This behavior is expected for the LEDs for these PSUs. For these appliances, the PSUs implement cold redundancy (power saver). The LED for the PSU that is in the active state stays solid green and the LED for the redundant PSU blinks green. When cold redundancy is not supported on an appliance, both PSUs are always in the active state and the LEDs remain solid green. 

PSU model numbers that support cold redundancy (as of September 2015; more PSU models might support cold redundancy in the future):

• DPS-750QB
• DPS-750XB

To confirm the model number of the PSUs:

1. Shut down the MWG appliance.
2. Disconnect the power plugs.
3. Pull the PSUs out of the appliance chassis.
4. Check the Model number on the surface of the PSUs:
    
   • If both PSU model numbers support cold redundancy, cold redundancy is supported on the appliance.
   • If only one or neither of the PSU model numbers support cold redundancy, cold redundancy is not supported on the appliance.

NOTE: If you replace a defective older PSU with a newer model that supports cold redundancy, the LED specification might change, depending on the replacement model.

IMPORTANT: If you see one of the following issues, contact Technical Support because this issue might be a hardware defect case:

• The LED on the active PSU blinks green.
• One of the LEDs blinks green even though the hardware does not support cold redundancy.
• Both LEDs blink green.

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