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10.2 Installation of a magnetic contactor
If using the inverter without installing a magnetic contactor (MC) in the primary circuit, use an MCCB (with a power cutoff device) to open the primary circuit when the inverter protective circuit is activated.
If using a braking resistor or braking resistor unit, install a magnetic contactor (MC) or
■Magnetic contactor in the primary circuit
A magnetic contactor installed in the power supply circuit of the inverter cuts off the power supply to the cir- cuit and prevents the inverter from restarting in case of a power failure, a trip of the overload relay
In addition, if the FL contact of the failure detection relay in the
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| |
MCCB | MC |
|
| R/L1 | U/T1 |
Power supply | S/L2 | W/T2 |
| T/L3 | W/T3 |
| FLC |
|
| FLB | F |
| MC | |
| FLA | R |
| Surge killer | |
|
| |
|
| CC |
Thermal relay Motor
IM |
Forward run
Reverse run
Example of connection of a magnetic contactor in the primary circuit | 10 |
Notes on wiring |
•When frequently switching between start and stop, do not use the magnetic contactor on the primary side as an
•Be sure to attach a surge killer to the exciting coil of the magnetic contactor (MC).
■Magnetic contactor in the secondary circuit
A magnetic contactor may be installed on the secondary side to switch controlled motors or supply com- mercial power to the load when the inverter is out of operation.
Notes on wiring
•Be sure to interlock the magnetic contactor on the secondary side with the power supply to prevent commercial power from being applied to the inverter output terminals.
•When installing a magnetic contactor (MC) between the inverter and the motor, avoid turning the magnetic contactor on or off during operation. Turning the magnetic contactor on or off during operation causes a cur- rent to rush into the inverter which could lead to malfunction.