Damcos LPU: Troubleshooting Guide LPU Service Manual
February 2017 SM 8000-100-01 Ed 04
45
Fault Finding List LPU
ACTUATOR CONNECTED PROBLEM
“Actuator only running in one direction (the unit can either only open or only close)” on page 53
“LPU-D not maintaining pressure on actuator” on page 57
“Spring actuator only partly closing or not starting to close” on page 58
“Too little tank volume for operating actuator” on page 66
“Spring actuator do not close by emergency hand pump operation” on page 69
ELECTRICAL PROBLEM
“Unit drawing too much current” on page 65
EMERGENCY OPERATION
“Emergency operation by key giving oil spillage through breather valve” on page 59
“Emergency operation by key not possible, hydraulically locked” on page 59
“Emergency operation by hand pump giving oil spillage through breather valve” on page 59
“Emergency operation by hand pump not possible” on page 60
“Spring actuator do not close by emergency hand pump operation” on page 69
LPU-D
“LPU-D not maintaining pressure on actuator” on page 57
LPU-Ex
“LPU-Ex motor do not run” on page 70
“LPU-Ex has to be bulkhead mounted because of too little space or zone 0 at actuator” on page 71
LPU-S
“LPU-S frequently restarting in open position” on page 47
MOTOR
“LPU-Ex motor do not run” on page 70
“Motor not running and is hot” on page 49
“Motor not running and is Cold” on page 49
“Motor not stopping” on page 50
“Motor running hot, LPU is operating normally” on page 56
“Motor running for a short time and stops High pressure on the port to which oil is led” on page 62
“Motor running for a short time and stops” on page 62
“Motor ”diving” in RPM in end position ” on page 63
“Motor ”diving” in RPM as spring actuator opens” on page 63
OIL LEAKAGE
“LPU leaking from bleeder valve when hand pump is mounted” on page 68
“Oil spillage, generally” on page 64
“Oil in electronic connection box” on page 64
“Oil spillage from breather valve” on page 64
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