Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control User Manual
Page 76
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Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014
Chapter 3
Component Definition and Maintenance
5.
Slide the circuit board straight out.
6.
Clean the heatsink with a soft cloth and rubbing alcohol.
7.
While grounded, remove the SGCT from the anti-static bag in which it is
supplied.
8.
Apply a thin layer of Electrical Joint Compound (Alcoa EJC No. 2 or
approved equivalent) to the contact faces of the new SGCTs to be
installed. The recommended procedure is to apply the compound to the
pole faces using a small brush, and then gently wipe the pole face with an
industrial wipe so that a thin film remains. Examine the pole face before
proceeding to ensure that no brush bristles remain.
9.
Slide the SGCT into place until the mounting brackets contact the surface
of the heatsink.
10.
Tighten the captive screws located in the brackets.
11.
Follow procedure
Uniform Clamping Pressure on page 82
heatsinks are clamped to a uniform pressure.
If equipped, re-install the SPS board and mounting bracket, and reconnect
the snubber connection to J1 of the SPS board.
12.
Connect the power cable and fiber optic cables (ensure the bend radius is
not exceeded)
ATTENTION: The SGCT can be destroyed or damaged by static charges.
Personnel must be properly grounded before removing the replacement SGCT
from the protective anti-static bag that it is supplied in. Use of damaged circuit
boards may also damage related components. A grounding wrist strap is
recommended for handling sensitive circuit boards.
IMPORTANT
Replacement SGCTs will be supplied, grouped in matched sets. This means that
all of the SGCTs in a leg have been grouped together based on their electrical
performance. Grouping similarly matched devices ensures balanced load
sharing of a leg of devices. When replacing the device, it is necessary to replace
all the SGCTs in a matched set, even if only one has failed.
IMPORTANT
Too much joint compound may result in contamination of other surfaces
leading to system damage.