20
5.0
ТЕХНИЧЕСКОЕ И СЕРВИСНОЕ
ОБСЛУЖИВАНИЕ
5.0
MAINTENANCE AND SERVICING
5.3
Troubleshooting
Fault
Cause
Remedy
Fault in the electrical supply
Check the pipes and fuses.
Use slow-blowing fuses.
Motor overload
Remove the cause of the overload.
Press
the motor protection switch again
(electrical switch cabinet accessible
from
the rear).
No pilot pressure, or pilot pressure is less
than
50 bar for DOB 200 (<100 bar for
DOB 300)
Increase the pilot pressure.
Activate supply cylinder with higher
pressure.
Motor does not start/restart
Pump cylinder heads overheated (an
indicator
light in the red button (Stop)
comes on)
Allow the pump to cool (ambient
temperature no greater than 40°
C
).
Intake or pressure valve is sticking or worn
Careful tapping with a hammer on the
relevant valve housing generally frees
the
sticking valve balls.
If not:
Release the pressure from the pump.
Remove, clean or replace t he intake
and
pressure valves.
Make sure all parts are correctly
reinstalled.
No pressure build-up when
pumping
Overflow valve still open
Close the valve.
Leak at piston seals
Wear, thermal damage due to high
temperatures
or inadequate pilot
pressures
Install new piston seals.
Leaks in the piping system.
Vibration, mechanical stresses.
Pressurize the system.
Check for leaks, using a suitable leak
indicator for oxygen.
Depressurize the system and carefully
tighten up the corresponding screw
connections.
If any faults cannot be remedied by the above
actions, or if other faults occur, inform
Dräger
Service.