31
300423246_002_C1 - 10/2018 - © Leybold
Troubleshooting
6 Troubleshooting
Fault
Possible cause
Remedy
Reference
section
*
Pump does not
Pump is connected incorrectly.
Connect the pump correctly.
3.3
start.
Motor protection switch incorrectly set
Set motor protection switch properly or
3.3
or fuse is blown.
change fuse.
Operating voltage does not match motor.
Replace the motor.
Motor is malfunctioning.
Replace the motor.
Oil temperature is below 12 °C (54 °F).
Heat the pump and pump oil or use
1.4
different oil.
Oil is too viscous.
Use appropriate oil grade.
5.4-B
Exhaust filter / exhaust line is clogged.
Replace the filter or clean the exhaust line.
5.4-D
Pump does not
External leak
Repair the pump.
reach ultimate
Float valve does not close.
Repair the valve.
5.4-H
pressure.
Anti-suckback valve is malfunctioning.
Repair the valve.
5.4-F
Inadequate lubrication due to:
■
unsuitable or contaminated oil,
Change the oil (degas it, if necessary).
5.4-C
■
clogged oil filter,
Replace the oil filter.
5.4-C
■
clogged oil lines.
Clean the oil casing.
Vacuum lines are dirty.
Clean vacuum lines.
Pump is too small.
Check the process date; replace the
pump, if necessary.
Pumping speed is
Precaution : install a dust filter in intake line.
too low.
Exhaust filter is clogged.
Install new filter elements.
5.4-D
Connecting lines are too narrow or
Use adequately wide and short
3.2
too long.
connecting lines.
Anti-suckback valve is hard to open.
Check spring free length.
After switching off System has a leak.
Check the system.
pump under
Anti-suckback is malfunctioning.
Repair the valve.
5.4-F
vacuum, pressure
in system rises
too fast.
Pump gets too
Cooling air supply is obstructed.
Set pump up correctly.
3.1
hot
Cooler is dirty.
Clean the cooler.
Ambient temperature is too high.
Set pump up correctly.
3.1
Process gas is too hot.
Change the process.
Oil level is too low.
Add oil to reach the correct oil level.
5.4-C
Oil is unsuitable.
Change the oil.
5.4-C
Oil cycle is obstructed.
Clean or repair the oil lines.
Exhaust filter / exhaust line is obstructed.
Replace the exhaust filter, clean the
5.4-D
exhaust line.
Pump module is no longer usable.
Replace the pump module.
5.4-K
