GA01300_0902 - 04/2006 - © by Leybold Vacuum
40
Troubleshooting
6
Troubleshooting
Fault
Possible cause
Remedy
Repair
Pump does not
Wiring is malfunctioning.
Check and repair wiring.
-
start.
Motor protection switch incorrectly set.
Set motor protection switch properly.
3.4
Operating voltage does not match motor.
Replace the motor.
5.7
Motor is malfunctioning.
Replace the motor.
5.7
Oil temperature is below 12 °C.
Heat the pump and pump oil or use a different oil.
4.2.3/5.4
Oil is too thick.
Change the oil.
5.4
Exhaust filter/exhaust line is clogged.
Replace the filter or clean the exhaust line.
-
Pump is seized up (sign: pump is jammed).
Repair the pump.
Service
Pump does not
Measuring technique or gauge is unsuitable.
Use correct measuring technique and gauge.
-
reach ultimate
Measure the pressure directly at the pump’s intake port.
pressure.
External leak
1)
.
Repair the pump.
Service
Anti-suckback valve is malfunctioning.
Repair the valve.
Service
Exhaust valve is malfunctioning.
Repair the valve.
Service
Oil is unsuitable.
Change the oil (degas it, if necessary).
5.4
Vacuum lines are dirty.
Clean the vacuum lines.
-
Pump is too small.
Check the process data, replace the pump, if necessary. -
Pumping speed is
Inlet screen in the intake port is clogged.
Clean the inlet screen.
5.5
too low.
Precaution: install a dust filter in the intake line.
Exhaust filter is clogged.
Install new filter element.
-
Connecting lines are too narrow or too long.
Use adequately wide and short connecting lines.
3.3
After switching off
System has a leak.
Check the system.
-
the pump under
Anti-suckback valve is malfunctioning.
Repair the valve.
Service
vacuum, pressure
in the system
rises too fast.
Pump gets hotter
Cooling air supply is obstructed.
Set pump up correctly.
3.1
than usually
Ambient temperature is too high.
Set pump up correctly.
3.1/4.2.3
observed.
Process gas is too hot.
Change the process.
-
Oil level is too low.
Add oil.
5.3
Oil is unsuitable.
Change the oil.
5.4
Oil cycle is obstructed.
Clean or repair the oil lines and channels.
Service
Exhaust filter/exhaust line is obstructed.
Replace the exhaust filter, clean the exhaust line.
-
Exhaust valve is malfunctioning.
Repair the valve.
Service
Pump module is worn out.
Replace the pump module.
5.9
Oil in the intake line Oil comes from the vacuum system.
Check the vacuum system.
-
or in the vacuum
Anti-suckback valve is blocked.
Clean or repair the anti-suckback valve.
Service
vessel.
Sealing surfaces of the anti-suckback valve are
Clean or repair intake and anti-suckback valve
Service
damaged or dirty.
Oil level is too high.
Drain out excess oil.
5.3
Oil is turbid.
Condensation.
Degas the oil or change the oil and clean the pump.
4.2.2/5.4
Precaution: open the gas ballast valve or fit separator.
Pump is
Oil level is much too low
Add oil.
5.3/5.4
excessively
(oil level is no longer visible).
noisy.
Silencing nozzle is clogged.
Clean the silencing nozzle or replace it.
Fig. 10
Intake pressure is too high.
Lower the intake pressure.
-
Internal demister is clogged.
Clean or replace demister.
5.6
Coupling element is worn.
Install new coupling element.
5.7
Vanes or bearings are damaged.
Repair pump.
Service
* Repair information: Refer to the stated section in these Operating Instructions.
1
) Bubble test: The warm pump with degassed oil is running without gas ballast
and the intake is blanked off. The exhaust line is led into a vessel with water.
If an evenly spaced line of bubbles appears then the pump has an external leak.
