ABB ACA 6 Series Hardware Manual page 24

Chapter 1 – Introduction
Switch Fuse with
Charging Circuitry
(Optional)
Type 1
L+ L–
1L+ 1L–
1-12
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.
Type 2
L+ L–
1L+ 1L–
Type 3
L+ L–
1L+ 1L–
* NCHM-11 is used with
115 V AC and NCHM-21 with
230 V AC auxiliary voltage
ACS 600 MultiDrive Hardware Manual
NCHM-xx*
Charging
Monitoring
Unit