Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 340 / 874

340 Chapter 17 Hardware procedures
241-1501-240 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. Include the breakers on the
controller and each rectifier.
2 Access the inside of the controller by unfastening the small Phillips
screws at the top edges of its cover. Put the screws and cover aside
temporarily. See the figure “Power cable connections at the rear of an
MFA150 system of ac rectifiers” (page 342).
3 At the inside back of the controller, locate the larger knockout disks that
are nearest the 60 A circuit breakers labelled CB1 to CB4. If you are
powering a single Passport 15000 or 20000, remove the disks aligned
with CB1 and CB2. If you are powering a second node, for example,
another Passport or a Shasta 5000, also remove the disks aligned with
CB2 and CB3.
4 Through each hole where a knockout disk was, insert a conduit elbow
provided with the MFA150, and fasten it with a collar nut. See the figure
“Power cable connections at the breakers inside an MFA150 controller,
side view” (page 343). For more information, refer to the Astec document
167-9021-133 Advanced Power Systems MFA150 Modular Front Access
Power System Detailed Installation Guidelines and Procedures Manual.
5 Locate the power cable from the BIP that has the 2-wire pair labelled A1+
and A1- and insert it through the conduit elbow that is aligned with CB1.
Insert the cable far enough so that the red cable can easily connect with
the circuit breaker.
6 Using the large slotted screw, fasten the conduit elbow clamp onto the
cable so that there will be no strain on either cable connection inside the
controller.
7 Place the lug of the red cable onto the stud at CB1 and fasten the 11-mm
(7/16-in.) nut. Use the example shown in the figure “Power cable
connections at the breakers inside an MFA150 controller, side view”
(page 343).
CAUTION
Risk of equipment damage by reversed polarity
Use the plus (+) and minus (-) symbols on the cables from
rear of the breaker interface panel (BIP) to ensure that the
polarity of each A and B battery (-48/-60 V dc) and battery
return for the input power feeds is correct. When powering
up the BIP, reversed polarity will damage circuits inside it.