UDRF01.04GB
Maintenance manual DRF 400–450
10
11 Common electrics – 11.5 Distribution of electricity
11.5
Distribution of electricity
page
–
Distribution of electricity, description
This section describes the distribution of electric power and commu-
nication between the control units. The distribution of electric pow-
er describes the basics of the electrical system and the network of
control units.
11.5.1
Voltage feed
page
–
Start-up of electrical system, description
When the machine isn’t in use, the electrical system is in a power-
less mode, that is, neither power electronics nor controls units are
supplied with voltage. When the machine is started, voltage feed is
activated and the redundant CAN bus is initiated. Start-up is handled
by control unit cab (D790-1).
The first pre-requisite for the machine to be able to perform any ac-
tion is to first establish the redundant voltage feed for control units
and then establish CAN-bus communication to administer control
signals for functions.
Control units establish communication when:
•
Operator’s door is opened
•
Interior lighting is lit
•
Flashing hazard lights are activated
•
Start key in position I
Start-up
The following takes place at start-up:
1.
Start-up signal to Control unit cab (D790-1).
Start-up signal is sent
2.
Control unit cab (D790-1) initiates connection of redundant volt-
age feed. See
Redundant voltage feed of control units, descrip-
D797-F
D797-R
D791
D791-2
(D791-3 / D791-4)
D790-1
D790-2
D797-O
D795
Startup signal
000036
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