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
[39]
Optional LVD Driver and LVD Driver Lite 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.
If any of the low voltage disconnect contactors is open
and it is desired to be closed, push the LVD Inhibit Switch
located on the circuit card installed in the main bay to the
UP position momentarily and then leave the switch in the
middle (OFF) position.
5.
Remove the top and front panels to access the circuit
cards at the bottom of the distribution cabinet.
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
7.
Unplug all connectors plugged into the circuit card.
8.
Remove the screws securing the circuit card and remove
the circuit card from the distribution cabinet.
9.
Slide the replacement circuit card into the mounting
position inside the distribution cabinet, and secure with
the screws removed from the old circuit card.
10.
Ensure that the LVD Inhibit Switch is in the middle (OFF)
position.
11.
Plug all connectors removed from the old circuit card into
the same position on the replacement circuit card.
12.
Push the LVD Inhibit Switch to the down (ON) position.
13.
Remove the grounding wrist strap.
14.
Reinstall the top and front panels that cover the circuit
cards at the bottom of the distribution cabinet.
15.
Close the distribution cabinet’s front door. Turn the latch
clockwise to secure the door.
16.
Enable the external alarms, or notify appropriate
personnel that this procedure is finished.
17.
Ensure that there are no local or remote alarms active on
the system.
Danger
Warning
