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3.3 WIRING THE MAIN CIRCUIT
WARNING
S Make sure to ground the ground terminal .
(Ground resistance 200V class: 100Ω or less, 400V class: 10Ω or less)
Failure to observe this warning can result in an electric shock or a fire.
CAUTION
S Never connect the AC main circuit power supply to output terminals U, V and W.
The inverter will be damaged and invalidate the guarantee.
S (Standard connection)
Be sure to connect the motor leads to the correct output terminals:
Motor lead U to output terminal U,
Motor lead V to output terminal V, and
Motor lead W to output terminal W.
Failure to observe this caution may cause the motor to run unusual way such as in reverse.
S With the standard connection for the output terminals, the motor rotates counterclock-
wise as viewed from the load side in a forward operation. To rotate the motor clockwise
in a forward operation, connect the output terminals as refered in Appendix 6.
(1) Wiring Precautions for Main Circuit Input
(a) Installation of Molded-case Circuit Breaker (MCCB)
Make sure to connect MCCBs or fuses between the AC main circuit power supply and
VS-686SS5 input terminals R, S and T to protect wiring.
(b) Installation of Ground Fault Interrupter
When connecting a ground fault interrupter to input terminals R, S and T, select one that
is not affected by high frequency.
Examples: NV series by Mitsubishi Electric Co., Ltd. (manufactured in or after1988),
EG, SG series by Fuji Electric Co., Ltd. (manufactured in or after 1984)
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