Mitsubishi Electric F700 Instruction Manual download pdf (Page 31)

Power-off and magnetic contactor (MC)

2.5 Power-off and magnetic contactor (MC)

(1) Inverter input side magnetic contactor (MC)

On the inverter input side, it is recommended to provide an MC for the following purposes.

( Refer to page 3 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 any accident due to an automatic restart at restoration of power after an inverter stop made by a

power failure

3)The control power supply for inverter is always running and consumes a little power. When stopping the inverter

for an extended period of time, powering off the inverter will save power slightly.

4)To separate the inverter from the power supply to ensure safe maintenance and inspection work

The inverter's input side MC is used for the above purpose, select class JEM1038-AC3MC for the inverter input

side current when making an emergency stop during normal operation.

(2) Handling of the inverter output side magnetic contactor

Switch the magnetic contactor between the inverter and motor only when both the inverter and motor are at a stop.

When the magnetic contactor is turned on while the inverter is operating, overcurrent protection of the inverter and

such will activate. When an MC is provided to switch to a commercial power supply, for example, it is recommended

to use commercial power supply-inverter switchover operation Pr. 135 to Pr. 139 ( Instruction Manual (applied)).

REMARKS

The MC may be switched on/off to start/stop the inverter. However, since repeated inrush currents at power on will shorten the

life of the converter circuit (switching life is about 1,000,000 times. (For the 200V class 37K or more, switching life is about

500,000)), frequent starts and stops must be avoided. Turn on/off the inverter start controlling terminals (STF, STR) to run/stop

the inverter.

• Inverter start/stop circuit example

As shown on the left, always use the start

signal (ON or OFF across terminals STF or

STR-SD) to make a start or stop.

*1 When the power supply is 400V class, install a

step-down transformer.

*2 Connect the power supply terminals R1/L11, S1/

L21 of the control circuit to the primary side of

the MC to hold an alarm signal when the

inverter's protective circuit is activated. At this

time, remove jumpers across terminals R/L1-

R1/L11 and S/L2-S1/L21. (Refer to page 20 for

removal of the jumper.)

Power

supply

MCCB

To the

motor

Inverter

STF(STR)

T *1

R/L1

S/L2

T/L3

R1/L11

S1/L21

OFF

Stop

Operation

Operation preparation

Start/Stop

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Mitsubishi Electric F700 Instruction Manual Page 31

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