Rockwell Automation 2361 Armature SCR Replacement - Manual (Page 3)

Armature SCR Replacement (for 3000A 1395 Drives) 3
Preliminary Steps Before replacing the armature SCRs, shut off the drive power,
wait five minutes for the voltage to discharge, open the bridge
bay door, and remove the Lexan™ shielding.
Removing the Heatpipe Assembly 1. Using a voltmeter, test the voltage across the three phases,
then across the heatpipe assembly components (including the
SCRs).
2. Unplug the SCR leads from all the armature-pulse trans-
former boards. (For SD3100 drives, tag all the SCR leads
and disconnect them from the pulse-gate amplifier boards.)
3. Remove the armature-pulse transformer board panel by
releasing the black latches on the left and right sides of the
panel.
4. Disconnect the three thermal switches and remove the wiring
from the mounting clips.
5. Remove the two bolts which connect the assembly to the out-
put busbar.
6. Remove the two bolts which connect the center heatpipe to
the incoming AC busbar.
7. Remove the two bolts from the top of the assembly where the
Glastic™ shroud is mounted to the back plane.
8. Lift the assembly out from the drive.
!
ATTENTION: If there is any voltage present,
remove the source of the voltage and check for
voltages again before proceeding to the next step.
!
ATTENTION: The heatpipe assembly weighs
about 75 lbs. Take the proper precautions (adhere
to your company material handling procedures)
when removing the assembly to prevent personal
injury and damage to the equipment.