Pentair Sta-Rite SCM 4 PLUS Instructions De Service page 17

PROBLEM
POSSIBLE CAUSE REMEDY
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
THE PUMP YIELDS LOW FLOW RATES AND
HEADS
THE PUMP DOESN'T PROVIDE WATER
POSSIBLE CAUSE
1) No voltage or incorrect voltage.
2) The command panel is not connected properly.
3) The pump is blocked.
4) Interrupted circuit in the cable or motor winding.
5) The differential switch has tripped.
1) Low voltage.
2) Overload originating from sand clogging.
3) Bearings tend to block
4) The current that passes through the windings
is 1.5-2 above the rated value (single-phase
versions).
5) The differential switch has tripped.
6) The pump is blocked in a non perfectly vertical
well.
1) Leakage in the installation.
2) Electric pump capacity too high with respect to
the well (level probes intervene).
3) Pressure switch not correctly calibrated (use
with autoclave).
4) Tank saturated with water.
5) Autoclave tank too small.
1) IIncorrect direction of rotation (three-phase
versions).
2) Leakage in the installation.
3) Filter is clogged or sand in electric pump.
4) Electric pump worn out.
5) The pressure head has been incorrectly
calculated.
1) The water level in the well is lower than the
suction level or the stratum has lowered.
2) The valves are blocked or positioned in the
opposite direction.
3) Leaks in the delivery hose.
4) Pump or suction filter clogged with sand.
5) Incorrectly calculated load losses.
6) Worn pump.
7) The voltage is below the rated value and the
absorption is higher than usual.
8) The absorbed current is below ordinary values
because of the presence of air inside the pump.
REMEDY
Check that there is electricity and verify voltage with data
on motor plate.
Correctly connect the control panel.
Remove obstacle from electric pump.
Use an Ohmmeter to control the continuity of the electric
system.
Reset switch, if it trips again call a qualified electrician.
Increase the diameter of the supply line.
Extract the pump, repair it and clean it.
Check the voltage on the phases, inspect the condition of
the fuses and of the starter contacts.
Reset the switch. If the switch continues to trip, contact a
qualified electrician.
Move the pump to the correct position and restart it.
Find leak and repair it.
Reduce amount of incoming water from source.
Adjust calibration.
Restore correct tank functioning.
Replace the tank.
Reverse two power supply phases in the command panel.
Find leak and repair it.
Remove the unit and clean the filter.
Extract the pump, inspect it and replace the worn parts
or the pump.
Revise calculations and replace the pump, if necessary.
Check the stratum level during the pump operation and
reposition the pump into the well.
Check the valves. If they are blocked, slightly hit the
delivery line in the attempt of moving the valve.
Inspect the line, find possible leaks and repair them.
Extract the pump and clean the filter and the parts
clogged with sand.
Revise the calculations and use a hose with a larger
diameter or replace the pump.
Replace the pump.
Increase the voltage. Increase the diameter of the supply
cable.
Start the pump and stop it at intervals of about one
minute.
EN
15