Effer DMU 2000 - Page 43

Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
THE POWER OF PERFORMANCE
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4
7
1
3
2
C) When starting the DMU, the warning lights 1, 2, 3, 4, and 7
are flashing quickly and a
continuous acoustic alarm is emitted Biiiiiiiip
CAUSE
The DMU receives the indication that a crane control bank lever is not in its central position: a micro-
switch applied behind a control bank lever is operated in both directions.
! FAILURE ANALYSIS
If the computer is connected to crane (tools control bank lever diagnostics conditions and
errors) three errors are displayed:
- “1” appears next to: “lever sensor disconnected (contrasting manoevres)”
- “1” appears next to: “lever not in neutral position when DMU is started”
- “1” appears next to: “any one lever operated”
The indication “1” on BOTH directions of a lever, (a lever of control bank is operated in BOTH direc-
tions)
CHECK
Check the error state disappears on computer when carrying out the electric by-pass on microswitch
connecting cable, as outlined in Chapter 17.
SOLUTION
Replace the faulty microswitch tted to control bank.