Figure 145: Mx480 High-Capacity Dc Power Supply Input Mode Switch - Juniper MX480 Hardware Manual

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Turn on power to where the AC line goes into the power distribution module (PDM)
4.
area.
Move the power switch on the power supply to the on (|) position.
5.
Verify that the LEDs on the power supply faceplate are properly lit.
6.
Issue the CLI
show chassis environment pem
7.
and the Temperature is
To restart a high-capacity DC power supply after a shut down due to an
over-temperature situation:
Switch off the circuit breaker(s) on the DC distribution panel to remove power to
1.
the chassis and power supplies.
Switch on the circuit breaker(s) on the distribution panel to power up the chassis
2.
and power supplies.
NOTE: The power switch on the power supplies is not part of the outer
or inner DC circuits and therefore does not need to be switched off when
restarting the chassis.
Each High Capacity AC or DC power supply accepts two AC or DC feeds in two unique
AC or DC receptacles. It is possible to operate with one feed, but there is a reduction in
the power supply output. The DIP switch must be set according to the number of AC or
DC feeds that are present for the power supply. Refer to

Figure 145: MX480 High-Capacity DC Power Supply Input Mode Switch.

Position – indicates that only one AC or DC feed is provided.
0
Position – indicates that two AC or DC feeds are provided.
1
command and verify the State is
OK .
Chapter 5: Troubleshooting Hardware
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Figure 145 on page 365.
365