c) Remove the 2-hole lugs from each of the terminals.
Step 5
From the front of the chassis, use a Phillips #2 screwdriver to loosen the four screws securing the failed PFU to the
chassis.
Step 6
Grasp the handle on the front of the PFU and pull forcefully downward to extract the PFU from the power plane connectors.
Pull the unit from the chassis and set it aside.
Step 7
Verify that the four circuit breakers on the front of the replacement PFU are in the OFF (O) position. the handle on the
front of the PFU should be in the down position.
Step 8
Slide the replacement PFU into the PFU bay until it is flush against the rear connectors. Firmly push the PFU into the
power plane connectors. Pull the handle forcefully upwards to fully seat the PFU into the power plane connectors.
Step 9
Use a Phillips #2 screwdriver to tighten each of the four screws on the PFU to secure it to the chassis.
Step 10
At the rear of the chassis replace the power feed cables on the PFU input terminals.
a) Before proceeding, verify that the bottom nuts on all terminals are torqued to 50 in-lb. (5.65 N-m).
b) Thread each cable through an opening in the side of the chassis and route it to the appropriate terminals (-48V 1,
Return 1, -48V 2, Return 2, etc.).
c) Install each lug over the two terminals.
d) Secure each lug to the terminals with flat washers, lock washers and nuts. The nuts should be torqued to 8 in-lb. (0.9
N-m).
e) Continue installing the feeds on the terminals until all power feed connections have been completed to the replacement
PFU.
To avoid the risk of fire verify that the supply and return lugs are not touching.Caution
Step 11
Turn ON the four power feeds from the power distribution panel to the PFU.
Step 12
At the front of the chassis, power up the PFU by setting the four circuit breakers on its front panel to ON ( | ). The four
blue LEDs should be ON.
Step 13
Reinstall the plastic terminal cover on the top-rear of the chassis.
To avoid the risk of personal injury and/or potential damage to the system, never operate the chassis without
the plastic cover.
Caution
ASR 5500 Installation Guide
136
Replaceable Components
Replacing a PFU
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