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What are the Power Quality settings for an SMT or SMX Smart-UPS?


Issue:

What are the Power Quality settings for an SMT or SMX Smart-UPS?

Product Line:

Smart-UPS

Environment:

All SMT and SMX models - All Serial Numbers

Cause:

SMT and SMX series Smart-UPS feature a wizard that allows you to configure a "Power Quality" setting during initial set up via the Set Up wizard on the LCD screen.

Resolution:

During initial setup you are prompted to select your "Power Quality". Power Quality is a combination of High and Low voltage Transfer points along with Sensitivity.

Transfer Points are the High and Low voltage points where the UPS will enable Automatic Voltage Regulation.
If the UPS is unable to regulate voltage within this window, it will then switch to battery.

Sensitivity relates to Total Harmonic Distortion, Frequency drift and Dv/Dt (rapid change of voltage) 

Once you select a Power Quality setting you can always change it later via the LCD or a Network Management Card interface. If you want to change the Sensitivity or Transfer Points individually via the LCD interface you would first need to enable "Advanced Menus" via the Configuration menu. 

Depending on your particular model and firmware revision your specific parameters may vary. 

As an example, on an SMT750C with firmware UPS 03.5 your Power Quality Settings would be as Follows:

GOOD: 
Sensitivity - Normal
Low Voltage Transfer Point: 106V
High Voltage Transfer Point: 127V
(NOTE: These are the tightest parameters supported by this UPS. This is the UPS Default.)

FAIR:
Sensitivity - Reduced
Low Voltage Transfer Point: 103V
High Voltage Transfer Point: 130V

POOR:
Sensitivity - Low
Low Voltage Transfer Point: 97V
High Voltage Transfer Point: 136V
(NOTE: These are the widest parameters supported by this UPS.)

 
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