Connect the three phase motor with star circuit
► Connect the three phase motor according to the connection diagram.
5.13 Checking the direction of rotation
NOTICE
Motor damage from overheating
Limited fan cooling capacity, caused by incorrect rotation direction, causes the motor to overheat.
► Check the direction of rotation using the rotation direction arrow on the fan of the motor.
► If the rotation direction is incorrect, switch 2 of the 3 phases.
► When doing so, make sure that the air flow is sucked through the ventilation grille, and directed
over the motor to be cooled.
1
2
Fig. 24:
Checking the direction of rotation
1
Vacuum connection
2
Motor fan
Procedure
1. Switch on the vacuum pump briefly (2 to 3 seconds).
2. Check the fan’s rotation of direction on the motor. The motor fan and the coupling rotate in a
clockwise direction.
3. If the direction of rotation is incorrect, exchange the 2 phases of the connecting cable in the motor
terminal box.
5.14 Connecting the PTC thermistor tripping unit
Tripping units store the shut-down
Pfeiffer Vacuum recommends connecting motors with PTC in the stator winding to a PTC
resistor tripping device for protection against overload.
Installation
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