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6.6 Operation
ATTENTION !
Never let the pump run dry, however briefly.
- Recheck the electrical connections, the electrical protection, and
the rating(s) of the fuse(s).
- Measure the current on each phase and compare with the nomi-
nal values marked on the data plate.
- Do not exceed the current rating of the motor.
- Measure the supply voltage with the motor running.
Acceptable tolerance : ± 6 %, in 50 Hz, ± 10 % in 60Hz.
- Drive all air out of the discharge tube to avoid a ram effect when
starting.
Ambient temperatures
Submersible motors are designed to run at nominal power at a maxi-
mum water temperture of 40°C. the circulation speed along the
motor must be at least 8 cm/s for 3" motor to ensure an adequate
cooling.
When use at high water temperature, the load must be reduced in
8. OPERATING TROUBLE
POWER TO THE MODULE MUST BE OFF before any
ATTENTION !
work is done.
TROUBLE
8.1 THE PUMP FAILS TO
a) Incorrect voltage or voltage drop
START, OR STOPS
b) Open-circuit in motor power cord.
c) The motor protection trips out.
8.2 DELIVER OR THE
a) Voltage too low.
DISCHARGE FLOW
b) Suction strainer clogged.
IS TOO SMALL
c) Wrong direction of rotation
(three-phase motor).
d) No water in borehole, or level too
low.
8.3 PUMP STARTS TOO
a) Differential on pressure-sensitive
OFTEN
switch too small.
b) Electrodes incorrectly placed.
c) The bladder vessel is too small or is
insufficiently pressurized.
CAUSE
a) Check the voltage during starting; if the cable cross-section is too small,
b) Measure the resistance between phases. Refit the pump if necessary
c) Check the current setting on the thermal relay and compare it to the
a) Check the supply voltage at the box.
b) Refit the pump; unclog and clean.
c) Interchange two phase wires at the box.
d) Check the level; it must be at least 0.20 m above the pump discharge
a) Increase the Stop/Start difference.
b) Adjust the distance between them so that the time between the stop-
c) Check and adjust the pressures (On/Off).
proportion to the nominal current of the motor according to the
table hereafter.
Water temperature
40°C (104°F) to <50° (122°F)
> 50°C (122°F)
1
(
) With motor modification or power increase.
Do not use motors in ambient temperatures exceeding 50°C.
The freezing point of the motor filling is -15°C.
7. MAINTENACE
No specific maintenance during operating.
7.1 Spare parts
For repair of the hydraulic part of the motor (ask us).
REMEDIAL ACTION
the voltage drop may be such that the motor cannot function normally.
and check the cable.
indicated value.
Important : do not insist if the relay trips out repeatedly (try to locate
the cause); forced operation of the unit could damage the motor (by
overheating) in a very short time (about a minute).
(with pump running).
ping and starting of the pump is reasonable.
Check the pressure in the vessel.
Add a vessel to increase capacity or change to a larger vessel.
9
Max. nominal current of the motor
in % 0,37 to 1,1 kW
90
(
1
)
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