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2. INSTALLATION
2-5
2
(3) No-fuse breakers, magnetic contactors
No-Fuse Breaker
Magnetic Contactor
Capacity (K)
With power factor
improving reactor
Without power factor
improving reactor
With power factor
improving reactor
0.4 30AF/5A
0.75 30AF/10A
1.5 30AF/15A
S-N10
2.2 30AF/15A 30AF/20A S-N11, S-N12
3.7 30AF/30A S-N20
If the magnetic contactor does not have power factor improving reactor, select
the magnetic contactor as indicated in the following table depending on the
power equipment capacity and the wiring length from the power equipment to the
drive unit.
Power Supply
Capacity
Less than
50kVA
50kVA or More
Wiring length
20m or more 10m to 20m Less than 10m
0.4
0.75
S-N18 S-N21 S-N21
1.5 S-N21 S-N25 S-N50
2.2 S-N11, S-N12
Capacity
(K)
3.7 S-N20
(4) Earth leakage circuit breakers
Selection method
Use the earth leakage circuit breaker which has harmonic/surge suppression.
Our product: Progressive Super Series NV-SF, NV-CF
Earth Leakage Circuit Breaker
Capacity (K)
With power factor
improving reactor
Without power factor
improving reactor
0.4 30AF/5A
0.75 30AF/10A
1.5 30AF/15A
2.2 30AF/15A 30AF/20A
3.7 30AF/30A
MEMO
Leakage currents from the wiring and motor include frequency
components of a higher degrees than those from the commercial
power supply. Therefore, the earth leakage circuit breaker which is
not a harmonic/surge suppression product can cause unnecessary
operations.
<Measures against unnecessary operations>
•
Minimize the wiring distance of I/O cables.
•
Run I/O cables away (more than 30cm) from the earth.