Rockwell Automation Publication 7000-UM202D-EN-P - May 2018 99
Power Component Definition and Maintenance Chapter 2
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 87
).
2. Remove the load from the clamp head as described in Checking
Clamping Pressure on page 93.
3. Completely remove SGCT from the heatpipe that is being replaced as
described in Replacing the SGCT
on page 73.
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 87
).
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)
12. Replace front white heatpipe retaining bracket.
13. Replace top heatsink horizontal fin support.
14. Replace the snubber resistor wire lugged connection and thermistor
connection, if present.
15. Replace the SGCT as described in Replacing the SGCT
on page 73.
16. Re-apply clamp force to heatpipes:
a. Apply a thin layer of electrical joint compound (Alcoa EJC No.2 or
approved equivalent) to the clamp head pressure pad face.
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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