Flotec SCM 4 PLUS Manuel D'utilisation Et D'entretien page 8

CH. 7 - STARTING THE UNIT
WARNING
WARNING
WARNING
WARNING
WARNING
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
DANGER
Electric shock
risk
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 submersed.
Use the hydraulic unit within the operating limits indicated
on the nameplate or the datasheet.
Never run the pump in dry conditions, even for short
intervals of time.
Do not run the pump with the interception valve on
delivery completely closed.
Do not run the pump in the opposite direction for more
than 30 seconds.
Complete all the electric and mechanic connections
before starting the pump.
Before doing any operation, make sure machine is
disconnected from electric power supply.
GB GB
PROBLEM
THE PUMP DOESN'T START,
BUT THE FUSES TRIP AND THE
STARTER RELAYS CANNOT BE
ENABLED
THE PUMP STARTS, THE FUSES
TRIP AND THE STARTER
RELAYS ARE ENABLED
THE PUMP STARTS TOO OFTEN 1) Leakage in the installation.
THE PUMP YIELDS LOW FLOW
RATES AND HEADS
THE PUMP DOESN'T PROVIDE
WATER
9 10
POSSIBLE CAUSE
1) Check that there is electricity and verify voltage with
1) No voltage or incorrect voltage.
data on motor plate.
2) The command panel is not
2) Correctly connect the control panel.
connected properly.
3) The pump is blocked.
3) Remove obstacle from electric pump.
4) Interrupted circuit in the cable or
4) Use an Ohmmeter to control the continuity of the
motor winding
electric system
5) The differential switch has
5) Reset switch, if it trips again call a qualified electrician.
tripped.
1) Increase the diameter of the supply line.
1) Low voltage
2) Overload originating from sand 2) Extract the pump, repair it and clean it.
clogging. Bearings tend to block
3) Check the voltage on the phases, inspect the condition
3) The current that passes through
the windings is 1.5-2 above the of the fuses and of the starter contacts.
rated value (single-phase
versions)
4) Reset the switch. If the switch continues to trip, contact
4) The differential switch has
tripped. a qualified electrician
5) The pump is blocked in a non 5) Move the pump to the correct position and restart it.
perfectly vertical well
1) Find leak and repair it.
2) Electric pump capacity too high 2) Reduce amount of incoming water from source.
with respect to the well (level
probes intervene).
3) Pressure switch not correctly 3) Adjust calibration.
calibrated (use with autoclave).
4) Tank saturated with water. 4) Restore correct tank functioning.
5) Autoclave tank too small. 5) Replace the tank.
1) IIncorrect direction of rotation 1) Reverse two power supply phases in the command
(three-phase versions) panel.
2) Leakage in the installation. 2) Find leak and repair it.
3) Filter is clogged or sand in 3) Remove the unit and clean the filter.
electric pump.
4) Electric pump worn out. 4) Extract the pump, inspect it and replace the worn parts
or the pump
5) The pressure head has been 5) Revise calculations and replace the pump, if necessary
incorrectly calculated
1) The water level in the well is 1) Check the stratum level during the pump operation and
lower than the suction level or reposition the pump into the well
the stratum has lowered
2) The valves are blocked or 2) Check the valves. If they are blocked, slightly hit the
positioned in the opposite delivery line in the attempt of moving the valve
3) Inspect the line, find possible leaks and repair them
direction
3) Leaks in the delivery hose
4) Pump or suction filter clogged 4) Extract the pump and clean the filter and the parts
with sand clogged with sand
5) Revise the calculations and use a hose with a larger
5) Incorrectly calculated load
losses diameter or replace the pump
6) Worn pump 6) Replace the pump
7) Increase the voltage. Increase the diameter of the
7) The voltage is below the rated
supply cable
value and the absorption is
higher than usual
8) The absorbed current is below 8) Start the pump and stop it at intervals of about one
minute
ordinary values because of the
presence of air inside the pump
REMEDY