Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Navigation
Guide That Contains This Content
[+] Expand All
[-] Collapse All

    Troubleshooting the MX2020 Router Power Subsystem

    Problem

    Description: The following alarms, LEDs, and other conditions indicate a problem with the AC or DC power system:

    • If all AC or DC power supply modules (PSMs) have failed, the system temperature might have exceeded the threshold, causing the system to shut down.
    • The yellow PWR OK LED blinks when an AC PSM or DC PSM is out of power limit or in an overcurrent condition.
    • The red FAULT LED lights when the PSM is not receiving enough airflow to maintain proper temperature.
    • The red FAULT LED lights when the AC or DC output voltages are not within range.
    • The yellow INP0 LED blinks when the AC or DC voltage is present, but out of limits. This LED will blink continuously for approximately a few seconds on and a few seconds off.
    • The yellow INP1 LED blinks when the AC or DC voltage is present, but out of limits. This LED will blink continuously for approximately a few seconds on and a few seconds off.
    • The red -48V LED lights when the wrong polarity of DC input voltage is connected on the DC power distribution modules (PDM).

    Solution

    To troubleshoot the MX2020 power subsystem:

    1. Check the LEDs on all AC or DC PSM faceplate.
      • PWR OK PSM LED is blinking—Check the fans and air filters to be sure they are functioning and providing sufficient airflow through the chassis.
      • PWR OK PSM LED is off and no red alarm condition exists—Check that the circuit breakers are switched to the on position. Check that the AC or DC power switch is in the on (|) position.
      • PWR OK LED on PSMs is not lit—Check the PSMs are inserted and if the are operating.
      • If an AC PSM or a DC PSM is correctly installed and functioning normally, the PWR OK, INP0, and INP1 LEDs light steadily, and the FAULT LED is not lit.
    2. Check the LEDs on each DC PDM faceplate.
      • –48V PDM LED is off—Check that the PDM is receiving voltage.
      • –48V PDM LED is lit red—Check that the PDM is connected to correct input voltage and polarity.
      • Check that the DC PDM switch is set to 60 A or 80 A depending on current feed coming from the DC source circuit breaker.
      • –48V LED on a DC PDM is not lit—Check that the input is receiving source DC power.
      • If a DC PDM is correctly installed and functioning normally, the –48V source input LEDs light green steadily.
    3. Check the LEDs on the AC PDM faceplate. There is one LED for each input feed. See Mapping Input Power from AC Power Distribution Modules to AC Power Supply Modules on MX2000 Routers.
      • On the three-phase delta AC PDM, the left arrow () green LED is lit steadily, indicating that the left input feed is receiving voltage.
      • On the three-phase delta AC PDM, the right arrow () green LED is lit steadily, indicating that the right input feed is receiving voltage.
      • On the three-phase wye AC PDM, the left arrow () green LED is lit steadily, indicating that the left input feed is receiving voltage.
      • On the three-phase wye AC PDM, the right arrow () green LED is lit steadily, indicating that the right input feed is receiving voltage.
      • On the single-phase PDM, the green LED is lit steadily, indicating that AC voltage is applied to the input feed.
    4. Verify that the source circuit breaker has the proper current rating. Each PDM must be connected to a separate source circuit breaker. Check that the AC or DC circuit breaker is in the on (ON) position.
    5. Verify that the DC power cables or AC power cord from the power source to the router are not damaged. If the insulation is cracked or broken, immediately replace the DC power cable or AC power cord.
    6. Connect the PDM to a different power source with new power cables. If the PSM PWR OK LED still does not light, the PSM is the source of the problem. Replace the PSM with a spare.

      If the PWR OK LED on the installed spare does not light—the replaced PSM might be faulty. To return it for replacement, see Contacting Customer Support.

    7. Check the status of a PSM by issuing the following CLI command. The value Online in the rows labeled State indicates that each of the PSMs is functioning normally.

      The following output displays the AC PSM input status:

      user@host> show chassis environment psm
      PSM 0 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         223.75      1.40      313.25
                                   INP1         0.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      4.25       221.00     10.52
        Hours Used                 6862
      PSM 1 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      1.40      315.00
                                   INP1         2.50        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      4.25       221.00     10.52
        Hours Used                 6862
      PSM 2 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      1.30      292.50
                                   INP1         3.75        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      4.25       221.00     10.52
        Hours Used                 6862
      PSM 3 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         223.75      1.50      335.62
                                   INP1         3.75        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      5.00       260.00     12.38
        Hours Used                 6861
      PSM 4 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      1.30      292.50
                                   INP1         0.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.75      4.50       232.88     11.09
        Hours Used                 7438
      PSM 5 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      1.30      292.50
                                   INP1         5.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.75      4.00       207.00     9.86
        Hours Used                 7462
      PSM 6 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         222.50      1.50      333.75
                                   INP1         3.75        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      5.00       260.00     12.38
        Hours Used                 7462
      PSM 7 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      1.20      270.00
                                   INP1         3.75        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      3.75       195.00     9.29
        Hours Used                 7462
      PSM 8 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      1.40      315.00
                                   INP1         3.75        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      4.00       208.00     9.90
        Hours Used                 7462
      PSM 9 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         223.75      2.40      537.00
                                   INP1         5.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      8.75       455.00     21.67
        Hours Used                 6862
      PSM 10 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      2.20      495.00
                                   INP1         3.75        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      8.50       442.00     21.05
        Hours Used                 6862
      PSM 11 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      2.10      472.50
                                   INP1         0.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      8.25       429.00     20.43
        Hours Used                 7438
      PSM 12 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         223.75      2.20      492.25
                                   INP1         0.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      8.25       429.00     20.43
        Hours Used                 6838
      PSM 13 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      2.30      517.50
                                   INP1         0.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      8.50       442.00     21.05
        Hours Used                 7438
      PSM 14 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      2.20      495.00
                                   INP1         0.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.75      8.00       414.00     19.71
        Hours Used                 7462
      PSM 15 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         223.75      2.20      492.25
                                   INP1         0.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      8.00       416.00     19.81
        Hours Used                 6837
      PSM 16 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         226.25      2.20      497.75
                                   INP1         5.00        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     52.00      8.25       429.00     20.43
        Hours Used                 7462
      PSM 17 status:
        State                      Online
        Temperature                OK
        AC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         225.00      2.20      495.00
                                   INP1         3.75        0.00      0.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.75      8.25       426.94     20.33
        Hours Used                 7462
      

      The output displays the DC PSM input status:

      user@host> show chassis environment psm
      PSM 4 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                   INP1         51.20       11.55     591.36
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      10.25      525.31     25.01
        Hours Used                 1369
      PSM 5 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                   INP1         50.80       11.55     586.74
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      10.50      538.12     25.62
        Hours Used                 1722
      PSM 6 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                   INP1         50.80       11.20     568.96
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      10.00      512.50     24.40
        Hours Used                 2969
      PSM 7 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                   INP1         51.60       11.20     577.92
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      10.00      512.50     24.40
        Hours Used                 2970
      PSM 8 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                   INP1         51.60       11.20     577.92
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      10.00      512.50     24.40
        Hours Used                 2970
      PSM 13 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                  INP1         52.00       10.50     546.00
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      9.50       486.88     23.18
        Hours Used                 810
      PSM 14 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                   INP1         50.80       10.50     533.40
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      9.50       486.88     23.18
        Hours Used                 1722
      PSM 15 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                   INP1         50.80       10.15     515.62
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      9.50       486.88     23.18
        Hours Used                 2970
      PSM 16 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                   INP1         51.60       10.15     523.74
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      9.25       474.06     22.57
        Hours Used                 2970
      PSM 17 status:
        State                      Online
        Temperature                OK
        DC Input                   Feed       Voltage(V)  Current(A) Power(W)
                                   INP0         0.00        0.00      0.00
                                   INP1         51.60       10.15     523.74
        DC Output                  Voltage(V) Current(A)  Power(W)   Load(%)
                                     51.25      9.25       474.06     22.57
        Hours Used                 2970
      
    8. If a red alarm condition occurs, issue the show chassis alarms command to determine the source of the problem.
    9. If all PSMs have failed, the system temperature might have exceeded the threshold, causing the system to shut down.

      Note: On the display and in the CLI, the PSMs are referred to as PSM0 through PSM8 (bottom) and PSM9 through PSM17 (top).

      If the system temperature exceeds the threshold, Junos OS shuts down all PSMs so that no status is displayed.

      Junos OS also can shut down one of the PSMs for other reasons. In this case, the remaining PSMs provide power to the router, and you can still view the system status through the CLI or display.

    10. If you cannot determine the cause of the problem or need additional assistance, see Contacting Customer Support.

    Modified: 2017-01-06