4.3 Check the impeller rotation
CAUTION: Crush Hazard
The starting jerk can be powerful. Make sure nobody is close to the unit when it is started.
Check the direction of rotation each time the cable has been re-connected and after
phase or total supply failure.
1. Start the motor.
2. Stop the motor.
3. Check that the impeller rotates in the correct direction.
The correct direction of impeller rotation is clockwise when you look at the pump from
above. When started, the pump will react in the opposite direction to the impeller
rotation.
Figure 11: Start reaction
4. If the impeller rotates in the wrong direction, then do the following:
• If the motor has a 3-phase connection, then transpose two phase conductors and
repeat this procedure from step 1.
For 3-phase pumps with external starters or without built-in motor protection, the
phases must be shifted on the output terminal of the starter.
4 Installation
Flygt 2190, 2201 Installation, Operation, and Maintenance Manual 27
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