Are Aaki Motor Shaft Grounding Modules used mostly for repair work or would you get one of these prior to even installing the motor?

When electric motors are being driven by VFD’s there is a likely chance that the bearings will fail without a MSGM installed.

MSGMs are almost always installed when a motor sent in for repair was being driven by a VFD.

However, many of our customers put these on brand new motors prior to commissioning.

The reason is simple:  When a motor fails when on a VFD, its difficult to determine the exact cause.  Bearing failures can be a result of poor shaft alignment, improper greasing, contamination of the bearing, overloading of the shaft, out of tolerance speed or load conditions, and Variable Frequency Drive setup.

Regardless of what the culprit was, the motor repair shop is often left holding the bag in an attempt to help out a good customer.  So the fractional cost of putting a MSGM on as a failure prevention component will save both the repair shop and the end customer time, reputation, and money.

Basically its cheap insurance.