Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
THE POWER OF PERFORMANCE
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Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
R) CRANES MANUFACTURED SINCE APRIL
2006
: if a slewing manoeuvre is carried
out and downgraded work area is entered – this area is controlled by two proximity
switches – a quick intermittent sound is emitted
(one acoustic sound every second)
Bip-Bip-Bip-Bip-……
No lightening indication appears on the DMU panel.
CAUSE
There is a short circuit in the electrical wiring controlling the downgraded work area: with this fault,
the rear work area on truck – area of maximum performance – has a higher operating angle: the truck
risks overturning.
!
FAILURE ANALYSIS
This fault is not displayed on the computer: this type of failure can be confirmed if you carry out a visual
check of the state of the led lights on the proximity switches relating to the management of the slewing
angles.
CHECK
A lighted led is placed on each proximity switch: if you keep the crane boom positioned within the work
angle of the crane maximum capacity (proximity switches not covered by cam), the LED lights must be
on.
N.B.: This type of alarm is operated as a result of a slewing manoeuvre, while entering the
downgraded work area.
N.B.: After the DMU is electrically disabled, when it is restarted no sound is emitted for the
presence of the fault, although the fault is still there.
SOLUTION
Each proximity switch is connected with three electric wires: there are two polarities and the third wire
is the return of the signal to DMU. Check that the cables are intact and if no faults are found, replace the
proximity switches.
N.B.: If this alarm continues after repairing the failure, this is an indication that the two proximity
switches have been applied in an inverted position.
Summary of Contents for DMU 2000
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