Controls Of The Supply Unit; Main Disconnecting Device; Auxiliary Voltage Switch; Grounding Switch - ABB ACS800 Hardware Manual

34

Controls of the supply unit

The supply unit control program runs in the RDCU control unit located in the swing-
out frame. The RDCU is connected to the supply modules by a fibre optic link, and a
separate wire set. If there are parallel supply modules, the controls from the RDCU
are distributed to the modules with an optical branching unit (APBU board). The
RDCU is also connected to the inverter unit with a fibre optic link and to the panel
through the panel link.
Typically, the user controls the supply unit with the control devices mounted on the
cabinet door. The use of these control devices is described in the following
subsections. No additional control devices or connections are needed. However, it is
also possible to control the unit with the control panel and through the fieldbus.

Main disconnecting device

The drive is always equipped with a main disconnecting device. The device is either
the main switch-disconnector inside the module (no option +F253 or +F255), the
main switch-disconnector outside the module (option +F253), or the main breaker
outside the module (option +F255).
The user operates the main switch-disconnector(s) with a handle on the cabinet
door. The breaker is withdrawable; its must be racked out when disconnection is
needed.

Auxiliary voltage switch

The auxiliary voltage switch controls the voltage supply for the auxiliary circuits.
Note: If the drive is equipped with an uninterruptible power supply (option +G307)
there is also an additional switch-disconnector inside the cabinet for the UPS circuit.

Grounding switch

A grounding switch for the temporary grounding is an option (+F259). The user
operates the switch from a handle on the cabinet door.

Other operating switches

Depending on the drive options, the switches shown in the drawing below may be
mounted on the door of the cabinet.
Hardware description
WARNING! The main disconnecting device does not switch off the auxiliary
voltages inside the cabinet.