Filter
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2. INSTALLATION
2-8
Setting of rated current sensitivity
Rated current sensitivity
≥
10 {lg1 + lgn + K (lg2 + lgm)}
K: Constant in consideration of harmonics
Earth Leakage Circuit Breaker
Type Our product
K
Harmonic/surge
suppression product
NV-SF
NV-CF
1
NV
Ig1 Ign Ig2 Igm
M
Drive unit
Noise
filter
General product
NV-CA
NV-CS
NV-SS
3
lg1: Leakage current in cable path between earth leakage circuit breaker and drive unit (see Fig. 2-2)
lg2: Leakage current in cable path between drive unit and motor (see Fig. 2-2)
0
20
40
60
80
100
120
23.5
5.5
81422
30
38
60
80
100
150
(200V 60Hz)
Fig. 2-2 Example of Leakage Current per 1km of Cable Path
When CV Cable Is Routed in Metal Conduit
Wire size (mm )
Leakage current (mA)
2
lgn: Leakage current of filter connected on input side
Refer to Chapter 7, 7.1.3 Option list for our dedicated filters.
lgm: Leakage current of motor
Capacity (K)
Leakage Current (mA)
0.5, 1.0 0.1
1.5, 2.0 0.2
3.5 0.3
NOTICE
Install the leakage current circuit breaker on the input side (power supply side) of
the drive unit.
Installation on the output side will cause the earth leakage circuit breaker to
overheat or malfunction.
MEMO
A leakage current may flow into the other lines through the ground cables, etc.