Troubleshooting the SRX5800 Services Gateway Power System

Problem

The power system is not functioning normally.

Solution

• Check the LEDs on each power supply faceplate.
  • If a standard-capacity AC power supply is correctly installed and functioning normally, the AC OK and DC OK LEDs light steadily, and the PS FAIL LED is not lit.
  • If a high-capacity AC power supply is correctly installed and functioning normally, the DC OK LED lights steadily and the PS FAIL LED is not lit. In addition, the AC-1 OK LED lights green steadily if the upper AC feed (on the chassis above the power supply) is connected and receiving power, and the AC-2 OK LED lights green steadily if the lower AC feed (on the power supply itself) is connected and receiving power.
  • If a DC power supply is correctly installed and functioning normally, the PWR OK, BREAKER ON, and INPUT OK LEDs light steadily.
• Issue the CLI show chassis environment pem command to check the status of installed power supplies. As shown in the sample output, the value Online in the rows labeled State indicates that each of the power supplies is functioning normally:
  user@host> show chassis environment pem

  PEM 0 status:
    State                      Online
    Temperature                OK
    AC Input:                  OK
    DC Output             Voltage   Current       Power    Load
                            50        6             300      17
  PEM 1 status:
    State                      Online
    Temperature                OK
    AC Input:                  OK
    DC Output             Voltage   Current       Power    Load
                            50        3             150      8

If a power supply is not functioning normally, perform the following steps to diagnose and correct the problem:

• If a red alarm condition occurs, issue the show chassis alarms command to determine the source of the problem.
• If all power supplies have failed, the system temperature might have exceeded the threshold, causing the system to shut down.

  Note: If the system temperature exceeds the threshold, the Junos OS shuts down all power supplies so that no status is displayed. The Junos OS also can shut down one of the power supplies for other reasons. In this case, the remaining power supplies provide power to the services gateway, and you can still view the system status through the CLI or display.

• Check that the power supplies are switched on:
  • If the services gateway is equipped with standard-capacity AC power supplies, verify that the AC switch on the chassis above each power supply is in the on (—) position.
  • If the services gateway is equipped with high-capacity AC power supplies, verify that the AC switch on the chassis above each power supply is in the on (—) position and that the AC switch at the top of each power supply is in the on (|) position.
  • If the services gateway is equipped with DC power supplies, verify that the DC circuit breaker on the power supply (|) is in the on position.
• Verify that the source circuit breaker has the proper current rating. Each power supply must be connected to a separate source circuit breaker.
• Verify that the AC power cords or DC power cables from the power sources to the services gateway are not damaged. If the insulation is cracked or broken, immediately replace the cord or cable.
• Connect the power supply to a different power source with a new power cord or power cables. If the power supply status LEDs indicate that the power supply is not operating normally, the power supply is the source of the problem. Replace the power supply with a spare.