Ac Power Supply Load Sharing And Fault Tolerance; T640 Three-Phase Delta And Wye Ac Power Supply Leds; Figure 46: Three-Phase Wye Ac Power Supply Connections; Figure 47: Wye Three-Phase Ac Power Cord - Juniper T640 Hardware Manual

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AC Power Supply Load Sharing and Fault Tolerance

Documentation

Figure 47 on page 109

shows the three-phase wye AC power cord.

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.

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

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.

Chapter 7: Power System Components and Descriptions

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