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ENGLISH
Appendix A: Adjusting Voltage Settings
When the unit is not sounding an alarm, you can use the Alarm/Program button shown below to
change the following:
• Nominal Voltage — The normal voltage the UPS is programmed to expect, and the nominal UPS
output voltage under line loss conditions.
• Buck — The input voltage at which the Fortress.TeleCom decreases voltage before providing
output because the input voltage is too high.
• Boost — The input voltage at which the Fortress.TeleCom increases voltage before providing
output because the input voltage is too low.
• Transfer to Inverter — The point at which the UPS switches to inverter (battery power), either
because AC input voltage is very low or because it is very high.
Note:
Make sure you want to change these values before you
start the procedure below. Once you press the button
shown for 10 seconds, the values will change to the
default values, and any previous changes you have
made will be lost. If you have a question, contact the
nearest Best Power office, or call Worldwide Service
at 1-800-356-5737 or 1-608-565-2100.
Do not change voltage settings when unit is operating on batteries. To change the values, follow these
steps:
1.
Press the button shown until LEDs on the front of the Fortress.TeleCom blink. After the LEDs
blink, three will stay lit and the Fortress.TeleCom will beep for one second.
2.
The LEDs that are lit show which voltage settings are selected. The LEDs are numbered in the
drawing below to help you identify them. Tables 4 and 5 on page 19 show the voltage settings
for each possible combination of LEDs.
For example, the U model default setting has LEDs 2, 3, and
4 lit (see diagram). You will find this combination of LEDs in
the first row of Table 4. This row shows the following:
• With 96 volts input or lower, the Fortress.TeleCom
switches to battery power.
• When input voltage drops to 109, the Fortress.TeleCom
begins to increase (boost) the output voltage.
• 120 is the nominal or expected input voltage.
Press this
button for 10
seconds (until
all of the lights
blink).
1
(D)
(C)
(B)
(A)
2
3
4
5
6
1
2
3
4
5
6
LED Numbers
Default Setting
