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SD, SDX, SDS_Rev16 - Operating Instructions
Page 13 / 72
12. TROUBLESHOOTING
OFF
WARNING: Turn off the power supply before performing any operations.
Do not allow the pump or motor to run when dry even for a short period
Strictly follow the user instructions and if necessary contact an authorised service centre
PROBLEM
PROBABLE CAUSES
POSSIBLE REMEDIES
1)
The motor
does not start
1a) Unsuitable power supply
1b) Incorrect electrical connections
1c) Engine overload protective device
cuts in.
1d) Blown or defective fuses
1e) Shaft blocked
1f) If the above causes have already
been checked, the motor may be
malfunctioning
1a) Check that the mains frequency and voltage correspond to the
electrical characteristics shown on the indicator plate. Make sure
that the cross section of the cable is compatible with the length
of cable and with the motor power.
1b) Check that the power cable is correctly connected with the control panel.
1c) Check that the thermal overload protection is set correctly (see
data on the motor name-plate) and make sure that the fuseboard
upline of the motor has been properly connected. Check that
the isolation of the motor with the cable is inside the values indicated in the
instruction manual. See also 1a)
1d) Replace the fuses, check the electric power supply and points
a) and c)
1e) Extract the pump, remove and clean the suction filter check that motor and
pump turn freely. If the rotation of the pump and/or the motor is prevented,
contact an authorised service centre.
1f) Repair or replace the motor by contacting an authorised service
centre
2)
The pump
functions
but no water
comes out
2a) Check that the valves are open and
not blocked
2b)
Delivery casing obstructed or
check-valve blocked
2c) Suction valve closed
2d) Pump suction filter obstructed
2e) Pump installed above the surface of
the liquid (dry functioning)
2f) Direction of rotation incorrect
2a) Dismantle the check valve on the delivery pipe and release the
valve, if necessary replace it.
2b) Extract the pump and, if necessary, contact an authorised service centre to
replace the check valve.
2c) Open the suction valve
2d) Extract the pump, remove and clean the suction filter and if
necessary replace it.
2e) Increase the depth of installation of the pump as far as compatible
with pump performance. Do the same if the problem is due to a
lowering of the water table
2f) Invert the electrical connections from the motor to the power
supply terminal
3)
I n s u ff i c i e n t
flow
3a)
Pipes and accessories with
diameter too small causing
excessive loss of head
3b)
Presence of deposits or solid
bodies in the internal passages of
the rotor and/or in the diffusers
3c) Delivery valve or check valve on
the delivery pipe obstructed by solid
bodies.
3d) Pump check valves obstructed by
solid bodies
3e) Rotors deteriorated
3f) Worn rotors and diffusers
3g) Excessive lowering of the dynamic
level of the well
3h) Incorrect direction of rotation
3i) Leaking from delivery pipe
3l) Presence of dissolved gases in the
water
3a) Use pipes and accessories suitable for the specific application
3b) Extract the pump and contact an authorised service centre.
3c) Dismantle the valve and the check valve and clean them.
3d) Extract the pump and clean the check valve, if necessary, contact an
authorised service centre. Clean the suction filter.
3e) To replace the rotors contact an authorised service centre
3f) Contact an authorised service centre to replace the rotors and
the sealing rings of the diffusers, or diffusers themselves if worn
3g) Increase the depth of immersion of the pump as far as
compatible with pump characteristics, reduce the flow requested
by narrowing the suction valve. Pump too big for the dynamic
level of the well
3h) See 2e)
3i) Locate the points in which the delivery pipe is leaking, if located
in the vertical section of the well, extract the pump and repair the
pipe as needed.
3l) Contact an authorised service centre.
4)
Noise and
vibrations
from the pump
5a) Rotating part unbalanced
5b) Impellers that slides on the diffusers
5c) Pump and pipes not firmly attached
5d) Flow too strong for the diameter of
the delivery pipe
5e) Unbalanced power supply
5a) Check that no solid bodies are obstructing the rotor. Contact an
authorised service centre to check the pump shaft sleeves conditions.
5b) If the thrust bearing of the motor and/or the pump shaft sleeves
are worn, contact an authorised service centre.
5c) Anchor the delivery and suction piping as needed
5d) Use bigger diameters or reduce the pump flow
5e) Check that the mains voltage is correct
5)
The pump
starts
and stops
repeatedly
5a) Pump with excessive flow
5b)
Repeated interventions of the
thermal protection
5c) Leakages on the system
5a) Partially close the delivery valve to reduce flow. The pump may be
oversized compared with the dynamic level of the well.
5b) Measure the current absorption. If necessary, properly calibrated
overload protection. Remove the pump and make sure the pump
shaft or the motor shaft turn freely. See also the case 1e).
5c) Check the leakage of the system and seal or replace the leaking
parts.
SD, SDX, SDS_Rev16.indd 13
18/11/16 15:10
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