Nortel Passport 15000, Hardware Installation And Maintenance, Page: 355 / 874

Chapter 17 Hardware procedures 355
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
2 Switch off the appropriate power source feeds to the BIP and put tape
over the fuses or breakers to indicate that off is deliberate as opposed to
tripped.
If your power source is a system of ac rectifiers, power down the system
according to that product’s instructions. When using an Astec MFA150
power system of ac rectifiers, power down the system according to the
Astec document 167-9021-102
Advanced Power Systems MFA150
Modular Front Access Power System Description, Operation and
Maintenance User Manual.
3 Across the horizontal strain-relief bar near the rear of the BIP, remove the
tie-wraps that fasten cables to the top and bottom sides of the bar. Let the
red cables hang loosely under the bar.
4 Locate a cable at the far right or left side of the rear of the BIP, whichever
is easiest to access.
5 At the rear of the BIP, loosen the clamp of the insulation boot by using a
medium Pozidriv bit that fits snugly. Loosen the clamp until you can pivot
it easily with your finger.
6 Unfasten the lug retaining nuts from the stud using a 11-mm (7/16-in.)
deep socket with a 20-cm (8-in.) extender. Put the nuts aside temporarily.
If the thread pitch of the studs is different, remember which nut matches
each stud.
7 Remove the 2 Belleville washers from the studs. A Belleville washer is a
dome-shaped spring washer. Put the washers aside temporarily.
8 Pull the lug straight off the studs.
9 Ensure that the power input cable is labeled with a plus (+) or minus (-) A
or B at the BIP end. If the label is or was on the tie-wrap, transfer its
information to the cable itself.
If there is no label, refer to the figure “Overhead power input cables for the
lower shelf connected to the BIP” (page 337).
If the cable is being replaced, transfer the connection information to the
replacement cable.
10 Let the cable hang freely away from the BIP.
11 Loosely fasten a Belleville washer and nut back onto each stud.
12 Put an insulation boot over each stud pair and lightly clamp it back on.
13 For each remaining power input cable at the rear of the BIP, repeat step 4
to step 12.