Electrical system – 5000

10.8 Functional description

10.8.1 Theory of operation

This section describes basic theory of operation of the truck’s main functions in tabular form. It describes, in simple terms, what happens when performing any of the truck’s main operations.

•Event - The main stages in performing any of the truck’s main functions are referred to as “Events”. Each event is numbered.

•Preceding event - Indicates the event number which must have taken place immediately before in order for the current event to function correctly.

•Action(s) - A required action from the operator for the event to occur.

•Influencing elements - conditions which must be fulfilled in order for the event to occur. Certain parameter settings may also affect the outcome of the event.

•Resulting conditions - Describes key occurrences which can be checked to confirm that a function operates correctly.

•Logic - Shows the logic relationship between inputs and outputs relating to a specific event

Note that “resulting conditions” show what is expected when no error conditions are present.

Table 10: Theory of operation

Event:

1. Battery connected

Preceding event -

Action(s)

Influencing elements

Resulting conditions

Insert mains plug for charger [A30] in the start interlock device [S170].

Operating circuit fuse ok [F50].

Emergency switch-off not depressed [S21].

Truck is ready for switch-on.

Quick-test: press signal horn button [S18]! Signal horn shall sound.