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UM582127000 User Instructions
Issue AC, January 2, 2013 Spec. No. 582127000 (Model 721NPBB)
Page 40 Chapter 4. Troubleshooting and Repair
This document is property of Emerson Network Power, Energy Systems, North America, Inc. and contains confidential and proprietary information owned by Emerson Network Power, Energy
Systems, North America, Inc. Any copying, use, or disclosure of it without the written permission of Emerson Network Power, Energy Systems, North America, Inc. is strictly prohibited.
SM-DU Circuit Card Replacement (Supplemental Bays 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 step is not followed.
3) Connect an approved grounding strap to your wrist. Attach the other end to a
suitable ground.
4) Remove the top and front panels to access the circuit cards at the bottom of the
distribution cabinet. See Figure 4-10.
5) Remove connectors J1, J2, and J3 from the circuit card.
6) Remove the screws securing the circuit card and remove the circuit card from the
distribution cabinet.
7) In this step, ensure you do not intermix the old and replacement circuit cards.
Set the switches 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).
8) Slide the replacement circuit card into the mounting position inside the
distribution cabinet, and secure with the screws removed from the old circuit
card.
9) Plug connectors J1, J2, and J3 into the circuit card.
10) Reinstall the top and front panels that cover the circuit cards at the bottom of the
distribution cabinet.
11) Remove the grounding wrist strap.
12) Close the distribution cabinet’s front door. Turn the latch clockwise to secure the
door.
13) Temporarily remove then re-insert the ACU+. Wait for the ACU+ to initialize.
14) Enable the external alarms, or notify appropriate personnel that this procedure is
finished.
15) Ensure that there are no local or remote alarms active on the system.