Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 320)

6-30 Component Definition and Maintenance
7000-UM150I-EN-P – June 2013 7000 “B” Frame
I M P O R T A N T I M P O R T A N T SGCTs come in matched sets in systems with
more than one device per leg. When replacing the
device, it is necessary to replace both SGCTs in the
pair even if only one has failed. The devices are
arranged from left to right in pairs (i.e. pairs 1+2,
3+4, 5+6).
7. While grounded, remove the SGCT from the anti-static bag it is
supplied in.
8. Clean the heatsink 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
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.
I M P O R T A N T I M P O R T A N T Too much joint compound may result in
contamination of other surfaces leading to system
damage.
10. Slide the SGCT into place until the mounting brackets contact
the surface of the heatsink.
11. Tighten the captive screws located in the brackets.
12. Follow procedure “Uniform Clamping Pressure” to ensure the
heatsinks are clamped to a uniform pressure.
13. Connect the power cable and fiber optic cables (ensure the bend
radius is not exceeded).