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8.4 CHECKING THE DIRECTION OF ROTATION (for three-phase motors)
Fig.2
CAUTION! ALWAYS FOLLOW THE SAFETY REGULATIONS
The direction of rotation must be checked each time a new installation is carried out.
Proceed as follows:
1. Place the pump on a flat surface.
2. Start the pump and stop it immediately.
3. Carefully observe the kick-back on starting, looking at the pump from above. If the direction of
rotation is correct, the upper cap will turn counter-clockwise as indicated by the arrows in the
drawing (Fig. 2).
If it is not possible to check as described above because the pump is already installed, check as
follows:
1. Start the pump and observe the water flow rate.
2. Stop the pump, switch off the power and invert two phases on the supply line.
3. Restart the pump and check the water flow rate again.
4. Stop the pump.
The correct direction of rotation is the one that gives the higher flow
9 START-UP
9.1
Turn the differential magnetothermal switch upstream from the pump to position I (ON) and
wait until the water comes out of the delivery pipe.
If malfunctions are found, disconnect the pump from the power supply, turning the differential
magnetothermal switch to position 0 (OFF) and consult the chapter 13 on "TROUBLESHOOTING".
The pump may be started and stopped:
- Manually by means of the differential magnetothermal switch upstream from the system.
- Automatically when water level rises, for versions with a float switch.
ENGLISH
15
rate.
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