Miscellaneous; Details Of The Locking Solenoid Control; Switch Fuse Operation When The Drive Dc Bus Is Not Live - ABB ACS800 Multidrive Hardware Manual

Asfc switch fuse controller unit for frame r8i inverter modules

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Miscellaneous

The switch fuse locking is released by the locking solenoid when:

• Switch fuse handle in 1 (on) position. (ASFC monitors an auxiliary contact.)

• DC voltage of all inverter modules monitored by the ASFC unit exceed 80% of the

nominal value. (ASFC receives UDC signals from inverters.)

• At least one of the inverter module enabled/disabled switches (S1...S3) is in

enabled position.

When all conditions are met simultaneously, a relay included in the ASFC connects

the operating voltage to the solenoid for 3.5 seconds.

If the handle of the switch fuse is turned to 1 (on) position when the DC busbar of the

inverter system is unpowered, the spring-operated main contacts remain open.

Later, when the drive supply unit is switched ON, the power-on sequence follows the

routine described in section

Inverter power switch-on sequence

on page 10.

Hardware description

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