Honeywell ControlEdge 900 platform Hardware Planning And Installation Manual page 159

TIP: The power supply includes an internal fuse, rated at 5
amperes. This fuse is not replaceable in the field. The user must
provide an external fuse that has a current rating lower than
that of the internal fuse. See step Replacing the power supply
on page of the section Assemble Redundant Controller Rack,
Assembly.
CAUTION: For redundant power supply, Removal and Insertion
Under Power is supported. Remove the defective power supply
from the rack and insert a new one.
TO replace the power supply:
CAUTION: Explosion hazard. Removal and Insertion Under Power
is not supported in Division 2/ Zone 2
1. If the power supply to be replaced is powering a rack that is
currently controlling a running process, use one of the following
methods.
Ensure that powering down the rack will not have adverse
l
consequences on any running process.
Bring the process to a safe and orderly shutdown.
l
2. Using an external, user-supplied switch, disconnect the power
supply from source main power. Use a meter to ensure that power
is off.
3. Depending on the type of wire lugs used, loosen or remove the
three screws on the terminal board, and remove the three wires
from the terminal board.
ATTENTION: DO NOT remove the nut that secures the lug
for the PE Ground wire (green) to the grounding stake at
the bottom of the rack.
4. At the top and bottom of the module, loosen the captured screws
that secure the module in the rack, and remove the power supply
from the rack.
5. Place the new power supply in the rack.
6. Secure the lugs for AC or DC wiring to the terminals on the new
power supply:
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