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AC-POWER
Issue 4 May 2002 10-3 555-233-123
AC-POWER
AC Power for AC-Powered Systems
NOTE:
For environment maintenance, PPN or EPN cabinet configuration aspects in
a high or critical reliabilty system are irrelevant.
The environment maintenance strategy to be used depends on both the cabinet
configuration and the type of powering. Also refer to the DC-POWER (DC Power)
for environment maintenance strategy.
The AC Power MO represents the AC power provided to the system from a wall
outlet. The AC power comes from the wall outlet, through the Power Distribution
Unit (PDU), if installed, and is then distributed to the various cabinets. The battery
charger monitors AC power via fuse F3 (see
Figure 10-1 on page 10-4 ). If no PDU
is installed, the power is supplied directly to each cabinet from each individual wall
outlets.
When the system loses power (for example, a power outage in the building), a
Major alarm is logged against AC Power and the system goes on battery backup,
which is known as Nominal Power Holdover (NPH). If power is restored before the
NPH time expires, the alarm is resolved. Each basic control cabinet has separate
batteries for NPH. The nominal power holdover provided is as follows:
■
The batteries power the system for 10 seconds in a PPN cabinet, for 15
seconds in an EPN cabinet, and for 10 minutes in the control carrier in a
Standard Reliability system.
■
The batteries also provide system power for 5 minutes in the control carrier
in High and Critical Reliability systems.
!
WARNING:
Before powering down a cabinet or carrier that contains EMBEDDED AUDIX
circuit packs (TN566), first power down the AUDIX unit to avoid damaging
the AUDIX software. Instructions for powering down this unit are in the
“EMBEDDED AUDIX System Power Procedures” in Chapter 5, “Routine
Maintenance Procedures”, on the circuit pack, and in EMBEDDED AUDIX
documentation.
MO Name (in
Alarm Log) Alarm Level Initial Command to Run
1
1 Where P is an appropriate port network number determined via the PORT field from the
Alarm or Error Log.
Full Name of
MO
AC-POWER WARNING test environment P AC Power