Juniper PTX5000 Hardware Manual page 73

Copyright © 2017, Juniper Networks, Inc.
NOTE: There are no mechanical fuses in the PDU to be replaced. For output
voltage, current protection is provided by electronic fuses, hot-swap circuits,
or ORing circuit. Electronic fuses and hot-swap circuits also provide current
limitation.
NOTE: The PDUs contain no fans, but are cooled by the fans in the power
supply modules.
High Capacity DC PDU Description
The High Capacity DC PDU (60-A) provides 30.4 kW power output and you can connect
a maximum of eight High Capacity PSMs to the PDU. Each DC PDU can receive up to
sixteen 60-A DC input feeds from source outputs and provides two isolated outputs, a
12 V output at 2034 A maximum and a 36-V output at 167 A maximum. The 36-V output
provides power to the vertical and horizontal fan trays and the 12-V output provides
power to the system boards such as FPCs, SIBs, Routing Engines, and Control Boards
(CBs). Additionally, the PSMs provide 5-V bias output to the PDUs. Each DC PDU can
receive up to sixteen 60-A DC input feeds and weighs 64.5 lb (29.3 kg).
NOTE: You cannot mix existing PDUs with the High Capacity DC PDU.
The following is a list of some of the features of the High Capacity DC PDU :
Supports up to eight PSMs, each PSM requires two 60-A feeds.
Operates from 40 VDC through 72 VDC.
I2C bus protocol fault reporting and control.
Front-to-back airflow direction.
Single output enable or disable switch to switch on or switch off the output of the PDU,
which enables or disables the outputs from all the PSMs in the PDU.
Reverse polarity protection—The PDU or PSMs are not damaged even if the input
voltage is reversed for an indefinite period of time.
Hot-pluggable and hot-removable.
No power zoning for PSMs.
NOTE:
High Capacity DC PDU Components
NOTE: The High Capacity 60-A DC PDUs do not have circuit breakers.
Chapter 4: Power System Components and Descriptions
37