Juniper BT8A78CH1, Обзор оборудования и руководство по установке

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NOTE: The other end of these two cables will be connected to the
plant power source. Place this end of the cables out of the way until
you are ready to connect them to the power source.
b. Repeat for the other DC PEMs.
6.
Reinstall the protective shields on the DC PEMs.
The shields should be oriented such that the instrument access holes are aligned with
the DC terminals.
7.
Follow the appropriate procedures in your plant to prepare and connect the other end
of the power cables to the DC power source.
8.
Power on the DC power distribution unit in your plant to power on the chassis.
9.
Perform a voltage checklist. You can check the voltage through the instrument access
holes in the protective shields on the DC PEMs.
With a portable multimeter, measure the voltage at each DC PEM as follows:
• - Minus Feed
: -42VDC to -60VDC as measured from the Feed to the Return.
• + Positive Return
: Within less than 2V of the frame or chassis ground.
You have successfully completed this procedure.
Connecting the AC Power Feeds to a BTI7814 AC PEM
If you order the BTI7814 chassis with the AC option, the chassis is shipped with the 2900W
(53.5V) AC Rectifier Modules installed. This topic describes how to connect power to
the BTI7814 2900W (53.5V) AC Rectifier Module.
To understand how the power is distributed throughout the chassis, refer to “BTI7814
Power Distribution Plan” on page 40 . For procedures to replace an AC PEM, refer to
“Replacing the BTI7814 AC PEM” on page 182 .
WARNING:
This equipment is intended to be installed and serviced by qualified
personnel. •
•
To avoid personal injury or damage to chassis components, ensure there
is no power going to the chassis.
• Make sure you are familiar with the site and safety guidelines described in
the BTI7800 Series Hardware Overview and Installation Guide.
97 Copyright © 2019, Juniper Networks, Inc.
Chapter 4: Installing the BTI7800 Series Chassis