Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
THE POWER OF PERFORMANCE
1
S) CRANES MANUFACTURED SINCE APRIL
2006
: if a slewing manoeuvre is carried
out and downgraded work area is entered – this area is controlled by three proximity
switches – a quick intermittent sound is emitted
(an acoustic sound every second)
Bip-Bip-Bip-Bip-…
Or you have an intermittent sound with descending tone of three beeps, repeated
every minute.
Bip-Bip-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 leds 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 lighted LEDs must
be switched on. A quick intermittent sound indicates a failure on two proximity switches, a descending
sound indicates a failure on only one of the two proximity switches.
N.B.: This type of alarm is operated as a result of a slewing manoeuvre, while entering the down-
graded work area.
N.B.: after the DMU is electrically disabled, when it is restarted no sound is emitted for the pre-
sence of any 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 can also be heard after repairing the failure, this is an indication that the two outer
proximity switches have been applied in an inverted position.
Summary of Contents for DMU 2000
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