Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 117)

PC NC Maintenance Manual The VS-626M5
4-96
Wiring The Main Circuit
1. Wiring Precautions for Main Circuit Input
Installation of Molded-case Circuit Breaker (MCCB)
Connect the MCCB between the main circuit power supply input and VS-
656MR5 input terminals R/L1, S/L2 and T/L3 to protect the wiring.
Installation of Ground Fault Interrupter
When connecting a ground fault interrupter to input terminals R/L1, S/L2
and T/L3, 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)
Installation of Magnetic Contactor
When the main circuit power supply is shut OFF in the sequence, a mag-
netic contactor (MC) can be used instead of a molded-case circuit breaker
(MCCB). However, when a magnetic contactor is switched OFF at the
main circuit power supply input side, regenerative braking does not func-
tion and the motor coasts to a stop. (At this time, a protective function acti-
vates to display a fault.)
Frequent opening/closing of the magnetic contactor at the main circuit
power supply input side may cause the inverter and the converter to mal-
function.
Main circuit power supply input phases can be connected to any terminal
regardless of the order of R/L1, S/L2 and T/L3 on the terminal block.
• Ensure the ground terminal is grounded.
• Never connect the AC main circuit power supply to output terminals U/T1, V/T2 and
W/T3. The inverter may be damaged.
WARNING
CAUTION