13
Application and precautions of peripherals
Power Source
l Ensure to apply power source at correct rated voltage to prevent
form damaging the inverter.
l Circuit breaker must be installed in between the AC power supply
and the inverter.
Moulded-case circuit breaker (MCCB)
l Utilize appropriate circuit breaker suitable for the rated voltage
and current ratings of the inverter to switch ON/OFF the power
supply to the inverter and as a protection for the inverter.
l Do not operate the circuit breaker to switch ON or OFF the
inverter.
Earth leakage circuit breaker (Residual current device)
l Leakage circuit breaker should be added to prevent false
operation cause by leakage current and to ensure personnel
safety.
Magnetic Contact
l The Magnetic Contact can be omitted at ordinary operation. To
utilize external control, automatic restart, or breaking controller
the magnetic contact must be added at the primary side.
l Do not operate the magnetic contact to switch ON or OFF the
inverter.
Power improvement AC Reactor
l If large capacity power source is applied (over 600kVA),
additional AC reactor may be added to improve power factor.
Inverter
l Power supply input terminals L1 and L2 is not differentiated on
phase sequence, they can be arbitrarily connected. Their
connection may be exchanged.
l Output terminal T1, T2, and T3 should be connected to the U, V,
and W terminals of the motor respectively. If motor turns in
opposite direction of the inverter, simply exchanging two of three
wire connection may correct this problem.
l Output terminal T1, T2, and T3 must not be connected to power
source to prevent from damaging inverter.
l Grounding terminal. Properly ground the grounding terminal in
compliance to local codes
Power supply
Moulded-case
circuit breaker
or ground fault
interruptor
Electrical-
magnetic
contactor
AC reactor
for power
factor
improvement
VAT20
Inverter
Motor
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