Rockwell Automation 2364F RGU Isolation Board Replacement - Manual (Page 3)

Publication 2364F-5.13 June 1999
RGU™ Isolation Board Replacement 3
Preliminary Steps Before replacing the power supply, shut off the power; lockout/tagout the
unit; and wait five minutes for all voltage to discharge. Open the bay door
to the power structure.
Replacing the Isolation Board 1. Using a meter, test the voltage across the AC line, across the DC bus, and
across the terminals on the isolation board.
2. Put on the ESD wrist strap and attach it to the PE busbar (rear grounding
bar in the bottom of the unit).
3. Remove the Lexan™ guard (and its standoffs) from the isolation board.
4. Disconnect the ground connection from P1, the feedback connection
from J1, the ribbon cable from J2, and the current transducer connection
from J7 (as shown in Figure 1).
5. Disconnect the terminal blocks TB5 and TB6.
6. Turn the six mounting standoffs counterclockwise to loosen the board
and pull the board out.
7. Remove the burden resistors from each of the terminal blocks.
8. Place the isolation board in an anti-static bag.
!
ATTENTION: If there is any voltage present, remove the
source of the voltage. Check for voltages again before
proceeding to the next step.