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Grounding

Safety Ground - PE

The drive safety ground – PE must be connected to system or earth ground.  This is the safety ground for the drive that is required by code.  This point must be connected to adjacent building steel (or other acceptable ground).  Grounding points must comply with national and local industrial safety regulations or electrical codes.

Motor Grounding

The motor frame must be connected directly to the drive PE connection with a separate ground conductor.  It is recommended that each motor frame be grounded to building steel at the motor.

It is important to take care when installing the PWM AC drive because output can produce high frequency common mode (coupled from the output to ground) noise which may cause sensitive equipment to malfunction.  The grounding system used can greatly affect the amount of noise and its impact on the system.  The fully grounded system in the diagram represents the desired ground implementation.

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