Hardware description
37
Swing-out frame layout
The swing-out frame inside the supply module cubicle provides space for the control
unit (RDCU), branching unit (APBU), I/O signal and auxiliary circuit terminal blocks,
breakers and relays.
The frame can be opened by removing the mounting screws and moving the swing-
out frame aside. Depending on selected options, the actual equipment may differ
from what is depicted below.
No. Description
1 Auxiliary voltage distribution terminal block
2 24 V DC power supply
3 24 V DC back-up accumulator (auxiliary power
interface board [RAPI])
4 Supply module control unit (RDCU) including
the control board (RMIO)
5 Circuit breakers for auxiliary circuits
6 Ground fault monitoring relay (option +Q954)
7 Internal control relays
8 APBU Branching Unit
with parallel supply
modules
3
4
5 6
8
1
2
7
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