Related
Documentation
T640 Power System Description on page 95•
• Powering On a DC-Powered T640 Router on page 239
• Maintaining the T640 Power Supplies on page 456
• T640 LED Overview on page 464
T640 Three-Input 240-A DC Power Supply Description
•
Three-Input 240-A DC Power Supply on page 99
•
Three-Input 240-A DC Power Supply Inputs on page 99
•
Three-Input 240-A DC Power Supply Load Sharing and Fault Tolerance on page 100
Three-Input 240-A DC Power Supply
Each three-input 240-A DC power supply weighs approximately 25 lb (11.3 kg) and consists
of three inputs, three 80-A circuit breakers, a fan, and LEDs to monitor the status of the
power supply. Figure 37 on page 99 shows the three-input 240-A DC power supply in
2-INPUT mode.
Figure 37: Three-Input 240-A DC Power Supply
Three-Input 240-A DC Power Supply Inputs
The three-input 240-A DC power supply inputs are labeled INPUT 0, INPUT 1, and INPUT 2,
from top to bottom. Each input consists of –48 VDC and return, each with its own 80-A
circuit breaker. The input mode switch on the faceplate allows you to set the DC power
supply to either 2–INPUT or 3–INPUT mode. 2-INPUT mode is required for the T640 router
and TX Matrix router.
Table 55 on page 100 describes which components are powered by each input.
99Copyright © 2017, Juniper Networks, Inc.
Chapter 7: Power System Components and Descriptions
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