Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
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Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
O) Though the additional jib is not fitted to crane:
the warning light 1 flashes quickly,
the warning lights 2, 3, 4, and 7 are lighted permanently
and an intermittent quick acoustic alarm is emitted Bip -Bip - Bip - Bip
CAUSE
The DMU still receives a pressure value relating to jib cylinder
! FAILURE ANALYSIS
If the computer is connected to crane a jib pressure value of 514 bar is displayed.
The electronic card tted to the connector tted to the end of the basic crane extensions is damaged.
CHECK
Two checks are possible to verify the electronic card damage:
a) t a new electronic card
b) disconnect the electronic card and t the jib.
If the crane operates correctly (crane with jib), the electronic
card is damaged.
SOLUTION
Replace the electronic card.
4
7
1
3
2
P) The jib load limiting device comes into operation though a jib load lower than
the load allowed by the load diagram is applied.
The DMU comes into operation and stops jib extensions from exiting though the
load is lower by 30-40% than data on sheet.
CAUSE
The DMU receives an anomalous pressure value relating to jib cylinder which is higher than the value
resulting from the load applied.
! FAILURE ANALYSIS
When the computer is connected, it only indicates that 100% of the load is applied to jib:
The DMU advances its operation because it receives an increased pressure signal.
CHECK
Two checks are possible to verify the electronic card damage:
c) t a new electronic card
d) disconnect the electronic card and t the jib.
If the crane operates correctly (crane with jib), the electronic card is damaged.
SOLUTION
Replace the electronic card.
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