Rockwell Automation 23P PowerFlex Digital DC Drive - Manual (Page 33)

Rockwell Automation Publication 20P-UM001K-EN-P - July 2014 33
Installation and Wiring Chapter 1
Safety Ground (PE)
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
Figure 9 on page 32 ). Ground points must comply with national and local
industrial safety regulations and electrical codes.
Power Feeder
Each power feeder from the substation transformer to the drive must be provided
with properly sized ground cables. Bond the conduit or cable armor to the
substation ground at both ends. Each transformer enclosure or frame must be
bonded to ground at a minimum of two locations.
Encoder/Resolver Ground Connections
If used, the encoder or resolver ground connections 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
by using only the shield clamps on the grounded metal plate that supports the
control board (see
Figure 58 on page 81 for shield clamp location).