Rockwell Automation Publication 7000-UM202H-EN-P - November 2023 93
Chapter 2 Power Component Definition and Maintenance
4. There are two bolts that secure the heatsink to the PowerCage module.
They are M8 bolts (13 mm socket required), and must be removed using
several extenders to get the socket wrench out past all the sensitive gate
driver boards.
5. Loosen the two bolts and carefully remove the heatsink from the
PowerCage module.
6. Install the new heatsink and hand-tighten the bolts.
7. Replace the SGCT or SCR (see Replacing the SGCT
on page 69 or
Replacing SCR and SCR Self-Powered Gate Driver Boards (SPGDB) on
page 85).
8. Follow procedure Uniform Clamping Pressure
on page 87 to ensure the
heatsinks are clamped to a uniform pressure.
Replacing Heatpipes
For the largest power ratings of AFE rectifiers, heatpipes are used. Heatpipes
weigh approximately 13 kg (28 lb). To replace a heatpipe:
1. Loosen heatpipe locking nuts on top of heatpipe horizontal fin support
(center nut at each sink).
On 6600V drives only: Loosen heatsink nylon shipping bolts on the
bottom of the white heatsink retaining bracket (Figure 85
).
2. Remove the load from the clamp head as described in Checking
Clamping Pressure on page 88.
3. Completely remove SGCT from the heatpipe that is being replaced as
described in Replacing the SGCT
on page 69.
4. Remove snubber resistor lugged connection at front of heatsink block
and the thermistor connection if present.
5. Remove top heatsink horizontal fin support.
6. Remove the front white heatpipe retaining bracket at bottom of heatsink
block.
7. Remove the top clamp glass rod (Figure 85
).
8. Pull heatsink forward, and lift up and out of PowerCage module. Do not
remove the bottom clamp head glass rod.
On both the ends and middle heatpipes there will be resistance pulling
the heatsink forward due to the pin in the socket power connection is
being disconnected as the heatpipe is being pulled forward.
9. Install the new heatpipe.
10. Install top clamp head glass rod.
11. Set bottom clamp head glass rod to:
• 4160V set to 657.26 mm (+0.5 mm, -0.0 mm)
• 6600V set to 909.66 mm (+0.5 mm, -0.0 mm)
ATTENTION: Do NOT remove the pivot plate from the PowerCage. The pivot
plate is located on the opposite end of the PowerCage from the clamp head.
If the pivot plate is removed from the PowerCage, it must be replaced in the
original orientation. See Figure 45
through Figure 50 for pivot plate location.
ATTENTION: If present, remove plastic film from the heatsink before
installation. Failure to remove the film will result in device failure.
ATTENTION: If present, remove plastic film from the heatsink before
installation. Failure to remove the film will result in device failure.
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