LEGRAND Raritan PX3TS, User Manual

Page: 129 / 911

Chapter 6: Using the PX3TS
109
Number Event
Power failure
Automatic power transfer
There are three types of power transfer mechanisms:
•
Automatic transfer
•
Automatic retransfer
•
Manual transfer
Tip: You can monitor the power quality of each inlet or the power transfer
status by observing the Inlet Power indicator lamps. See
Transfer Switch
Indicator Lamps (on page 114).
Automatic Transfer
Power is automatically transferred from the preferred inlet to the alternate
because:
•
The preferred inlet's power fails, or
•
The preferred inlet's power quality (voltage or frequency) enters the
critical level.
Power quality is indicated through the Power Quality indicator lamps. See
Power Quality Indicator Lamps (on page 116).
The table below indicates which inlet the PX3TS selects when the power quality
changes.
Inlet power quality
Active inlet
Preferred Alternate
Normal Normal
Warning
Critical
Preferred
Warning Warning
Critical
Preferred
Warning Normal Preferred
Critical Normal
Warning
Alternate
Critical Critical None