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