LEYBOLD 1092791FP, Original Operating Instructions

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300419814_002_C2 - 08/2017 - © Leybold
Troubleshooting
6 Troubleshooting
Fault Possible cause Remedy Reference
Section *
Pump does not
start. Pump is connected incorrectly.
Motor protection switch incorrectly set.
Operating voltage does not match motor.
Motor is malfunctioning.
Oil temperature is below 12 °C (54 °F).
Oil is too viscous.
Exhaust filter / exhaust line is clogged.
Pump is seized up.
(Sign : pump is jammed). Connect the pump correctly.
Set motor protection switch properly.
Replace the motor.
Replace the motor.
Heat the pump and pump oil or use different
oil.
Use appropriate oil grade.
Replace the filter or clean the exhaust line.
Repair the pump. 3.3
3.3
1.8
5.4-B
5.4-D
5.4-J/5.4-K
Pump does not
reach ultimate
pressure. Measuring technique or gauge is unsuitable.
External leak 1).
Float valve does not close.
Anti-suck back valve is malfunctioning.
Exhaust valve is malfunctioning.
Inadequate lubrication due to:
■ unsuitable or contaminated oil,
■ clogged oil filter,
■ clogged oil lines.
Vacuum lines are dirty.
Pump is too small. Use correct measuring technique and gauge.
Repair the pump
Repair the valve.
Repair the valve.
Repair the valve.
Change the oil (degas it, if necessary).
Replace the oil filter.
Clean the oil casing.
Clean vacuum lines.
Check the process date; replace the pump, if
necessary. 4.3
5.4-H
5.4-G
5.4-I
5.4-C
5.4-C
Pumping speed
is too low. Dirt trap in the intake port is clogged.
Exhaust filter is clogged.
Connecting lines are too narrow or too long.
Anti-suck back valve is hard to open. Clean the dirt trap;
Precaution: install a dust filter in intake line.
Install new filter elements.
Use adequately wide and short connecting
lines.
Check spring free length. 5.4-F/1.4
5.4-D
3.1
After switching
off pump under
vacuum, pres-
sure in system
rises too fast. System has a leak.
Anti-suck back is malfunctioning. Check the system.
Repair the valve. 5.4-G
Pump gets too
hot. Cooling air supply is obstructed.
Cooler is dirty.
Ambient temperature is too high.
Process gas is too hot.
Oil level is too low.
Oil is unsuitable.
Oil cycle is obstructed.
Exhaust filter / exhaust line is obstructed.
Exhaust valve is malfunctioning.
Pump module is no longer usable. Set pump up correctly.
Clean the cooler.
Set pump up correctly.
Change the process.
Add oil to reach the correct oil level.
Change the oil.
Clean or repair the oil lines.
Replace the exhaust filter, clean the exhaust
line.
Exhaust valve is malfunctioning.
Replace the pump module 3.1
3.1
5.4-A
5.4-C
5.4-D
5.4-I
5.4-J.