Troubleshooting
53300750767_002_C3 - 12/2020 - © Leybold
Malfunction Likely cause Remedy
Pump is losing lubri-
cant.
Lubricant leak is apparent:
Oil drain plug is leaky.
Oil level glasses leaky.
Gear cover is leaky.
Puddle under the motor, leak in the seal.
No lubricant leak is apparent:
See malfunction „Lubricant in the pump
chamber“.
Drain lubricant, firmly screw in a new oil drain plug
with the gasket, fill in correct lubricant quantity
Leybold Service.
Replace the O-ring of the gear cover.
Leybold Service, shutdown pump immediately.
See malfunction „Lubricant in the pump chamber“.
Oil gets too dark. Oil has been used up.
Pump gets too hot.
Exchange the oil.
See malfunction „Pump gets too hot“; after remedy
of the malfunction, exchange the oil.
Lubricant in the pump
chamber.
Lubricant level is too high.
Lubricant is ejected from the system.
Pump is not standing horizontally.
Pump has a gas leak towards the outside.
Pump has an internal leak.
Shaft seals are defective.
Drain the lubricant down to the correct level.
Check system.
Place the pump correctly.
Run a leak search and pinpoint leaks. If the leak is
not at the oil-fill or oil-drain plugs, return the pump
to the Leybold Service.
Leybold Service.
Leybold Service.
Pump does not attain
its pumping speed.
Intake screen is clogged.
Motor incorrectly connected.
Motor stator defective.
Motor rotor defective.
Vacuum pump system has a gas leak.
Rotor gap is too great.
Bearing defective.
Clean intake screen.
Connect motor correctly.
Leybold Service.
Leybold Service.
Detect leak and seal it.
Leybold Service.
Leybold Service.
6.2 Fault and Alarms Displayed at the Frequency Converter
Faults and alarms indicate problems in the frequency converter or in the
pump.
An alarm (warning) is indicated by a code on the data display and the
flashing ALM LED. The frequency converter output is not necessarily
switched off.
A fault is indicated by a code on the data display and the ALM LED is on.
The frequency converter output is always switched off immediately and the
motor coast to stop.
To remove an alarm or reset a fault, trace the cause, remove it and reset the
frequency converter by pushing the Reset key on the operator or cycling the
power supply.
This lists up the most important alarms and faults only.
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