ABB ACA 6 Series, Hardware Manual

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Chapter 1 – Introduction
1-12 ACS 600 MultiDrive Hardware Manual
Switch Fuse with
Charging Circuitry
(Optional)
The capacitors of the intermediate d.c. link (common DC bus) are
charged via resistors to limit the charging current. In Type 1 the
charging circuitry is implemented internally in the inverter unit (frames
R2i to R4i). In Type 2 the charging is monitored internally (frames R5i
and R6i). In Type 3 the charging circuitry and monitoring are
implemented with external components (frames R7i to R12i). In drive
sections with parallel connected inverter units, each unit has its own
switch fuse with a charging circuit.
L+ L–
1L+ 1L–
L+ L–
1L+ 1L–
L+ L–
1L+ 1L–
Type 1 Type 2 Type 3
NCHM-xx*
Charging
Monitoring
Unit
* NCHM-11 is used with
115 V AC and NCHM-21 with
230 V AC auxiliary voltage