Main Switch-Disconnector / Breaker; Auxiliary Voltage Switch; Grounding Switch; Charging Switch - ABB ACS880-207 Hardware Manual

Main switch-disconnector / breaker

The supply unit is equipped with a main switch-disconnector ([Q1], option +F253) or a
main breaker in high powers ([Q1], option +F255) as standard. With this device, you can
isolate the main circuit of the drive from the power line. The switch has an operating
handle on the cabinet door. The main breaker is withdrawable: to disconnect the drive,
crank the breaker out with a separate loose handle (included in the delivery).
WARNING! The switch/breaker does not isolate the input power terminals, AC
voltage meters ([P5], option +G334) or the auxiliary circuit from the power line. To
isolate auxiliary voltage, use the auxiliary voltage switch [Q21]. To isolate the input
power terminals and AC voltage meters, open the main breaker of the supply transformer.
Especially in case of a circuit breaker the main circuit breaker does not isolate the
charging circuit. To isolate the charging circuit, use the charging switch [Q3].
Note: The earthing/grounding switch ([Q9], option +F259) and the main switch-
disconnector are electrically interlocked: only one of the switches can be closed at a time.
To close the switches, you must also have the auxiliary control voltage on.

Auxiliary voltage switch

The supply unit is equipped with an auxiliary voltage switch [Q21] as standard. Using the
switch, you can disconnect the auxiliary circuit from the power line. The switch has an
operating handle on the cabinet door.

Grounding switch

The supply unit can be equipped with an optional grounding switch ([Q9], option +F259)].
Using the switch, you can temporarily ground the main AC busbars of the supply unit
during the maintenance work. The switch has an operating handle on the cabinet door.
WARNING! The grounding switch [Q9] grounds the main AC busbars between
the main breaker and the LCL filter module. It does not ground the input power
terminals or auxiliary circuits.
Note: The grounding switch and the main switch-disconnector ([Q1], option +F253) are
electrically interlocked: only one of the switches can be closed at a time. To close the
switches, you must also have the auxiliary control voltage on.

Charging switch

The charging switch [Q3] is a standard device.
To charge the drive, the charging switch must be closed. The charging switch does not
control the charging circuit, it just provides power to the charging circuitry. The charging
circuit is controlled by the charging contactor [Q4], which is controlled by the control unit.
The charging switch has an operating handle on the cabinet door.

Operating switch

The operating switch [S21] is a standard device.
By default, the operating switch controls the unit as follows:
•
The ENABLE/RUN position: The control program closes the charging contactor [Q4]
and the main DC link is charged. After the DC link is charged, the main contactor [Q2]
Operation principle and hardware description 31