6 | Installation
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0870S03226_VRD 2072-3108_-
6.3 Electrical connection
Danger from electric shock!
Electric shock will cause death or serious injury.
• All live lines must be powered down before the electrical installation!
• Before any electrical work, ensure that the vacuum pump is disconnected from the
power supply and secured against accidental activation.
• Electrical installation work must only be performed by trained specialists.
Incorrect rotation of drive motors can seriously damage the vacuum system!
Switch vacuum pumps briefly on and off again to check the rotational direction of the
motor. The rotational direction is marked by a direction of rotation arrow on the motor.
If the direction is wrong, reverse two connection phase poles.
6.3.1 Connection of the power supply
Danger of damage to the vacuum system.
Wrong connection.
Wire the vacuum system according to the circuit diagram in the switch and control cabi-
net.
Procedure:
• Ensure that the power supply for the vacuum system corresponds to the specifications
in the circuit diagram.
• Ensure that the vacuum system is not impaired by electrical or electromagnetic impuls-
es of the power supply. Contact Busch if necessary.
• Connect the switch and control cabinet to the power supply (for connection values, see
chap. 14).
Danger of damage to the motor
Wrong rotating direction.
• Operation in the wrong rotating direction may damage the vacuum system after a
very brief time. Ensure that the rotating direction is correct before commissioning.
• Use the glued-on/cast-in arrow to determine the intended rotating direction.
• Switch on the vacuum pump for a fraction of a second.
• Observe the fan wheel and determine the rotating direction just before standstill.
To change the rotating direction:
• Swap any two phases of the power supply.
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