Frames R6I And R7I; Dc Connection And Capacitor Charging - ABB ACS880-104 Hardware Manual

Frames R6i and R7i


The DC input terminals are located at the top of the module; the AC output are located at
the bottom. The ZCU-14 control unit is mounted onto the module; the control unit contains
the basic I/Os and slots for optional I/O modules. For descriptions of the I/O terminals on
the ZCU control unit, see chapter
primarily installed on separate mounting plates.

DC connection and capacitor charging

The module must be equipped with external DC fuses. A DC switch/disconnector can be
installed if quick isolation of the module from the DC bus is required.
A capacitor charging circuit must be fitted if
•
the inverter module is connected to the DC bus through a DC switch/disconnector, or
•
the inverter unit is directly connected to the DC bus and the supply unit of the system
does not have a charging capability.
Frame R6i modules ordered with option +F272 have an internal capacitor charging circuit.
Frame R7i modules require, in addition to option +F272, a charging contactor and
charging resistors which must be fitted outside the module. The contactor is controlled by
an internal monitoring board using a voltage of 230 V DC.
The inverter control unit
Hardware description 31
(page 293). Other equipment is