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before providing output for your equipment. At the high end of this range, the UPS
reduces the voltage before providing output. These are the input voltage ranges that
Fortress models can normally accept without switching to battery power:
LI 720U-B71 and LI 1420U-B73 (120-volt units): 91-144 VAC
LI 720E-B72 and LI 1420E-B74 (230-volt units): 175-277 VAC
By changing a DIP switch position, you can set the UPS to accept even wider ranges:
LI 720U-B71 and LI 1420U-B73 (120-volt units): 84-150 VAC
LI 720E-B72 and LI 1420E-B74 (230-volt units): 161-287 VAC
Please note that if you change the DIP switch setting, the output voltage range that
your UPS provides to your equipment is wider as well (see Sections
). To
change the DIP switch setting, follow these steps:
1. Find the DIP switches on the back of the UPS. (See the drawings below.) Then,
find DIP switch 3.
2. Use a nonmetal object such as a toothpick to move DIP switch 3 from one side to
the other; if the UPS is on, it will beep. Make sure you do not accidentally
change the position of another DIP switch.
Sensitivity to “Glitches” in Input Power
The UPS is designed to protect your equipment from
problems or “glitches” in input power. If the glitches are
very severe, the UPS may need to run on battery once in
a while to protect your equipment. If the UPS must run on
battery power often because of problems in your input power,
you may want to lower the UPS’ sensitivity to these prob-
lems to save battery power. To do this, follow these steps:
1. Find the DIP switches on the back of the UPS. (See
the drawings above.) Then, find DIP switch 2.
2. Use a nonmetal object such as a toothpick to move DIP
switch 2 from one side to the other; if the UPS is on, it will beep. Make sure you
do not accidentally change the position of another DIP switch.
DIP Switches
Normal
Range
Wider
Range
4
3
2
1
Normal
Sensitivity
Less
Sensitivity
4
3
2
1
E
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