Effer DMU 2000 - DMU Troubleshooting and Fault Resolution; Troubleshooting Sensor and Communication Faults

Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
THE POWER OF PERFORMANCE
46
Electronic device DMU2000 - DMU3000 - DMU3000 PLUS
4
7
1
3
2
F) The warning light 3 flashes quickly,
the warning lights 1, 2, 4, and 7 are lighted permanently
and a continuous acoustic alarm is emitted Biiiiiiiip
CAUSE
The DMU does not receive any pressure value relating to rst boom cylinder.
! FAILURE ANALYSIS
If the computer is connected to crane (tools sensor diagnostics DMU hardware) the error
state is displayed:
- “1” appears next to: “pressure sensors disconnected”
CHECK
Check the error state disappears and a pressure value of about 135 appears on computer when carrying
out the electric by-pass on transducer connecting cable, as outlined in Chapter 17 (This check is equiva-
lent to connecting a new transducer electrically only, without inserting it into cylinder, and you should
read a pressure value of 0 bar).
SOLUTION 1)
Replace the pressure transducer
! FAILURE ANALYSIS
If the computer is connected to crane (tools sensor diagnostics DMU hardware) the error
state is displayed:
- The indication “1” appears next to: “pressure sensors disconnected”.
CHECK
Check thta the error state disappears and a pressure value of about 135 appears on computer when
carrying out the electric by-pass on transducer connecting cable, as outlined in Chapter 17 (This check
is equivalent to connecting a new transducer electrically only, without inserting it into cylinder, and
you should read a pressure value of 0 bar). If the error state continues, the pressure sensor connecting
cable is damaged.
SOLUTION 2)
Restore electric connection between DMU and pressure transducer.