Rockwell Automation 1560E SMC Flex Smart Motor Controller - Manual (Page 142)

9-24 Troubleshooting
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Do not loosen
Centre Nut
Locking Nut
(Do not adjust)
Indicating Washer
Do not loosen
Gap
To remove clamp pressure, loosen lower
centre nut so that the gap between the
clamp surface and the heatsink is
approximately 6 mm (0.25 inch).
A 21-mm open end wrench is required.
Do not loosen
Centre Nut
Locking Nut
(Do not adjust)
Indicating Washer
Do not loosen
Gap
To remove clamp pressure, loosen lower
centre nut so that the gap between the
clamp surface and the heatsink is
approximately 6 mm (0.25 inch).
A 21-mm open end wrench is required.
Figure 9.15 – 6900V SCR Replacement, 180/360 A
To Remove SCR1:
• 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 (SCR2 and SCR5).
Note: You must replace all three SCRs
of a matched set.
Heatsink 6
Heatsink 1
Locating Pins
SCR5
Locating Pin
Heatsink 5
Heatsink 2
SCR1
SCR2
Heatsink 3
Shorting Bars
Shorting Bar
To Remove SCR1:
• 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 (SCR2 and SCR5).
Note: You must replace all three SCRs
of a matched set.
Heatsink 6
Heatsink 1
Locating Pins
SCR5
Locating Pin
Heatsink 5
Heatsink 2
SCR1
SCR2
Heatsink 3
Shorting Bars
Shorting Bar
Figure 9.16 – Removing and Replacing SCR1, SCR2 and SCR5