Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
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Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
4
7
1
3
2
D) When starting the DMU, the warning lights 1, 2, 3, 4,
and 7 are flashing slowly 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 tted behind a control bank lever is operated in one direction.
! FAILURE ANALYSIS
If the computer is connected to crane (tools control bank lever diagnostics conditions and
errors) the error state is displayed:
- The indication “1” next to the words “lever not in neutral position when DMU is started” appears.
The indication “1”appears on the same page next to the direction of the lever whose microswitch is
operated when the DMU is started.
CHECK
Check the error state disappears on computer when carrying out the electric by-pass on microswitch
connecting cable, as outlined in Chapter 17. If the error state does not disappear, this means that the
electrical connecting cable is interrupted between the DMU and the microswitch related the direction
operated.
SOLUTION
Restore electric connection.
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