Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control User Manual
Page 297
Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014
297
Component Definition and Maintenance
Chapter 5
4.
Remove the load on the clamp head as described in
5.
Loosen the 2 captive screws with a long Phillips screwdriver until the
circuit board is free. It may be necessary to adjust the position of the chill
blocks to allow free movement of the SCR.
6.
Slide the SCR and SCR SPGD Board straight out.
7.
While grounded, unplug the Gate-Cathode phoenix connector from the
SCR SPGD Board.
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.
ATTENTION: The fiber optic cables can be damaged if struck or bent
sharply. The minimum bend radius is 50 mm (2 inches). The connector
has a locking feature that requires pinching the tab and gently pulling
straight out. The component on the printed circuit board should be held
to prevent damage.
ATTENTION: 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.
IMPORTANT
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.
IMPORTANT
TO REPLACE THE SCR, FOLLOW STEPS 8-11, and 16-18.
IMPORTANT
TO REPLACE THE SCR SPGD BOARD, FOLLOW STEPS 12-15, and 16-18.
IMPORTANT
T
Too much joint compound may result in contamination of other
surfaces leading to system damage.