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14. TROUBLESHOOTING
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.
OFF
Strictly follow the user instructions and if necessary contact an authorised service centre.
PROBLEM
PROBABLE CAUSES
1)
1a) Unsuitable power supply
The motor does
1b) Shaft blocked
not start
1c) If the above causes have already
been
malfunctioning
2)
2a) Prolonged periods of inactivity with
Pump blocked
formation of rust inside the pump
2b) Presence of solid bodies in the pump
impeller
2c) Bearings siezed
3a) Possible infiltration of air from suction
3)
The pump
tube connections, drain plugs or filling
works
of pump or from the gaskets of the
but no water
suction pipe
comes out
3b) Foot valve blocked or suction pipe not
fully immersed in liquid
3c) Suction filter blocked
3d) Non-return valve blocked
4)
4a) Non-return valve broken, blocked or
The pump does
clogged with solid parts.
not stop
4b) Stop pressure (parameter UP01) too
high.
4c) Insufficient pump performance
4d) Incorrect membrane pressure, empty or
broken membrane
5)
5) Resonances
intermittent
hydraulic system control dynamics
operation
6)
6a) Pipes and accessories with diameter
Insufficient flow
too small causing excessive loss of
head
6b) Presence of deposits or solid bodies
in the internal passages of the impeller
6c) Impeller deteriorated
6d) Worn impeller and pump casing
6e) Excessive viscosity of the liquid
pumped (if other than water)
6f) Suction head excessive in relation to
the suction capacity of the pump
6g) Suction pipe too long
7)
7a) Rotating part unbalanced
Noise and
7b) Worn bearings
vibrations
7c) Pump and pipes not firmly attached
from the pump
7d) Flow too strong for the diameter of the
delivery pipe
7e) Operation in cavitation
7f) Unbalanced power supply
8)
8a) The mechanical seal has operated
Leakage from
when dry or has stuck
the mechanical
8b) Mechanical seal scored by presence
seal
of abrasive parts in the liquid pumped
8c) Mechanical seal unsuitable
type of application
8d) Slight initial drip during filling or on first
start-up
Changes reserved.
META_S_Rev6-s11 - Operating Instructions
checked, the motor may be
between
pump
and
for the
POSSIBLE REMEDIES
1a) Check that the mains frequency
electrical characteristics shown on the plate
1b) Remove the cause of blockage as indicated in the "Blocked pump"
instruction booklet
1c) Repair or replace the motor by contacting an authorised service centre
2a) Unblock the pump by using a screw driver to turn the relevant notch on
the back of the shaft (remember to turn off the electricity supply first )
or contact an authorised service centre
2b) If possible, dismantle the pump casing and remove any solid foreign
bodies inside the impeller, if necessary contact an authorised service
centre
2c) If the bearings are damaged replace them or if necessary contact an
authorised service centre
3a) Check which part is not tight and seal the connection adequately
3b) Clean or replace the bottom valve and use a suction pipe suitable for
the application
3c) Clean the filter, if necessary, replace it . See point 2a) also.
3d) Verify that the integrated non-return valve is working properly.
4a) Check the operation of the integrated non-return valve and remove the
solid parts present in the valve.
4b) Check the value of parameter UP01 and if necessary reduce it.
4c) Contact an authorised service centre.
4d) Check the membrane pressure, if necessary install a tank of maximum
8 litres.
5) Set AP05 = 1
6a) Use pipes and accessories suitable for the specific application
6b) Clean the impeller and install a suction filter to prevent other foreign
bodies from entering
6c) Replace the impeller, if necessary, contact an authorised service centre
6d) Replace the impeller and the pump casing
6e) The pump is unsuitable
6f) Try to close the delivery gate valve partially and/or reduce the difference
in level of the pump and the liquid being sucked
6g) Bring the pump closer to the suction tank so as to use a shorter pipe.
If necessary use a pipe of a wider diameter
7a) Check that no solid bodies are obstructing the impeller
7b) Replace the bearings
7c) Anchor the delivery and suction piping as needed
7d) Use bigger diameters or reduce the pump flow
7e) Reduce the flow by adjusting the delivery gate valve and/or using
pipes with a bigger internal diameter. See point 6g) too
7f) Check that the mains voltage is suitable
In cases 8a), 8b) and 8c), replace the seal, if necessary contact an
authorised service centre
8a) Make sure that the pump casing (and the suction pipe if the pump is
not self-priming) are full of liquid and that all the air has been expelled.
See point 6e) too.
8b) Install a suction filter and use a seal suitable for the characteristics of
the liquid being pumped.
8c) Choose a seal with characteristics suitable for the specific application
8d) Wait for the seal to adjust to the rotation of the shaft. If the problem
persists, see points 8a), 8b) or 8c) or contact an authorised service centre.
and voltage correspond to the
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