HP Surestore Disk Array 12h and FC60 - Manual (Page 33)

Disk Enclosure Components 33
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Power supplies share the load reciprocally; that is, each supply automatically increases its
output to compensate for reduced output from the other. If one power supply fails, the
other delivers the entire load.
Internal circuitry triggers a fault when a power supply fan or other power supply part fails.
If a power supply failure occurs, the amber fault LED will go on. An alert should also be
generated by EMS Hardware Monitoring when a power supply failure occurs.