Removing and replacing a power supply might cause the following results:
Once a power supply has been removed, you must replace the power supply within three minutes to prevent the enclosure from overheating. Overheating has the potential to shut down the storage unit.
Access to data is lost if both power supplies are faulty or missing. If the second power supply fails while the first power supply is not present in the enclosure, you will lose access to all data.
Review the additional help explanation.