Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control User Manual
Page 87
Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
87
Component Definition and Maintenance
Chapter 3
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 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. 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.
12.
While grounded, use a long Phillips screwdriver to remove the two screws
that hold the SCR SPGDB to the metal bracket on the red glastic
assembly. Retain the hardware.
13.
Pull the 4 plastic clips that secure the SCR SPGDB to the glastic assembly.
Retain the hardware.
14.
Install the new SCR SPGDB in the assembly with the 4 plastic clips and
use the screws to secure the board to the metal bracket.
15.
Clean the heat sink with a soft cloth and rubbing alcohol.
16.
Slide the SCR and SPGDB back into place until the mounting bracket
makes contact with the heat sink. Use the Phillips screwdriver to tighten
the assembly to the heat sink.
17.
Reapply the clamping load as described in
18.
Connect the control power cable and the fiber optic cables, ensuring that
you do not exceed the bend radius.
IMPORTANT
Too much joint compound may result in contamination of other surfaces
leading to system damage.