User's Manual

Section 5877 User Instructions
Issue AQ, January 15, 2013 Spec. No. 582140000 (Models 802NLDB, 802NLEB and 802NL-B)
Page 6-18 Chapter 6. System Troubleshooting and Repair
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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.
Distribution Bus Monitoring Circuit Card Replacement
Two Distribution Bus Monitoring circuit cards are installed in each Power/Distribution Bay.
Four Distribution Bus Monitoring circuit cards are installed in each Distribution Only Bay.
Note: Refer to Figure 6-4 and Figure 6-5 as this procedure is performed.
Procedure
1) Observe the admonishments presented at the beginning of this chapter, and
those encountered in this procedure.
2) 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.
3) Open the bay's front door to access the Distribution Bus Monitoring circuit card
mounting positions.
Warning: Damage to the Distribution Bus Monitoring circuit card may result if
the next step is not followed.
4) Connect an approved grounding strap to your wrist. Attach the other end to a
suitable ground.
5) Remove the fuse that supplies input power to the Distribution Bus Monitoring
circuit card. Refer to Figure 6-7 and Figure 6-8 for location.
6) Open the hinged panel to access to Distribution Bus Monitoring circuit card.
7) Remove the circuit card.
8) Slide the replacement circuit card into its mounting location, ensuring the rear
edge connector is firmly seated.
9) Close the hinged panel.
10) Replace the fuse which supplies input power to the Distribution Bus Monitoring
circuit card. Refer to Figure 6-7 and Figure 6-8 for location.
11) Remove the grounding wrist strap.
12) Close the bay's front 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.