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danger:
No commercially AC powered equipment may be used or placed within 7 ft. of –48V
equipment. This may create a shock or current loop that can be severely hazardous
to personnel and equipment.
warning:
Do not carry exposed metal keys or tools in pockets or on belts when working on or
around electronic equipment. Do not wear metal rings, watches, or jewelry on wrists
or hands when working on any electronic equipment or other related electrostatic
sensitive components. Always wear a wrist strap or other electrostatic protection
when handling printed circuit cards and other electrostatic sensitive devices.
warning:
Before beginning any of the following procedures, ensure that all breakers that
provide power to the system are open.
warning:
Before performing the following procedures do the following:
•
Ensure that no power is being provided to the system from the –48VDC power
source, such as a power board
•
Ensure that no circuit cards are installed in the shelves
•
Remove all fuses from the fuse and alarm panels
•
Recheck wiring and connections for proper polarity
Caution:
All personnel associated with the installation of this system must adhere to all safety
precautions and use required protection equipment, to avoid the possibility of injury
to personnel, service degradation, and/or service interruption.
Caution:
This is a redundant system, to allow service during normal maintenance. When
repairs require a total power disconnect, both input supply sources must be
disconnected. This will cause service interruption and takes down the system.
Chapter 6
–48VDC Power Source
6-109
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