Dc And Motor Connections; Charging Circuit - ABB ACS800 Hardware Manual

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DC and motor connections

DC input
Motor output

Charging circuit

Installing a switch fuse between the inverter module(s) and the DC link necessitates
a charging circuit. In frame R6i units, the charging circuit consists of charging
resistors and a contactor; with R7i, the charging is monitored by a charging controller
unit (type NCHM-x1C). The main components of the charging circuit (apart from the
fuses and fuse bases) are included in the switch fuse kits.
For frame R6i, the minimum wire sizes to be used in the charging circuit are as
follows:
• From contactor to resistors; between resistors (690 V units): 2.5 mm
• Charging control (wiring to/from NPOW): 0.75 mm
For frame R7i, the minimum wire sizes to be used in the charging circuit are as
follows:
• DC bus to fuses: 2.5 mm
• NCHM to ground: 2.5 mm
• From fuses/NCHM to charging resistors: 1.5 mm
• Switch fuse auxiliary contact/solenoid wiring; auxiliary voltage supply to NCHM:
0.75 mm
L+ (UDC+) L– (UDC–)
U2 V2 W2
2
2
2
(AWG 18).
(AWG 14), double-insulated
(AWG 14)
2
2
(AWG 18).
2
(AWG 14)
(AWG 14)