Replacing Power Supply Units on MHO-200

About PSUs

Maestro Orchestrators are equipped with two replaceable Power Supply Units (PSUs). The PSUs in these systems can work in a redundant configuration. It is possible to remove one of the PSUs without the need to bring down the Orchestrator.

Important:

PSUs have directional air flows similar to the fan module. The fan module airflow must coincide with the airflow of all of the PSUs. If the PSU airflow direction is different from the fan module airflow direction, it affects the Orchestrator's internal temperature. See Airflow in MHO-200.

Removing a Power Supply Unit

Important:

  • Before you remove one of the PSUs, make sure that:

    1. The System Status LED is lit in steady green (see Power Status LED).

    2. The PSU Status LEDs on the PSU that you leave in the Orchestrator are lit in steady green.

    See LEDs on the Front Panel of MHO-200.

  • To ensure proper cooling, do not leave the PSU slots of a Maestro Orchestrator empty for more than five minutes.

To remove a PSU:

  1. Disconnect the power cord from the PSU.

  2. Grasp and hold the PSU handle with your hand.

  3. Push the latch release with your thumb.

  4. Pull out the PSU from the Orchestrator.

    As you pull out the PSU, its status LED turns off.

PSU pulled out:

Installing a Power Supply Unit

Important:

Do not insert a PSU with a power cord connected to it.

  1. Make sure the mating connector of the new PSU is free of any dirt and obstacles.

  2. Insert the PSU end into the opening.

  3. Slide in the PSU until you feel a slight resistance.

  4. Continue to press the PSU until it seats completely.

    The PSU latch snaps into place. This confirms the proper installation.

  5. Connect the power cord to the PSU connector.

  6. Insert the other end of the power cord into an outlet of the correct voltage.

  7. These LEDs must light up in the green color:

    1. The LED on the PSU.

    2. The PSU Status LED (see PSU Status LED).

    If either of these LEDs does not light up in the green color, repeat the whole procedure to remove the PSU and insert it again.