Replacing A T640 Dc Power Supply Cable; Figure 142: Installing A Four-Input 240-A Dc Power Supply - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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Replacing a T640 DC Power Supply Cable

260
Verify that the LEDs on the power supply faceplate are lit steadily, indicating
19. CB ON
that the circuit breakers are on.
Verify that the DC OK LED on the power supply faceplate is lit steadily, indicating that
20.
the power supply is correctly installed and is functioning properly. The
blinks momentarily, then lights steadily.

Figure 142: Installing a Four-Input 240-A DC Power Supply

T640 Power System Description on page 49
T640 Four-Input 240-A DC Power Supply Overview on page 55
T640 Four-Input 240-A DC Power Supply LEDs on page 56
Troubleshooting the T640 Power System on page 171
T640 DC Power Supply Electrical Specifications on page 348
Site Electrical Wiring Guidelines for M Series and T Series Routers on page 346
You can use this procedure to replace a DC power cable for a two-input 160-A power
suply, three-input 240-A DC power supply, or a four-input 240-A DC power supply.
The router has either one nonredundant power supply or two redundant, load-sharing
power supplies. Each DC power cable on a redundant power supply is hot-insertable and
hot-removable. When a redundant power supply is powered down, the other power
supply automatically assumes the entire electrical load for the router. If you have only
one power supply, you must power off the system before removing a DC power cable.
1. Removing a T640 DC Power Supply Cable on page 261
Installing a T640 DC Power Supply Cable on page 263
2.
LED
DC OK
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