37
7 TROUBLESHOOTING
Consulting tab.12 and tab.13 can often help to solve troubles or incorrect operation. If the problem persists, please consult us.
The motor does not start and there is no noise 1
The motor does not start but humming noise is heard 2-3-4-5-23
Automatic cut off just after starting 3-6-7-8-9-23
Absorbed power is too high 9-10-11-12-21-22-23
The pump does not produce vacuum 11-13-14-21
The pump produces insufficient vacuum 14-15-16-17-18-19-21-25
The pump makes a strange or loud noise 5-6-9-10-12-20-23
Leakage of liquid from the pump 18-19
The vibrations are too high 5-8-9-10-11-12-20-23-24
Tab 12
1 At least 2 of the electric connections have been cut
off
Check fuses, terminal boards and connection cables and, if
required, replace them
2 At least 1 of the electric connections has been cut off
Vedi punto 1 - See point 1
3 The pump is locked
- Clean internal chamber of the pump
- Check clearance of the impeller and, if required, adjust it
4 Faulty impeller Replace the impeller
5 Faulty bearing Replace bearing
6 Faulty motor Check the motor
7 Motor overload Reduce the service liquid flow rate
8 Too high discharge counter pressure - Reduce counter pressure
- Check if anything is clogging the discharge piping
9 Too high quantity of liquid entrained with the gas Reduce the quantity of entrained liquid
10 Scale or other kind of deposits Decalcify and/or clean the pump
11 Wrong direction of rotation Change direction of rotation
12 Service liquid flow rate too high Reduce service liquid flow rate
13 Service liquid is missing Check the in-feed circuit for service liquid
14 Air leakage in the system Check pipes seals
15 The pump is too small Use a larger size pump
16 Insufficient service liquid flow rate Increase service liquid flow rate
17 Service liquid temperature too high Cool the service liquid
18 Faulty mechanical seal Replace the seal
19 Internal erosion/corrosion Replace damaged components using proper materials
20 Cavitation - Install VGB valve
- Cool the service liquid
- Increase absolute suction pressure
21 Faulty instruments of measure Check the instrumentation
22 Stuffing box gland is too tight (only for 30-40 size) Release pressure exercised by stuffing box gland
23 Ice formation into the pump Heat the system before starting it
24 Coupling pump-motor Check joints, sheaves, V-belts and their alignment
25 Heat exchanger inefficient Check exchanger tubes fouling, flow rate and coolant
temperature
Tab 13
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