12- 14 Service Manual LWE130 © BT Europe AB
Electrical system – 5000
Functional description
T-code Valid from serial number Date Order number
675 914369- 2005-09-23 226057-040
12.8 Functional description
12.8.1 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 func-
tions are referred to as “Events”. Each event is numbered.
• Preceding event - Indicates the event number which must have tak-
en 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 re-
lating to a specific event.
Note that “resulting conditions” show what is expected when no error
conditions are present.
Table 6: Theory of operation
Event: 1. Battery connected
Preceding event
-
Action(s)
Insert mains plug for charger [A30] in the start interlock device [S170].
Influencing
elements
Operating circuit fuse ok [F50].
Emergency switch-off not depressed [S21].
Resulting
conditions
Truck is ready for switch-on.
Quick-test: press signal horn button [S18]! Signal horn shall sound.
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