Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control User Manual
Page 70
70
Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
Chapter 3
Component Definition and Maintenance
6.
Slide the circuit board straight out.
7.
While grounded, remove the SGCT from its anti-static bag.
8.
Clean the heat sink with a soft cloth and rubbing alcohol.
9.
Apply a thin layer of Electrical Joint Compound (Alcoa EJC No. 2 or
approved equivalent) to the contact faces of the new SGCTs. 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.
10.
Slide the SGCT into place until the mounting brackets contact the surface
of the heat sink and tighten the captive screws located in the brackets.
11.
Follow procedure
Uniform Clamping Pressure on page 88
heat sinks 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 (do not exceed the bend
radius).
ATTENTION: Static charges can damage or destroy the SGCT. Properly ground
yourself before removing the replacement SGCT from the protective anti-static
bag. Using damaged circuit boards may also damage related components. Use a
grounding wrist strap for handling sensitive circuit boards.
IMPORTANT
SGCTs come in matched sets in systems with more than one device per leg.
When replacing the device, you must replace all SGCTs in the set even if only
one has failed. Arrange the devices from left to right in sets (i.e. set 1+2, 3+4,
5+6).
IMPORTANT
Too much joint compound may result in contamination of other surfaces
leading to system damage.