9 Fault nding
Table 14 Fault nding
Condition
Pump does not start on page 52
Pump does not reach the ultimate pressure on page 52
Pumping speed is too low on page 53
After switching off the pump under vacuum, pressure in the system rises
too fast on page 53
Pump gets too hot on page 53
Oil in the intake line or the vacuum vessel on page 54
Oil is turbid on page 54
Pump is excessively noisy on page 54
External oil leakage on page 55
Fault Pump does not start
Cause Wiring malfunction.
Remedy Check and repair wiring.
Cause Motor protection switch incorrectly set (three-phase motors only).
Remedy Set motor protection switch properly.
Cause Motor is malfunctioning.
Remedy Replace the motor.
Cause The operating voltage does not match that of the motor.
Remedy Check whether the correct product number was booked. Adjust the voltage or replace
the motor
.
Cause Oil temperature is below 10 °C (50 °F)
Remedy Check the temperature with the team. Heat the pump and pump oil or use a differ
ent oil.
Cause Oil is too viscous.
Remedy
Change the oil. Refer to Chang
e the oil
on page 44.
Cause Pump is seized.
Remedy Repair the pump. Contact Service.
Fault Pump does not reach the ultimate pressure
Cause Measuring technique or gauge is unsuitable.
Remedy Use correct measuring technique and gauge. Measure the pressure directly at the intake
port of the pump.
Cause External leak
Remedy Repair the pump. Contact Service.
300956027_002_A0 - 03/2022 - © Leybold
52
Fault nding
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