Xylem SVI Vertical Multistage Centrifugal - Manual (Page 20)

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9. 9. 9. 9. Troubleshooting Troubleshooting Troubleshooting Troubleshooting
FAULT FAULT FAULT FAULT PROBABLE CAUSE PROBABLE CAUSE PROBABLE CAUSE PROBABLE CAUSE POSSIBLE REMEDIES POSSIBLE REMEDIES POSSIBLE REMEDIES POSSIBLE REMEDIES
No power Restore the power supply.
Protective fuses of the pump or
of the auxiliary circuits burnt
out. Change the fuses
1. The pump does not start
Overload protection has tripped. Reset the protection (if it trips,
see fault 4)
Liquid level too low Fill the tank with liquid
(min. level see fig.1)
Blocked intake filter. Dismantle and clean the pump
2. The pump starts but does not
deliver, or the flow rate
delivered is low and
inconstant.
Contrary rotation Check the direction of rotation
and, if necessary, exchange two
phases in the motor or in the
electric control panel.
Presence of foreign bodies
inside the pump, between the
impellers and the diffusers. Dismantle and clean the pump 3. Noisy pump operation
Motor bearings are worn. Replace the bearings or the
motor.
Presence of foreign bodies
inside the pump, between the
impellers and the diffusers. Dismantle and clean the pump
The pump is sucking up a
dense, viscous liquid. Check the actual power
necessary according to the
characteristics of the pumped
liquid and change the motor.
4. Overload protection activates
The pump is distributing a flow
rate higher than the limit
indicated on the data plate. Partly close the interception
valve on delivery until the flow
rate returns within the limits
contemplated.