ABB ACS880-07XT Series, Hardware Manual, Page: 35 / 168

Operation principle and hardware description 35
Main disconnecting device (Q1.1)
Depending on the configuration of the drive, the main disconnecting device of the drive is
either a switch-disconnector or a main circuit breaker.
The main disconnecting device switches the main supply to the drive on and off. To
disconnect the main supply, turn the switch-disconnector to the 0 (OFF) position, or rack
out the main breaker (whichever device is installed).
WARNING! The main disconnecting device does not isolate the input power
terminals, AC voltage meters, or the auxiliary voltage circuit from the power line.
To isolate the auxiliary voltage circuit, open the auxiliary voltage switch (Q21). To
isolate the input power terminals and AC voltage meters, open the main breaker of the
supply transformer.
To close the main disconnecting device, auxiliary voltage must be switched on, and the
grounding switch (if present) must be open.