Rockwell Automation 20B Power Components Repl. Instructions - Frame 5 - Manual (Page 4)

4
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SCR and Brake IGBT Removal/Replacement
a. Remove upper sheet metal enclosure by taking out the
appropriate screws.
b. Locate the components to be replaced.
SCR Replacement
c. Disconnect the Gate Leads and the R, S or T cable of
the SCR to be replaced.
d. Remove the Bus Bars and Snubber Board. Remove the
SCR.
e. Thoroughly clean the SCR mounting surface. Apply a
thin coating of the supplied thermal grease to the new
SCR. Install with the supplied screws and tighten to
3.3
±0.3 N-m (29 ±3.0 lbf.-in.).
f. Replace the Gate Leads and verify correct lead
placement. Note: Placement is the same for all SCR’s.
g. Replace the R, S or T lead. Tighten screws to 3.3
±0.3
N-m (29
±3.0 lbf.-in.).
h. Replace Bus Bars and tighten screws to 3.3
±0.3 N-m
(29
±3.0 lbf.-in.).
Tighten Snubber Board screws to 1.7
±0.1 N-m (15
±1.0 lbf.-in.).
i. If Brake IGBT replacement is necessary, proceed to
step j . Otherwise, re-assemble drive. Tighten sheet
metal screws to 3.2 N-m (28 lbf.-in.).
Brake IGBT Replacement
j. Locate Brake IGBT (see photo). Note cable
placement. Remove Bus Bars and disconnect cables.
k. Remove the IGBT by taking out the two screws.
l. Thoroughly clean the IGBT mounting surface. Apply a
thin coating of the supplied thermal grease to the new
IGBT. Secure with the supplied screws and tighten to
4.5
±0.5 N-m (40 ±4.0 lbf.-in.).
m. Re-assemble in reverse order. Tighten Bus Bar screws
to 3.3
±0.3 N-m (29 ±3.0 lbf.-in.) and sheet metal
screws to 3.2 N-m (28 lbf.-in.).
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SCR Bus Bars
Snubber
Board
Brake IGBT
(Not on All drives)
Gate
Leads
SCRs
R
S
T
Lead Assembly “X3”
“T” Lead from “X3”
Lead Assembly “T” Lead from “X2”
Lead Assembly
Lead Assembly “X2”
Publication RA-IN019B-EN-P – October, 2006 P/N 390247-P02
Supersedes RA-IN019A-EN-P January, 2006 Copyright © 2006 Rockwell Automation, Inc. All rights reserved. Printed in USA.
U.S. Allen-Bradley Drives Technical Support - Tel: (1) 262.512.8176, Fax: (1) 262.512.2222, Email: [email protected], Online: www.ab.com/support/abdrives