Frame d, Isolation transformers / line reactors – Rockwell Automation 20P PowerFlex Digital DC Drive User Manual
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Rockwell Automation Publication 20P-UM001I-EN-P - February 2013
Chapter 1
Installation and Wiring
Frame D
For any protective cover, loosen, but do not remove, the Hexalobular head screws
that secure the cover to the drive frame. Then, slide the cover up until the screw
heads line up with the key holes and lift the cover off the chassis. The top and
bottom most covers are also secured by screws at the top and bottom of the drive,
respectively.
Isolation Transformers / Line
Reactors
When connecting the drive directly to the main distribution system an isolation
transformer and/or 3…5% impedance AC line reactor must be used to guard
against system disturbance. If the isolation transformer provides the required
3…5% impedance, a line reactor is not required.
See Isolation Transformers on page
for a list of recommended isolation
transformers.
See AC Input Line Reactors and AC Input Contactors on page
for a list of
recommended AC line reactors. The type of line reactor used depends upon the
following:
•
the current absorbed by the AC input
•
the AC input voltage
•
the relative short circuit voltage
•
the AC input frequency