Motor Bearing Protection Guide

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Customers Using Siemen’s VFDs can benefit from the dV Sentry™ filter

A common method across industries is to use a shaft grounding brush or ring to protect motor bearings from common mode over voltage. A shaft grounding brush is not a filter, so it does not help reduce or protect equipment from the actual problem. The current is detected around the motor bearing to an alternative route, thus the current still exists and can cause widespread damage in many other areas in the system.

  • SP-004-E The dV Sentry™ is the only proven filter to provide common mode reduction, peak voltage protection, and rise time reduction – all in one unit.