NetSure
™
-48V DC Power System
User Instructions, UM582127000 (Issue AD, January 20, 2014)
Spec. No: 582127000 Code: UM582127000
Model No: 721NPBB Issue AD, January 20, 2014
Circuit Card Replacement Procedures
Circuit cards used in this power system
contain static-sensitive devices. Read the Static
Warning at the front of this document before
performing any of the following procedures.
General
The following circuit card replacement procedures can be
performed with the system operating.
Refer to Figure 1 for circuit card locations.
When performing any step in these procedures
that requires removal or installation of hardware, use
caution to ensure no hardware is dropped and left inside
the cabinet; otherwise service interruption or
equipment damage may occur.
When performing any step in these procedures that requires
removal of existing hardware, retain all hardware for use in
subsequent steps.
System Interface 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.
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.
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 any wires connected to the customer
connection terminal block on the circuit card. These
wires must be connected to the same terminals on the
replacement circuit card. Refer to Figure 20.
6. 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 20.
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.
7. Remove the external wiring from the customer
connection terminal block. 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.
8. Unplug all connectors plugged into the circuit card.
9. Remove the screws securing the circuit card and remove
the circuit card from the distribution cabinet.
10. In this step, ensure you do not intermix the old and
replacement circuit cards. Set the shorting jumpers on
the replacement circuit card to match the locations on
the old circuit card. Jumper settings are documented in
the “Setting Jumpers and Switch Options” section of the
Power System Installation Instructions (IM582127000).
11. Slide the replacement circuit card into the mounting
position inside the distribution cabinet, and secure with
the screws removed from the old circuit card.
12. Plug all connectors removed from the old circuit card into
the same position on the replacement circuit card.
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.
13. 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 to ensure that it
cannot be pulled out of the terminal block. Repeat for
each wire to be reconnected.
14. Remove the grounding wrist strap.
15. Reinstall the top and front panels that cover the circuit
cards at the bottom of the distribution cabinet.
16. Close the distribution cabinet’s front door. Turn the latch
clockwise to secure the door.
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