Rockwell Automation 2364,2364E NRU DIODE REPLACEMENT - Manual (Page 3)

NRU Diode Replacement 3
Publication 2364E-5.11 - April 1998
Removing the Diode This section contains the procedure for removing a diode.
1. Remove the Lexan™ guard covering the circuit breaker and fuses
in the left bay.
2. Remove the Lexan guard covering the diode bridge assembly in
the right bay.
3. Remove the 4 bolts that hold the horizontal AC busbar to the fuse
busbar in the left bay.
4. While supporting the busbar, remove the nuts – that hold the hor-
izontal AC busbar to the heatsinks in the right bay – from right to
left.
Note: Removing the nuts/bolts in the right bay from right to left
helps balance the busbar when removing the last bolt.
5. Remove the busbar.
6.
7. Note the position of the force gage and force number on the edge
of the diode clamp bar of the diode to be changed.
8. Remove the diode clamp nuts of the diode to be changed, while
holding and preventing the heatsink from falling forward.
9. Remove the AC heatsink.
Important: Be careful when servicing the 1500A DC and 2000A
DC NRUs so that the diode does not fall out. Once the
diode is unclamped, the only thing that holds the diode
to the heatsink is the silicone oil.
If your NRU is rated at: Then:
2500A DC or 3000A DC Remove the piece of Lexan that covers the
heatsinks.