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5.4 Electrical Connection
(for Variable-frequency Drive)
DANGER
Live wires.
Risk of electrical shock.
• Electrical installation work must only be executed by qualified personnel.
• Make sure that the power supply for the drive is compatible with the data on the
nameplate of the variable-frequency drive.
• Make sure that the motor of the machine will not be affected by electric or electro-
magnetic disturbance from the mains; if necessary seek advice from Busch.
• Make sure that the EMC-class of the machine confirms with the requirements of
your supply network system, if necessary provide further interference suppression
(EMC-Class of the machine see
• We recommend to use gG/gL (IEC 60269-1) (class T for UL/CSA) 25 A fuses. Make
sure that the response time is below 0.4 seconds.
In case of using a residual current protective device:
• Use an all-current sensitive residual current protective device (type B).
• Electrically connect the variable-frequency drive (VFD).
5.4.1 Wiring Diagram Three-Phase Motor
NOTICE
Incorrect direction of rotation.
Risk of damage to the machine!
• Operation in the wrong direction of rotation can destroy the machine in a short time!
Prior to start-up, ensure that the machine is operated in the right direction.
• Determine the intended direction of rotation with the arrow (stuck on or cast).
• Jog the motor briefly.
If the rotation of the motor must be changed:
• Switch any two of the motor phase wires.
Delta connection (low voltage):
Star connection (high voltage):
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