NOCCHI K Série Manuel D'utilisation Et D'entretien page 11

CH. 7 - STARTING THE UNIT
Before lowering the pump into the well it is necessary to control the direction of rotation of the motor to avoid damaging
the thrust bearing. If the direction of rotation is correct, the hydraulic performances of the pump are compliant with
those indicated in the catalogue. To perform this check it is necessary to start the pump with a partially opened gate.
When the water starts flowing in, further close the gate and verify that the pressure value is above the one indicated
on the nameplate. If this not occurs, the motor is rotated in the opposed direction. To resume the correct direction of
rotation, invert the two phases on the control panel. The motor of the pump should not rotate in the opposite direction
for above 30 seconds.
After verifying the direction of rotation, allow the pump to run reducing the opening of the valve to about half the
maximum opening, for about one minute. Stop the pump to remove gas pockets from the hydraulic unit, since their
presence could prevent the correct lubrication of the shaft. This interval should always be below 5 minutes. After
performing this operation, restart the machine by gradually opening the delivery valve until all the sand has been
removed or has reached minimum levels (40 g/m3). If the well has been built and drained correctly, this operation can
be performed in about 20 minutes. After the completion of this phase, it is possible to connect the delivery hose of the
pump. Before starting the pump is final mode, check:
- the continuity of the electric circuit to make sure that no damages have occurred during the lowering in the well
- the insulation resistance to ground, that is the related value between the cable terminals and the drainage pipe
- the performances of the pump, that should always be within the operating range
- the value of the current supplied to the control board, that should always be below the one indicated on the motor
nameplate
If necessary, partially open the gate or adjust the pressure switches. If abnormal operating conditions are reported
during the start-up phase, stop the machine, establish the cause and remove the pump from the well, if necessary.
CH. 8 - MAINTENANCE AND TROUBLESHOOTING
Periodical maintenance should be performed according to the content of sand in water. In ordinary conditions,
K-SERIES, SCM 4 Plus®, SCM 4 HF and SA 6 pumps do not require servicing. To prevent possible failure, it is
advisable to periodically control the flow rate and current absorption. A fall below 50% in the flow rate, as compared
to the rated value, indicates that the pump is worn. Similarly, an increase of the current absorption above 5%
indicates the presence of abnormal mechanical failures in the pump and/or motors. In many cases, it is necessary
to replace the worn parts, like impellers, O-rings and bearings. If the content of sand in pumped water is high, it is
advisable to inspect the pump for the first time after about one thousand operating hours. If the pump is left idle in
the well for long intervals of time, it is advisable to start it and allow it to run for a short time every 2-3 months. Always
make sure that the unit is completely submersed.
Use the hydraulic unit within the operating limits indicated
WARNING
on the nameplate or the datasheet.
Never run the pump in dry conditions, even for short
WARNING
intervals of time.
Do not run the pump with the interception valve on
WARNING
delivery completely closed.
Do not run the pump in the opposite direction for more
WARNING
than 30 seconds.
Complete all the electric and mechanic connections
WARNING
before starting the pump.
Before doing any operation, make sure machine is
DANGER
Electric shock
disconnected from electric power supply.
risk
GB
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