Nortel Passport 15000, Hardware Installation And Maintenance, Page: 267 / 874

Chapter 17 Hardware procedures 267
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
Procedure steps
1 Ensure that all mid-trip circuit breakers on the front of the MFA150 system
are off, that is, fully down and OFF is visible. This includes the breakers
on the controller and each rectifier. See the figure “Front of an MFA150
power system of five ac rectifiers” (page 268).
2 Place a step ladder in front of the controller (top unit) so that you can
access its top.
3 Access the inside of the controller by unfastening the small Phillips
screws at the top edges of its cover. Remove the cover. Put the screws
and cover aside temporarily.
4 At the back of the controller, locate the cable pair entering on the left side.
Confirm that the inside collar nut for the pair’s conduit elbow is tight
against the back panel.
5 On the faceplate of the controller, confirm that all cabled circuit breakers
labelled CBn are rated 60 A.
6 Confirm that the red cable
• connects to the BIP stud labelled A1+
• is labelled the same as the BIP stud
• is screwed to circuit breaker CB1 and the connection is tight; see the
figure “Power cable connections at the rear of an MFA150 system of
ac rectifiers” (page 271)
7 Confirm that its mate black cable
• connects to the BIP stud labelled A1-
• is labelled the same as the BIP stud
• is screwed to the ground busbar and the connection is tight; see the
figure “Power cable connections at the ground busbar inside an
MFA150 controller” (page 272)
8 Correct any incorrect label or connection inside the controller.
9 Repeat step 4 to step 8 for each other cable pair moving from left to right
across the rear of the controller. The cables to the BIP must be grouped
together. While viewing the rear of the BIP and the front of the controller,
the cable pair mappings are identified in the table “Connection mapping
between the BIP and the MFA150 controller” (page 269).
10 Fasten the cover back on top of the controller.