Troubleshooting
52
300750767_002_C3 - 12/2020 - © Leybold
6 Troubleshooting
6.1 Pump Malfunctions
Malfunction
Likely cause
Remedy
Pump does not start
up.
EF2, EF3
or
100FT
is displayed at the fre-
quency converter (see
Section 6.2)
Motor incorrectly connected.
Overtemperature switch or motor stator
defective.
Pressure switch is defective.
Lubricant is too thick.
Motor rotor defective.
Pump has seized: defective impellers, bearings or
toothed gears.
Connect motor correctly.
Leybold Service.
Replace the pressure switch.
Exchange the lubricant or warm up lubricant and
pump.
Leybold Service.
Leybold Service.
Pump gets too hot.
At the frequency con-
verter (see Section 6.2)
then a Pt 1000 alarm is
indicated
Cooling water supply is not sufficient.
Cooling water lines are clogged.
Ambient temperature is too high or cooling air
flow is obstructed.
Pump is operating in the wrong pressure range.
Gas temperature is too high.
Clearance between housing and rotors are too
small due to
- contamination
- distortion of the pump
Friction resistance is too high due to contaminat-
ed bearings and/or contaminated lubricant.
Lubricant level is too high.
Lubricant level is too low.
Wrong lubricant filled in.
Bearing is defective.
Ensure sufficient cooling water supply.
Decalcify cooling water lines.
Install the pump at a suitable place or ensure a suffi-
cient flow of cooling air.
Check the pressure levels within the system.
Check system.
Clean pumping chamber.
Affix and connect the pump free of tension.
Clean the pump or carry out maintenance.
Drain lubricant down to the correct level.
Top up lubricant to the correct level.
Leybold service
Leybold Service.
Pump is extremely
loud.
Bearing damage.
Thick particle deposits.
Defective silencer.
High gas throughput with the discharge line
open, without silencer.
Repair pump.
Clean pump, respectively perform maintenance.
Repair silencer.
Install discharge line or silencer.
Motor power con-
sumption is too high.
Like „Pump gets too hot“.
Incorrect mains voltage for the motor.
Like malfunction „Pump gets too hot“.
Connect the motor to the correct mains voltage.
Pump is too loud.
Motor stator defective.
Motor rotor defective.
Distances between housing and rotors is too
small due to
- contamination
- distortion of the pump
Bearing or gear damage.
Rotors make contact with the housing.
Rotor is running untrue.
Oil slinger disc makes contact with the gear
housing.
Leybold Service.
Leybold Service.
Clean pumping chamber.
Affix and connect the pump free of tensions.
Leybold Service, shutdown pump immediately.
Leybold Service, shutdown pump immediately.
Leybold Service, shutdown pump immediately.
Leybold Service.
