Troubleshooting
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300407956_002_C1 - 01/2017 - © Leybold
6 Troubleshooting
6.1 Pump Malfunctions
6.1.1 Malfunctions with CC-type Pumps
Malfunction
Remedy
Thermal relay trip
Reset trip (cf. Fig. 3.6)
Motor thermal switch trip
Let the pump cool down (≤ 59 °C), then press the “ON”
button (CC cover) manually.
Casing thermal switch trip Let the pump cool down (≤ 70 °C ~ 40 °C), then press
the “ON” button (CC cover) manually.
6.2 Malfunctions with Frequency Converter Operations (option)
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.
Malfunction
Likely cause
Remedy
Current is too high
Exhaust pressure rises.
Pump with noise, and rotors are in contact.
Power supply failure.
Check exhaust piping and silencer.
Replace or overhaul pump.
Check power supply.
Motor temp. high (90 °C)
Insufficient cooling.
Motor failure.
Check water flow and temperature.
Replace the motor.
Casing temp. high (85 °C)
Insufficient cooling.
Insufficient coolant in the water jacket.
Byproduct is clogged.
Check water flow and temperature.
Refill the coolant.
Replace or overhaul pump.
Water flow is too low
Water piping leaks.
Differential pressure is too small
Water piping is clogged.
Outlet / inlet is reverse.
Check the fittings.
Check the inlet and outlet pressure of water piping.
Clean or replace piping.
Connect correctly.
