Rockwell Automation 2361 Armature Heatsink Assembly (R, S-Frames) - Manual (Page 3)

Armature Heatsink Assembly Replacement (for 1250 and 1650A, 1395 DC Drives) 3
Publication 2361-5.17 - May 1998
Preliminary Steps Before replacing the heatsink assembly, shut off the drive power, wait
five minutes for the voltage to discharge, open the bridge bay door,
and remove all Lexan™ guards shielding the heatsink assemblies.
Notes on the Heatsink Assembly While this document covers the removal and installation of all 1250
and 1650A drive heatsink assemblies, please note that the assemblies
can be slightly different:
• Lower assemblies (on the negative leg) do not have thermoswitch
connections and are built in an upside-down fashion from the
upper assemblies.
• Non-regenerative assemblies only have the lower AC heatsink,
one armature-pulse transformer board, and one SCR installed.
• Regenerative assemblies will have two AC heatsinks, two
armature-pulse transformer boards, and two SCRs installed.