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10. Troubleshooting
Maintenance and repair operations must be carried out by qualified personnel. Before
servicing the set, disconnect the power supply and make sure there is no pressure in the
hydraulic components.
The frequency converter memorizes the last alarms triggered. Refer to the frequency converter operating
instructions for the types of malfunctions and directions on how to view the last alarms triggered.
Problem
1.
Set is off
2.
Motor does not start
3.
Frequent
startups
and stops
4.
The motor runs but
no
water
delivered
5.
Pump leaks water
6.
Too noisy
20
Cause
1.
Power supply disconnected
2.
Switch in OFF position
1.
Power supply disconnected
2.
Triggering
protector
3.
Defective motor
1.
Defective tank
1.
No water on suction side or inside
is
pump
2.
Air in suction piping or pump
3.
Loss of pressure on suction side
4.
Check valve jammed
5.
Clogged pipe
1.
Defective mechanical seal
2.
Undue
mechanical stress
pump
1.
Water return when pumps stop
2.
Cavitation
3.
Pump rotation hindered
of
motor
thermal
on
Solution
Connect power supply
Set switch to ON
Connect power supply
Eliminate malfunction
Repair/replace motor
Repair/replace tank
Fill the pump or suction piping /
open the on-off valves
Bleed the pump, check the
suction connections.
Check
the
NPSH
necessary, modify the system
Clean the valve
Clean the pipe
Replace the mechanical seal
Support the pipes
Check the check valve
Check suction
Check for undue mechanical
stress on pump
and,
if
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