9
GB
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.
WARNING
Use the hydraulic unit within the operating limits indicated
on the nameplate or the datasheet.
WARNING
Never run the pump in dry conditions, even for short
intervals of time.
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.
CH. 8 - MAINTENANCE AND TROUBLESHOOTING
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
DANGER
Electric shock
risk
Before doing any operation, make sure machine is
disconnected from electric power supply.
4
GB
Electric connections must be carried out by skilled staff only, in accordance with the manufacturer's instructions
enclosed to the electric equipment and the motor. It is advisable to install a protection device upstream, of adequate
dimensions (in accordance with the current values indicated on the nameplate) to prevent voltage peaks and
overloads.
Cables should be selected in function of the absorption in Ampere, indicated on the nameplate. Cables should be
dimensioned in accordance to the power to transmit, of the distance from the control page and the starting system
of the submersed motor. Cables should guarantee a submersed operation, have waterproof joints and show no signs
of abrasions or holes.
The control board should be equipped with all the protection devices and equipment to manage and drive the hydraulic
unit. More specifically, it is necessary to guarantee a protection against overcurrent and short circuits. Protections
against the loss of phases, the lowering of voltage and the lack of water in the well are recommended but not
compulsory.
