Distribution Of Electricity; Voltage Feed - Kalmar DRF420-60S5 Maintenance Manual

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Startup signal

Start-up signal is sent

11 Common electrics – 11.5 Distribution of electricity

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.

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:

The following takes place at start-up:

(D791-3 / D791-4)

Maintenance manual DRF 400–450

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Distribution of electricity

Operator's door is opened

Interior lighting is lit

Flashing hazard lights are activated

Start key in position I

Start-up signal to Control unit cab (D790-1).

Control unit cab (D790-1) initiates connection of redundant volt-

age feed. See Redundant voltage feed of control units, descrip-

tion page 12.

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