Maintenance And Troubleshooting - Pentair SCM 4 PLUS 75/75 Bedienungs- Und Wartungsanleitung

WARNING
Do not run the pump with the interception valve on delivery completely closed.
WARNING
Do not run the pump in the opposite direction for more than 30 seconds.
WARNING
Complete all the electric and mechanic connections before starting the pump.
Before lowering the pump into the well it is necessary to control the direction of rotation of the motor to avoid da-
maging the thrust bearing. If the direction of rotation is correct, the hydraulic performances of the pump are com-
pliant 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.
CHAPTER 8

MAINTENANCE AND TROUBLESHOOTING

DANGER - ELECTRIC SHOCK RISK
Before doing any operation, make sure machine is disconnected from electric power supply.
Periodical maintenance should be performed according to the content of sand in water. In ordinary conditions, SCM
4 Plus® 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 submer-
sed.
USE AND MAINTENANCE MANUAL
EN
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