Table 61: Six-Input DC Power Supply LEDs
DescriptionStateColorLED
Input is receiving voltage.On steadilyGreenINPUT
PRESENT—One
per input
Input voltage is not present.Off
When all inputs are properly
energized, the DC OK LED indicates
that the power supply is functioning
normally.
On steadilyBlueDC OK—One per
power supply
Either the power supply is starting
up, or it is not functioning, not
properly installed, or not operating
properly.
Blinking
Power supply has exceeded
recommended temperature.
On steadilyYellowOVER
TEMP—One per
power supply
Power supply is within the
recommended temperature or the
power supply is not on.
Off
Related
Documentation
T640 Six-Input DC Power Supply Description on page 104•
• Maintaining the T640 Power Supplies on page 456
• T640 LED Overview on page 464
• Troubleshooting the T640 Power System on page 476
• Replacing a T640 Six-Input DC Power Supply on page 380
T640 Three-Phase Delta and Wye AC Power Supply Description
•
Three-Phase Delta AC Power Supply on page 106
•
Three-Phase Wye AC Power Supply on page 108
•
AC Power Supply Load Sharing and Fault Tolerance on page 109
Three-Phase Delta AC Power Supply
Each three-phase delta AC power supply weighs approximately 31.0 lb (14.06 kg). A
metal wiring compartment contains the AC terminal block and ground labeled GND. The
AC terminal block consists of three input terminals labeled L1, L2, and L3, from left to
right. The power switch provides power to the router. Each power supply’s cooling system
consists of two fans, a front air filter, and a side air filter. LEDs provide the status of the
power supply. Figure 42 on page 107 shows the three-phase delta AC power supply.
Copyright © 2017, Juniper Networks, Inc.106
T640 Core Router Hardware Guide
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