User`s manual

FP5/GP5 User’s Manual 21
Main Circuit Wiring
Input Wiring
·Molded-Case Circuit Breaker (MCCB)
Be sure to connect MCCBs or fuses between the AC main circuit power
supply and FP5/GP5 input terminals L1, L2 and L3, to protect the
power supply wiring.
·Ground Fault Interrupter
When connecting a ground fault interrupter to input terminals L1, L2
and L3, select one that is not affected by high frequency.
Examples: NV series by Mitsubishi Electric Co., Ltd. (manufactured
in or after 1988), EGSG series by Fuji Electric Co., Ltd.
(manufactured in or after 1984).
·Magnetic Contactor (MC)
Inverters can be used without an MC installed on the power supply side.
An MC can be used instead of an MCCB to apply the main circuit
power supply. However, when an MC is switched OFF on the primary
side, dynamic braking does not function and the motor coasts to stop.
The load can be operated/stopped by closing/opening the MC on the
primary side. However, frequent switching may cause the inverter to
malfunction.
When using a braking resistor unit, use an MC to break the power supply
side of the inverter in the event of a dynamic braking overload relay trip.
Otherwise, if the inverter malfunctions, the braking resistor unit may be
burned out.
·Terminal Block Connection Sequence
Input power supply phases can be connected to any terminal regardless
of the order of L1, L2 and L3 on the terminal block.
·AC Reactor
When connecting an inverter (230V/460V, 25HP or less) to a large capac-
ity power supply transformer (600kVA or more), or when switching a
phase-advancing capacitor, excessive peak current flows through the input
power supply circuit, which may damage the converter section. In such
cases, install a DC reactor (optional) between inverter ⊕1 and ⊕2 termi-
nals, or an AC reactor (optional) on the input side. Installation of a reactor
is also effective for improving power factor on the power supply side.
Chapter 1 - Receiving & Installation
Wiring
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