PowerFlex Digital DC Drive User Manual -
Publication 20P-UM001C-EN-P - July 2008
Installation and Wiring
1-13
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 Ground Connections
If used, must be routed in grounded steel conduit. The conduit must be
grounded at both ends. The encoder cable shield must be connected to the
shield ground on the drive side. Do not connect the encoder 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 (refer to
I/O Terminal Block Locations on page 1-36
shield clamp location).
Power Circuit Protection
It is recommended that you install the PowerFlex DC drive with fast acting
fuses to protect the armature converter on the AC input and DC output (for
four quadrant drives only) sides. Internally mounted fuses for armature
converter protection are provided with 230V, 521A and 460V, 495A and
667A frame C PowerFlex DC drives. Refer to
for a list of replacement fuses and general fuse
locations.
