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User Instructions UM582127000
Spec. No. 582127000 (Model 721NPBB) Issue AC, January 2, 2013
Chapter 4. Troubleshooting and Repair Page 51
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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.
Optional Manual Battery Disconnect Circuit Card Replacement
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.
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 4-16.
6) Unplug all connectors plugged into the circuit card.
7) Remove the screws securing the circuit card and remove the circuit card from the
distribution cabinet.
8) Place 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 all connectors removed from the old circuit card into the same position on
the replacement circuit card.
10) Remove the grounding wrist strap.
11) Reinstall the top and front panels that cover the circuit cards at the bottom of the
distribution cabinet.
12) Close the distribution cabinet’s front door. Turn the latch clockwise to secure the
door.
13) Enable the external alarms, or notify appropriate personnel that this procedure is
finished.
14) Ensure that there are no local or remote alarms active on the system.