EN
E-MXAM E-MXPM E-NGXM Rev3 - Operating Instructions
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13. 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) Shaft blocked
1c)
If the above causes have already
been checked, the engine may be
malfunctioning
1a) Check that the mains frequency and voltage correspond to the
electrical characteristics shown on the indicator plate
1b) Remove the cause of blockage as indicated in the “Blocked pump”
instruction booklet
1c) Repair or replace the engine by applying to an authorised service
centre
2)
Pump blocked
2a) Prolonged periods of inactivity with
formation of rust inside the pump
2b) Presence of solid bodies in the pump
rotor
2c) Bearings siezed
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 rotor, if necessary contact an authorised service
centre
2c) If the bearings are damaged replace them or if necessary contact an
authorised service centre
3)
The pump
functions
but no water
comes out
3a) Possible infiltration of air from suction
tube connections, drain plugs or filling
of pump or from the gaskets of the
suction pipe
3b) Foot valve blocked or suction pipe not
fully immersed in liquid
3c) Suction filter blocked
3d) Non-return valve blocked
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.
4)
The pump does
not stop
4a) Non-return valve broken, blocked or
clogged with solid parts.
4b) Stop pressure (parameter UP01) too
high.
4c) Insufficient pump performance
4a) Check the function of the integrated check 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 center.
5)
Insufficient flow
5a) Pipes and accessories with diameter
too small causing excessive loss of
head
5b) Presence of deposits or solid bodies in
the internal passages of the rotor
5c) Rotor deteriorated
5d) Worn rotor and pump case
5e)
Excessive viscosity of the liquid
pumped (if other than water)
5f) Suction head excessive in relation to
the suction capacity of pump
5g) Suction pipe too long
5a) Use pipes and accessories suitable for the specific application
5b) Clean the rotor and install a suction filter to prevent other foreign
bodies from entering
5c) Replace the rotor, if necessary, contact an authorised service centre
5d) Replace the rotor and the pump casing
5e) The pump is unsuitable
5f) Try to close the feeder gate partially and/or reduce the difference in
level of the pump and the liquid being aspirated
5g) Bring the pump closer to the suction tank so as to use a shorter pipe.
If necessary use a pipe of a wider diameter
6)
Noise and
vibrations
from the pump
6a) Rotating part unbalanced
6b) Worn bearings
6c) Pump and pipes not firmly attached
6d) Flow too strong for the diameter of the
delivery pipe
6e) Functioning in cavitation
6f) Unbalanced power supply
6a) Check that no solid bodies are obstructing the rotor
6b) Replace the bearings
6c) Anchor the delivery and suction piping as needed
6d) Use bigger diameters or reduce the pump flow
6e) Reduce the flow by adjusting the feeder gate and/or using pipes with
a bigger internal diameter. See point 5g) too
6f) Check that the mains voltage is right
7)
Leakage from
the mechanical
seal
7a) The mechanical seal has functioned
when dry or has stuck
7b) Mechanical seal scored by presence
of abrasive parts in the liquid pumped
7c) Mechanical seal unsuitable for the
type of application
7d) Slight initial drip during filling or on first
start-up
In cases 7a), 7b) and 7c), replace the seal, if necessary contact an
authorised service centre
7a) 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.
7b) Install a suction filter and use a seal suited to the characteristics of the
liquid being pumped.
7c) Choose a seal with characteristics suitable for the specific application
7d) Wait for the seal to adjust to the rotation of the shaft. If the problem
persists, see points 7a), 7b) or 7c) or contact an authorised service centre.
E-MXAM E-MXPM E-NGXM Rev3.indd 15
17/05/19 08:13
