ENGLISH
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6.4 Sensor (water in the oil) (not available for explosion-proof versions)
The sensor probe inserted in the oil chamber detects any presence of water in the oil when the water percentage exceeds a
predetermined value.
When the water level in the oil is reached, the probe closes the circuit between the sensor (contact S1 on wiring diagram) and the
equipotential contact of the pump.
The probe must be connected to a suitable device in the control panel; the device may give an acoustic alarm or a luminous signal or,
when requested, it may stop the electropump.
If the signal is activated you must stop the electropump, dismantle it and check the state of the oil, the mechanical seals, and look for the
causes of intervention.
7. START-UP
Before starting work on the pump, check that the main switch is off.
It must be ensured that the power supply cannot be accidentally switched on.
Make sure that all protective equipment has been connected correctly.
The pump must not run dry.
The pump must not be started if the atmosphere in the tank is potentially explosive.
Before starting the pump, check that it is suitably connected to the pumping system to avoid uncontrolled leakage
of liquid.
Do not put your hands or any tool into the pump suction or discharge port after the pump has been connected to
the power supply.
7.1 General start-up procedure
This procedure applies to new installations as well as after service inspections if start-up takes place some time after the pump was
placed in the tank.
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After long periods of storage, check the conditions of the oil in the oil chamber. See also section 8.1 Routine maintenance.
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Check that the system, bolts, gaskets, pipework and valves etc. are in correct condition.
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Mount the pump in the system.
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Switch on the power supply.
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Check whether the monitoring units, if used, are operating satisfactorily.
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Check the setting of the float switches or of the level sensors.
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Check that the impeller can turn freely by briefly starting the motor.
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Check the direction of rotation. See section 7.2 Direction of rotation.
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Open the isolating valves, if fitted.
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Check that the liquid level is above the motor for S1 operation and above the cable entry for S3 operation. See fig. 9. If the
minimum level is not reached do not start the pump.
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Start the pump and let the pump run briefly, and check if the liquid level is falling.
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Observe if the discharge pressure and input current are normal. If not there might be air trapped inside the pump (See section 5
Installation).
In case of abnormal noise or vibrations from the pump, other pump failure or power supply failure or water supply
failure, stop the pump immediately. Do not attempt to restart the pump until the cause of the fault has been found
and the fault corrected.
After one week of operation or after replacement of the shaft seal, check the condition of the oil in the chamber. For pumps without
sensor, this is done by taking a sample of the oil. See section 8. Maintenance and service for procedure. Every time the pump has been
removed from the tank, go through
the above procedure when starting up again.
7.2 Direction of rotation
The pump may be started for a very short period without being submerged to check the direction of rotation.
Check the direction of rotation before starting up the pump. An arrow on the motor housing indicates the correct direction of rotation.
Correct direction of rotation is clockwise when viewed from above.
