Facts on shaft voltages from Electro Static Technology:
BEARING PROTECTION FACTS:
Bearing protection for motors and attached equipment: Only AEGIS™ SGR will protect both motor bearings and the bearings in attached equipment. VFD induced currents on the shaft can discharge through motor bearings or coupled equipment like gear boxes, pumps. fan bearings, pillow blocks, encoders, brake motors, etc. AEGIS™ SGR addresses the root of the problem and channels harmful currents to ground.