Promise Vess A2600 Product Manual page 46

Vess A2000 Series NVR Storage Appliance
The Vess A2600 and Vess A2200 feature three N+1 power supplies. In this arrangement, one PSU is redundant,
so a minimum of two PSUs are needed to power up the enclosure.
Vess A-2600 N+1 power connections
Each PSU has a Status LED. After boot up, check the LEDs on each power supply on the back of the device.
These LEDs will light green to indicate normal operation. A red LED indicates a problem or unit failure.
Important
There are three LED indicators on the N+1 power supplies. Check
these after powering the devices on to make sure the cooling and
power status for the power module is normal.
Vess A2600 N+1 PSUs
PSU1, PSU2 and PSU3
Vess A2200 N+1 PSUs
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PSU status LEDs