 Ign Ig2 Igm
5.5mm
2
×
5m
(16.40 feet)
5.5mm
2
×
70m
(229.66 feet)
IM
3
φ
200V 2.2kW
3HP
Inverter
NV
Noise filter
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 faults in the inverter secondary side. Hence, the
protective grounding of the load equipment should be 10
Ω
or less.
4. When the breaker is installed in 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, do not install the breaker since the eddy current and
hysteresis loss increase and the temperature rises.
* Note the leakage current value of the noise filter installed on the inverter input
side.
Progressive Super series
(Type SP, CF, SF, CP)
Conventional NV
(Type CA, CS, SS)
5m (16.40 feet )
Leakage current (Ig1) (mA) 33
×
1000m (3280.80 feet)
= 0.17
Leakage current (Ign) (mA) 0 (without noise filter)
70m (229.66 feet )
Leakage current (Ig2) (mA) 33
×
1000m (3280.80 feet)
= 2.31
Motor leakage
current (Igm) (mA)
0.18
Total leakage current (mA) 2.66 7.64
Rated sensitivity current
(mA) (
≥
Ig
×
10)
30 100
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