Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 322)

6-32 Component Definition and Maintenance
7000-UM150I-EN-P – June 2013 7000 “B” Frame
A T T E N T I O N A T T E N T I O N The SCR and SCR SPGD Board can be
destroyed or damaged by static charges.
Personnel must be properly grounded before
removing the replacement SCR and SCR SPGD
Board 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.
I M P O R T A N T I M P O R T A N T Never adjust the orientation of the SCR using the
Gate and Cathode Leads. These connections are
sensitive and the device orientation should only
be adjusted by turning the device itself.
TO REPLACE THE SCR, FOLLOW STEPS 8-11, and 16-18.
TO REPLACE THE SCR SPGD BOARD, FOLLOW STEPS 12-15,
and 16-18.
8. Loosen the tie wrap holding the G-C wire in place, and remove
the device from the assembly.
9. Install the new device in the same position and using the same
orientation as the original SCR, and firmly secure the G-C wires
with the same tie wrap.
10. Connect the Gate-Cathode phoenix connector to the Gate Driver
Board
11. Apply a thin layer of Electrical Joint Compound ( Alcoa EJC
No.2 or approved equivalent ) to the contact faces of the new
SCRs to be installed. The recommended procedure is to apply
the compound to the pole faces using a small brush and then
gently wiping 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.