ZDS 02 Instructions D'installation Et Mode D'emploi page 11

9- MAINTENANCE
Before starting any maintenance, disconnect power to the motor and make sure the power supply
cannot be accidentally reconnected (Fig. 16)
• When troubleshooting the entire system, observe all the warnings provided by the manufacturer of the
motor and the pump.
• Do not modify or alter the motor or the corresponding electrical connections in any way.
• After completing the work, completely restore all the safety and protection devices, making sure they are
perfectly working.
10- TROUBLESHOOTING
PROBLEM
1- The motor does not start
or the pump does not deliver
water.
2- The motor protection cuts
soon after start.
3- The motor protection
cuts after long periods of
operation.
4- The motor rotates but the
flow rate or pressure are not
sufficient.
5- The motor rotates but
does not deliver water.
6-The pump starts and stops
too frequently.
CHECKS
A- Check that the motor is powered.
B- Check the presence of all the phases for
the three-phase motors.
C- Check that the pump is not dry running.
A- Check that the power supply voltage
corresponds to the rated voltage.
B- Check the presence of all the phases.
C- Check the setting of the protection and the
presence of possible open or dirty contacts.
D- Check that the temperature of the liquid is
not too high.
E- Check for the presence of excess friction
(scraping between rotating and fixed parts,
pump clogged by sand, etc.).
A- Check that all the phases are present and
that the voltage is sufficient.
B- Check for the presence of excess friction
(scraping between rotating and fixed parts,
pump clogged by sand, etc.).
A- Check correct rotation direction in the
three-phase versions.
B- Check that the pipes are not partially
clogged or leaking.
C- Check that the flow rate of the pump is
below that of the well.
D- Check wear on the pump.
A- Check that the level of the well has not
dropped excessively with consequent possible
dry operation.
B- Check that the head required is not higher
than the one of the pump.
C- Check correct rotation direction in the
three-phase versions.
D- Pump obstructed by impurities.
A- Check for leaks in the system.
B- Check correct operation of the non-return
valve.
C- Check efficiency of the pressure switch, if
used.
D- Check that the tank is sufficiently sized.
E- Check positioning of the probes protecting
against dry operation, if used.
SOLUTIONS
A- Check the fuses or re set the
switch.
B-Restore the missing phase.
C- Wait for the level of the well
to be restored naturally.
B- Restore the missing phase.
C- Restore the protections,
consulting the rating plate
specifications or replacing the
components involved.
E- Eliminate the cause of the
friction or remove any
obstructions from the pump.
A- Restore the missing phase.
B- Eliminate the cause of the
friction or remove any
obstructions from the pump.
A- lnvert any two phase leads.
B- Eliminate the obstructions or
leaks.
C- Replace the pump with one
with a lower flow rate.
D- Service the pump.
A- Wait for the natural level to be
restored or lower the level of the
well. Install adequate protection
against dry operation.
B- Replace the pump with one
having suitable characteristics.
C- lnvert two phase leads.
D- Clean the pump, filter and pipes.
A- Eliminate the leaks.
B- Repair or replace the valve.
C- Repair or replace the pressure
switch.
D- Replace it with one of adequate
capacity.
E- Reposition the probes to obtain
longer operating periods.
10
GB
D
F
I
E
PL
H
LT
RO
RUS