Nortel DMS-100 Manual page 136

Recovering from a dead system in a SuperNode SE switch
4
At the power room
5
At the PDC
6
7
8
9
10
return plate. Repeat for the B feed bus. Consider power restored when the
voltage is -48 V dc on feeds A and B.
Note: Power distribution occurs at a standard potential of -48 V dc. Under
varied conditions, like a commercial power failure, the operating voltage
can range from -43.75 V dc to -55.8 V dc.
If power
is restored
is not restored
When you receive information that power returned to the power plant for your
office, consult power maintenance personnel. Have power maintenance
personnel verify that acceptable power returned at 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. Consider power restored when the
voltage is -60 V dc on feeds A and B.
Note: Power distribution occurs at a standard potential of -60 V dc. Under
varied conditions, like a commercial power failure, operating voltage can
range from -57.4 V dc to -67.7 V dc.
If power
is restored
is not restored
For help to restore power to the PDC, contact the operating company
personnel responsible for power maintenance at your site.
When power returns to the PDC, return to this point.
Inspect the alarm-indicating fuses for the SuperNode combined core (SCC)
and network cabinets (if equipped).
If the fuses
are blown
are 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 on a label on the PDC.
Remove the blown alarm-indicating fuse from the front of the fuse holder.
Insert the fuse holder into the PDC. Make sure you remove the
alarm-indicating fuse from the fuse holder.
Obtain a replacement alarm-indicating fuse.
DMS-100 Family NA100 Recovery Procedures LET0015 and up
System level recovery procedures
Do
step 6
step 5
Do
step 6
step 5
Do
step 7
step 14
2-89
(continued)