ABB ACS880-07, Hardware Manual

Page: 44 / 274

￭ 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. Units with a switch-disconnector also
have a main contactor.
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.
￭ Auxiliary voltage switch (Q21)
The auxiliary voltage switch controls the supply to the auxiliary voltage transformers. The
transformer feeds the control circuits inside the drive such as cooling fans, relays and
measuring equipment. The switch is fitted with fuses.
￭ Grounding (earthing) switch (Q9.x), optional
The grounding switch (Q9.1, F259) connects the main AC power bus to the PE
busbar. Units with 12-pulse connection (A004) have two switches (Q9.1 and Q9.2),
one for each 6-pulse supply line.
To close the grounding switch, auxiliary voltage must be switched on, and the main
disconnecting device must be open.
WARNING!
The grounding switch does not ground the input power terminals of the drive or
the auxiliary (control) voltage circuits.
￭ Other devices on the door
• Voltmeter (G334); comes with a phase selector switch.
Note:
The voltage is measured on the supply side of the main switch or breaker.
• AC current meter (G335) on one phase.
￭ Control panel
The ACS-AP-W is the user interface of the drive. It provides the essential controls such as
Start/Stop/Direction/Reset/Reference, and the parameter settings for the inverter control
program.
44 Operation principle and hardware description