Rockwell Automation 2364,2364E NRU DIODE REPLACEMENT - Manual (Page 7)

NRU Diode Replacement 7
Publication 2364E-5.11 - April 1998
5. Carefully install the AC heatsink over the diode clamp bolts and snug
it up to the diode pole face.
6. Replace the diode clamp nuts and washers and start them by hand to
secure the front heatsink.
Important: Verify that the diode clamp washers are installed correctly
with the flat side toward the nut and the rounded side toward
the clamp/heatsink.
7. Check that the back roll pin is properly positioned on the back heat-
sink and the front roll on the front heatsink, using a small mirror.
Note: A roll pin is properly positioned if it is centered on the diode
pole face and the heatsink is flat against the diode pole face.
8. Once the roll pins drop into place, tighten the diode clamp nuts by
hand until snug, while maintaining the position of the front heatsink.
9. Once the roll pins drop into place, tighten the diode clamp nuts by
hand until snug, while maintaining the position of the front heatsink.
10.
If: Then:
A small mirror is not
available or if the roll
pins are not properly
positioned 1. Grasp the front heatsink with both hands.
2. Attempt to slide the front heatsink up and down, left and right.
Note: If the roll pins are in place the AC heatsink will not
move with respect to the DC heatsink. If the roll pins are not
in place, the AC heatsink will tend to tip and slide in any
direction.
3. Move the AC heatsink around until the roll pins drop into place.
Important: Use only light force to avoid scratching the diode pole
face.
If your NRU output
current (A DC) is: Tighten the diode clamp nuts evenly, 1/4 turn at a
time until the diode clamp gauge reads:
180 / 350 400 lbs. per leaf of gauge
900 2 kilo-lb on gauge
1500 / 2000 5 kilo-lb on gauge
2500 / 3000 10 kilo-lb on gauge