Mitsubishi FR - S500 instruction manual Power-off and magnetic contactor MC, Off, Stf Str

1.5.5 Power-off and magnetic contactor (MC)

CAUTION

Do not use the inverter power supply side magnetic contactor to start or stop the inverter.

As shown on the right, always use the start signal (ON or OFF across terminals STF or STR-SD) to make a start or stop. (Refer to page 28)

NFB

Power supply

F

OFF

MC

MC

R<L1> U

S<N> V To motor

T W

		B
ON		OFF
	MC
MC		C

ON Inverter

OFF

RA

RA

RA

STF (STR)

SD

Inverter Start/Stop Circuit Example

(1) Inverter's primary side magnetic contactor (MC)

On the inverter's primary side, it is recommended to provide an MC for the following purposes (Refer to page 13 for selection.):

1)To release the inverter from the power supply when the inverter's protective function is activated or when the drive is not functioning (e.g. emergency stop

operation).

2) To prevent an accident caused by an automatic restart made at power restoration 1 after an inverter stop due to a power failure.

3)To rest the inverter for a long time.

The control power supply for inverter is always running and consumes a little power. When stopping the inverter for a long time, switching inverter power off saves power slightly.

4)To separate the inverter from the power supply to ensure safety of maintenance/inspection work.

As the inverter's primary MC is used for the above purposes, it is equivalent to the standard duty and select the one of class JEM1038-AC3 for the inverter input side current.

17