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Installation
D Installing a Magnetic Contactor
If the power supply for the main circuit is to be shut off because of the sequence, a magnetic contactor
can be used instead of a molded-case circuit breaker.
When a magnetic contactor is installed on the primary side of the main circuit to forcibly stop a load,
however, the regenerative braking does not work and the load coasts to a stop.
• The load can be run or stopped by switching the magnetic contactor in the primary side. Frequent
switching of the contactor, however, may result in Inverter troubles. It is recommended that switching
be limited to once half an hour, considering the life of electrolytic capacitors or relay contacts inside the
Inverter.
• When the Inverter is operated with the Digital Operator, automatic operation cannot be performed af-
ter recovery from a power interruption.
• If the Braking Resistor Unit is to be used, program the sequence so that the magnetic contactor is
turned off by the contact of the Unit's thermal relay.
D Connecting Input Power Supply to the Terminal Block
Input power supply can be connected to any terminal on the terminal block because the phase se-
quence of input power supply is irrelevant to the phase sequence (L1, L2, and L3).
D Installing an AC Reactor
If the Inverter is connected to a large-capacity power transformer (600 kW or more) or the phase ad-
vance capacitor is switched, an excessive peak current may flow through the input power circuit, caus-
ing the converter unit to break down. To prevent this, install an optional AC reactor on the input side of
the Inverter. This also improves the power factor on the power supply side.
D Installing a Surge Absorber
Always use a surge absorber or diode for the inductive loads near the Inverter. These inductive loads
include magnetic contactors, electromagnetic relays, solenoid valves, solenoids, and magnetic brakes.
D Wiring the Power Terminal of the Inverter with 18.5- to 160-kW Output
• For 400-V class, 18.5 to 45 kW, connect the r and s terminals to the L1 (R) and L2 (S) terminals respec-
tively. (These are shorted by short bars for shipping.)
• For 400-V class, 55 to 160 kW, connect the r and s 400 terminals to the L1 (R) and L2 (S) terminals
respectively. (These are shorted by short bars for shipping.)
D Wiring the Power Terminal of the Inverter with 3G3HV Series with 18.5- to 160-kW
Output
Refer to the following to wire terminals R, S, T, R1, S1, and T1.
D Three-phase Power Input
Make sure that terminals R and R1, S and S1, and T and T1 are short-circuited before supplying
power to the Inverter. These terminals are short-circuited with short bars before shipping.
The Inverter may break down if only terminals R, S, and T or terminals R1, S1, and T1 are supplied
with power.
D 12-pulse Rectification
Terminals R and R1, S and S1, and T and T1 are short-circuited with short bars before shipping. Be
sure to remove the short bars when using 12-pulse rectification, otherwise the Inverter will break
down.
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Chapter 2
2-33
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