Ametek 420VA Manual page 17

• When AC power fails, the UPM warns you with an audible alarm.
The Test/Silence button is used to silence the alarm. When battery
power begins to run low, the audible alarm will automatically return
and beep at a faster rate.
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.
A01-00055 Rev G
17