UM582127000 User Instructions
Issue AC, January 2, 2013 Spec. No. 582127000 (Model 721NPBB)
Page 42 Chapter 4. Troubleshooting and Repair
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IB2 (ACU+ Interface Board) and Optional EIB (ACU+
Extended Interface Board) Replacement (Main Bay Only)
Procedure
1) Performing this procedure may activate external alarms. Do one of the following.
If possible, disable these alarms. If these alarms cannot be easily disabled,
notify the appropriate personnel to disregard any future alarms associated with
this system while the procedure is being performed.
Danger: Performing the next steps exposes service personnel to battery
potential. Exercise extreme caution not to inadvertently contact or
have any tool inadvertently contact any energized electrical
termination.
2) Open the distribution cabinet’s front door by turning the latch in the
counterclockwise position.
Warning: Damage to the circuit card may result if the next st ep is not followed.
3) Connect an approved grounding strap to your wrist. Attach the other end to a
suitable ground.
4) Carefully label the wires connected to the customer connection terminal blocks
on the circuit card. These wires must be connected to the same terminals on the
replacement circuit card. Refer to Figure 4-11 or Figure 4-12.
5) Carefully label the connectors plugged into the circuit card. These connectors
must be plugged into the same connectors on the replacement circuit card.
Refer to Figure 4-11 or Figure 4-12.
Danger: In the next step, external wiring may be energized from an external
source. DO NOT allow bare wire ends to contact any grounded or
energized object.
6) Remove the external wiring from the customer connection terminal blocks. DO
NOT allow the bare wire end to contact any grounded or energized object.
Isolate the wire end with electrical tape. Repeat for each wire to be removed.
7) Unplug all connectors plugged into the circuit card.
8) Remove the circuit card by removing the bracket the circuit card is mounted to.
Remove the circuit card from the bracket.
9) In this step, ensure you do not intermix the old and replacement circuit cards.
Set the switch on the replacement circuit card to the same setting as the old
circuit card. Switch settings are documented in CHAPTER 3. SETTING
JUMPERS AND SWITCH OPTIONS of the Power System Installation
Instructions (IM582127000).
10) Secure the replacement circuit card to the bracket, and re-install the circuit card
and bracket into the distribution cabinet.
11) Plug all connectors removed from the old circuit card into the same position on
the replacement circuit card.
Danger: In the next step, external alarm wiring may be energized from an
external source. DO NOT allow bare wire ends to contact any
grounded or energized object.
12) Reconnect the external wiring to the correct terminals on the customer
connection terminal block. First remove the electrical tape that was applied to
the bare wire end in a previous step. DO NOT allow the bare wire end to contact
any grounded or energized object. After securing the wire, gently tug on the wire