Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 34)

34 Rockwell Automation Publication 20P-UM001I-EN-P - February 2013
Chapter 1 Installation and Wiring
Safety Ground (PE)
This is the safety ground for the drive that is required by code. This point must be
connected to adjacent building steel (girder, joist), a floor ground rod or bus bar
(see above). Grounding points must comply with national and local industrial
safety regulations and/or electrical codes.
Power Feeder
Each power feeder from the substation transformer to the drive must be provided
with properly sized ground cables. The conduit or cable armor should be bonded
to the substation ground at both ends. Each transformer enclosure and/or frame
must be bonded to ground at a minimum of two locations.
Encoder/Resolver Ground Connections
If used, must be routed in grounded steel conduit. The conduit must be
grounded at both ends. The encoder/resolver cable shield must be connected to
the shield ground on the drive side. Do not connect the encoder/resolver cable
shield to ground on the motor side.
Tachometer Ground Connections
If used, ground connections must be routed in grounded steel conduit. The
conduit must be grounded at both ends. Ground the cable shield at the drive end
only using the shield clamps on the grounded metal plate supporting the control
board (see
Figure 52 on page 78 for shield clamp location).