Electrical systems – 5000 Functional description Order number 249896-040
Date 2007-05-11
Valid from serial number 985777-
T-code 789, 790, 791, 817, 818
11.4 Functional description means constantly on
means flashing.
This section gives basic electrical descriptions 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. • Prior events - Indicates the event number which must have taken place immediately before in order for current event 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 operation. Note that “resulting conditions” show what is expected when no error conditions are present. Items shown in square brackets [ ] refer to electrical component designations as stated in the electrical wiring diagrams. Unless otherwise stated, high ≈ 24 V and low ≈ 0 V
11.4.1 Principle of operation Table 10: Principle of operation Event:
1. Battery connected
Action(s)
Connect the traction battery [X1, G1]
Influencing elements
Main power fuses ok [F1, F3] Operating circuit fuses ok [F50, F51, F52, F53] PTC resistor ok [R1]
Resulting conditions
24V (control) supplied directly to [A2], [A5] and via R1 to [A1], [A3], [A5] Curtis status LED blinks once every 5 seconds.[A1]
© TIEE SARL
Service Manual
7SLL12.5, 16, 20, 13.5S, 12.5F, 16F, 20F
11- 27
