Ametek ABCE702-11R Manual page 18

Load Monitor
The Load Monitor is a six-segment LED display that shows the current load
percentage. The first 5 LED's each indicate approximately 20% load, with the
6th red LED showing the UPM is overloaded.
Battery Charge Monitor
The Battery Charge Monitor is a five-segment LED display that shows the
charge capacity of the internal battery from zero to 100%. Each LED indicates
approximately 20% of full charge.
Site Wiring Fault Indicator – (120 VAC models only)
The "SF" symbol will be displayed on the front panel of the UPM if it is
connected to an improperly wired AC receptacle. This is to indicate a missing
safety ground wire or a reversal in phase and neutral wiring. If the "SF"
is displayed on the front panel you should contact a qualified electrician
immediately.
NOTE:
Do not operate the UPM if the Site Wiring Fault LED is illuminated.
When lit, the LED is indicating a wiring condition, which may represent
a hazard of fire or electrocution. In addition, improper wiring may create
reliability problems for both the UPM and the connected system. Never
use a 3-blade to 2-blade adapter (often called a "cheater") to power UPM.
These devices remove the safety ground connection to the UPM and will
cause the Site Wiring Fault LED to illuminate.
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A01-00104 Rev A