Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 375)

Component Definition and Maintenance 6-31
7000 “C” Frame 7000L-UM300I-EN-P – June 2013
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 by pulling
the Gate and Cathode Leads. These connections
are sensitive and the device orientation should
only be adjusted by turning the device itself.
I M P O R T A N T I M P O R T A N T 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. Remove 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 a 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.