NetSure
™
-48V DC Power System
User Instructions, UM582127000 (Issue AD, January 20, 2014)
Spec. No: 582127000
Code: UM582127000
Model No: 721
NPBB
Issue AD, January 20, 2014
[37]
SM-DU+ and Shunt Interface Assembly 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.
Carefully label the wires connected to the shunt input
terminal blocks on circuit card. These wires must be
connected to the same terminals on the replacement
circuit card. Refer to
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
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.
6.
Remove the external wiring from the shunt input
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 screw securing the SM-DU+ and Shunt
Interface Assembly to the bottom of the distribution
cabinet, and remove the assembly.
9.
SM-DU+: 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 settings as the old
circuit card. Switch settings are documented in the
“Setting Jumpers and Switch Options” section of the
Power System Installation Instructions (IM582127000).
10.
Slide the replacement SM-DU+ and Shunt Interface
Assembly into the mounting position inside the
distribution cabinet, and secure with the screw removed
from the old assembly.
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 shunt input terminal blocks. 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.
13.
Remove the grounding wrist strap.
14.
Close the distribution cabinet’s front door. Turn the latch
clockwise to secure the door.
15.
Enable the external alarms, or notify appropriate
personnel that this procedure is finished.
16.
Ensure that there are no local or remote alarms active on
the system.
Danger
Warning
Danger
Danger
