Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 181
Troubleshooting Chapter 9
Figure 63 - 6900V SCR Replacement, 180/360A
Figure 64 - Removing and Replacing SCR 1, SCR 2 and SCR 5
Do not loosen
Do not loosen
Gap
Center Nut
Locking Nut (Do not adjust)
Indicating Washer
To remove clamp pressure:
Loosen lower center nut so that the gap
between the clamp surface and the
heatsink is approximately 6 mm (0.25 in.).
A 21-mm open end wrench is required.
To Remove SCR 1:
• Remove shorting bar hardware
• Pry Heatsinks 1 and 2 apart
• Extract SCR
To Insert New SCR:
• Apply thin film of electrical joint compound to
surfaces of SCR.
• Install SCR so that it is seated in locating pin of
heatsink (note orientation of SCR).
• Pry heatsinks to close gap, ensuring that SCR is
seated properly in both its locating pins.
• Rotate SCR so that all leads have same
direction.
Proceed to replacement of other SCRs in
the matched set (SCR 2 and SCR 5).
Note: You must replace all three SCRs of a
matched set.
Heatsink 6
SCR 2
SCR 1
Heatsink 2
Heatsink 3
Heatsink 1
Locating Pin
Locating Pins
Shoring Bar
Heatsink 5
Shoring Bar
SCR 5
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