Replacing an 8234-EMA, 9117-MMA, or 9406-MMA power supply with power on

Learn how to replace a power supply with the system power on.

Attention: Two power supplies must be present in the system to power on the system unit. If one power supply fails, or you have a system failure that does not stop the fans, the system will continue to operate. You can remove and replace the power supply with the system power on if it is done in less than five minutes. After five minutes, the system will power off to prevent the system from overheating. If the system power is off, go to Replacing an 8234-EMA, 9117-MMA, or 9406-MMA power supply with power off.

If your system is managed by the Hardware Management Console (HMC), you can use the HMC to complete the steps for replacing a power supply. For instructions, see Exchanging a part using the Hardware Management Console.

To replace a power supply in a system that is not managed by an HMC while the system power is on, complete the following steps:

  1. To remove the power supply, see Removing an 8234-EMA, 9117-MMA, or 9406-MMA power supply with power on.
  2. Complete the prerequisite tasks described in Before you begin.
  3. Attach the wrist strap.
    Attention:
    • Attach a wrist strap to an unpainted metal surface of your hardware to prevent electrostatic discharge (ESD) from damaging your hardware.
    • When using a wrist strap, follow all electrical safety procedures. A wrist strap is for static control. It does not increase or decrease your risk of receiving electric shock when using or working on electrical equipment.
    • If you do not have a wrist strap, just prior to removing the product from ESD packaging and installing or replacing hardware, touch an unpainted metal surface of the system for a minimum of 5 seconds.
  4. With the locking handle in the open position, place the new power supply in the power supply bay.
  5. Push the power supply (A) into place as shown in Figure 1.
    Figure 1. Replacing the power supply
    Close and lock power supply.
  6. Close the locking handle (B) until the locking tab (C) locks into the closed position.
  7. Reconnect the power cable to the back of the power supply by routing it through the ring, if provided. If your server is equipped with a retention ring, route the power cord through the ring before you plug it into the back of the server as shown in Figure 2.
    Figure 2. Cable routed through power supply ring
    Graphic of a cable routed through a power-supply ring.
  8. Note the state of the light-emitting diodes (LEDs) on the power supply. For more information, see Power supply LEDs. If the LEDs indicate the power supply is operating normally, that is both of the green LEDs are on solid (not blinking), continue to the next step. If not, remove the power supply from the system and repeat the procedure starting with step 4. If, after repeating the procedure, the power supply is not operating normally, contact your service provider.
  9. Close the back rack door.