Juniper MX2020 Hardware Manual page 229

Solution
Copyright © 2013, Juniper Networks, Inc.
To troubleshoot the MX2020 power subsystem:
Check the LEDs on all AC or DC PSM faceplate.
1.
PSM LED is blinking—Check the fans and air filters to be sure they are
PWR OK
functioning and providing sufficient airflow through the chassis.
PSM LED is off and no red alarm condition exists—Check that the circuit
PWR OK
breakers are switched to the
in the on | position.
LED on PSMs is not lit—Check the PSMs are inserted and if the are operating.
PWR OK
If a AC or DC PSM is correctly installed and functioning normally, the
and , LEDs light steadily, and the
INP1
Check the LEDs on each DC PDM faceplate.
2.
–48V PDM LED is off—Check that the PDM is receiving voltage.
PDM LED is lit red—Check that the PDM is connected to correct input voltage
–48V
and polarity.
Check that the DC PDM switch is set to
coming from the DC source circuit breaker.
LED on a DC PDM is not lit—Check that the input is receiving source DC power.
–48V
If a DC PDM is correctly installed and functioning normally, the
LEDs light green steadily.
Check the LEDs on each three-phase delta and wye AC PDM faceplate. There is one
3.
LED for each input feed. See
Distribution Modules to AC Power Supply Modules on the MX2020 Router" on page 120
and "Mapping Input Power from Three-Phase Wye AC Power Distribution Modules to
AC Power Supply Modules on the MX2020 Router" on page
On the three-phase delta AC PDM, the left arrow
that the left input feed is receiving voltage.
On the three-phase delta AC PDM, the right arrow
indicating that the right input feed is receiving voltage.
On the three-phase wye AC PDM, the left arrow
that the left input feed is receiving voltage.
On the three-phase wye AC PDM, the right arrow
that the right input feed is receiving voltage.
Verify that the source circuit breaker has the proper current rating. Each PDM must
4.
be connected to a separate source circuit breaker. Check that the AC or DC circuit
breaker is in the on (
ON
Verify that the DC power cables or AC power cord from the power source to the router
5.
are not damaged. If the insulation is cracked or broken, immediately replace the DC
power cable or AC power cord.
Chapter 12: Troubleshooting MX2020 Router Hardware Components
position. Check that the AC or DC power switch is
ON
LED is not lit.
FAULT
60 A or
"Mapping Input Power from Three-Phase Delta AC Power
) position.
PWR OK
80 A depending on current feed
–48V , source input
125.
green LED is lit steadily, indicating
green LED is lit steadily,
green LED is lit steadily, indicating
green LED is lit steadily, indicating
, INP0 ,
203