UDRF01.04GB
Maintenance manual DRF 400–450
12
11 Common electrics – 11.5.1.2 Redundant voltage feed of control units
11.5.1.2
Redundant voltage feed of control
units
page
–
Redundant voltage feed of control units, description
A. Start-up signal is sent
B. All control units are supplied with voltage
The redundant voltage feed only supplies the control units' control
logic and buses, and is completely controlled by Control unit cab
(D790-1). The control units' outputs remain without electric power
and are first supplied with voltage when the ignition voltage is acti-
vated.
The redundant voltage feed for each control unit is independent of
the other control units. If a control unit is non-functional, it does not
interfere with the voltage feed to the other control units.
When all control units have redundant voltage feed and bus commu-
nication, the system is ready to receive, process signals.
When redundant voltage feed is activated the following takes place.
1.
Start-up signal is sent to Control unit cab (D790-1), see A in illus-
tration.
2.
A hold circuit is activated in Control unit cab (D790-1) which ac-
tivates the control unit's control logic.
3.
Control unit cab (D790-1) activates redundant voltage feed to
the other control units, see B in illustration.
Control unit cab (D790-1) has 4 outputs for voltage feed, other
control units have two inputs for redundant voltage feed. In case
of malfunction of one feed, the control unit is supplied from the
other feed.
D797-F
D797-R
D791
D791-2
D790-1
D790-2
D797-O
D795
D797-F
D797-R
D791
D791-2
D790-1
D790-2
D797-O
D795
A
B
Startup signal
00003
1
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