Figure 46: Three-Phase Wye AC Power Supply Connections
Figure 47 on page 109 shows the three-phase wye AC power cord.
Figure 47: Wye Three-Phase AC Power Cord
AC Power Supply Load Sharing and Fault Tolerance
When the router is operating normally and both power supplies are switched on, load
sharing between them occurs automatically. When one power supply fails or is turned
off, the other power supply immediately assumes the entire electrical load for the system.
A single power supply can provide full power for as long as the router is operational.
Related
Documentation
T640 Power System Description on page 95•
• T640 Three-Phase Delta and Wye AC Power Supply LEDs on page 109
• Troubleshooting the T640 Power System on page 476
• T640 AC Power Requirements on page 137
• T640 AC Power Cord Specifications on page 139
T640 Three-Phase Delta and Wye AC Power Supply LEDs
Figure 48 on page 110 shows the LEDs on each three-phase delta AC power supply
faceplate. The three-phase wye AC power supply has the same LEDs. The LEDs in
Table 62 on page 110 indicate the status of the power supply. In addition, a power supply
failure triggers the red alarm LED on the craft interface.
109Copyright © 2017, Juniper Networks, Inc.
Chapter 7: Power System Components and Descriptions
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