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WARNING
Turning the switch too slowly will cause the motor's thermal protection to trip. Return
the switch to the neutral position and switch it on again.
5.3 Checking the direction of rotation
WARNING
This test may only be performed by authorized personnel with the appropriate
training.
To check the direction of rotation the motor must be switched on briefly. The motor must not be allowed
to reach the normal operating speed.
A phase rotation indicator light is mounted in the star/delta switch box. If the phase is rotating in the
wrong direction, the phase rotation indicator light will be lit. When the phase and direction of rotation are
correct, the light will be off.
Note
If the direction of rotation is incorrect, the connection on the terminal board must be changed or, if a
phase reversal plug is present, the pins of the plug must be reversed.
