Nortel DMS-100 Manual page 105

2-58 System level recovery procedures
Recovering from a dead system in a SuperNode switch
4
At the power room
5
At the PDC
6
7
8
9
10
11
12
297-8021-545 Standard 14.02 May 2001
If power
is not restored
When power is restored at the power plant for your office, notify power
maintenance personnel. The power maintenance personnel verify that an
acceptable power level is restored for each PDC. At the rear of each PDC,
measure the dc voltage across the A feed bus and the battery return plate.
Repeat for the B feed bus. The power is restored when the voltage on is -60
V dc.
Note: The system distributes power at a potential of -60 V dc. In extreme
conditions like a commercial power failure, the operating voltage can range
from -57.4 V dc to -67.7 V dc.
If power
is restored
is not restored
To restore power to the PDC, contact the personnel responsible for power
maintenance at your site for help.
When power returns to the PDC, return to this point.
Inspect the alarm-indicating fuses for the dual-plane combined core (DPCC)
and network cabinets.
If a fuse
has blown
has not blown
Replace the blown cartridge fuse in the back of the affected fuse holder.
Make sure that the amperage of the replacement cartridge fuse matches the
amperage marked on the PDC.
Remove the blown alarm-indicating fuse from the front of the fuse holder.
Reinsert the empty fuse holder into the PDC.
Obtain a replacement alarm-indicating fuse.
Insert the replacement fuse into the fuse holder.
Proceed as follows:
If
fuses continue to blow
fuse replacement is successful
(continued)
Do
step 5
Do
step 6
step 5
Do
step 7
step 14
Do
step 13
step 14