25
LI 1020 and LI 1420
Make sure you have your unit’s model number and serial number. Then, call the nearest
office to order new batteries. Once you have the new batteries, follow these steps:
1. Find the battery drawer on the back of the UPS. Remove
the two screws in the drawer as shown. Then, pull the
drawer’s handle until it slides out of the UPS. The
drawer will stop moving just before it is out of the UPS.
Turn the drawer slightly to the left and pull it out the rest
of the way. Fortress has hot-swappable batteries. If
the UPS is off for any reason, install the new battery
drawer promptly once you have removed the old
drawer. This will help you avoid losing any parameter
changes you have made as well as some UPS settings.
If the UPS loses parameter changes, it will sound a
“CL” (Calibration Lost) alarm when you restart it. If
this alarm starts , see
2. Slide the new drawer you received completely into the
back of the UPS. (Turn the drawer slightly to the left as you put it in the UPS.)
3. Use the two screws you removed to fasten the new drawer to the UPS.
4. See page 23 for
about disposing of old batteries.
7E. Changing the Fortress’ Sensitivity to Power Problems
As shipped, your UPS is programmed to provide the best power protection possible. However, if
the voltage available to your UPS varies widely, or if it is unstable, you may need to adjust some
UPS settings to make the UPS less sensitive to power problems. Adjusting the settings is only
necessary if the power problems cause the UPS to run on
battery power often.
Input Voltage Range
As shipped, your UPS can accept a large amount of voltage variation without switching to
battery power. At the low end of this range, the UPS boosts the voltage before providing
output for your equipment. At the high end of this range, the UPS reduces the voltage before
providing output.
120-volt units can accept 88-149 VAC without switching to battery power.
220/230/240-volt units can accept 169-286 VAC without switching to battery power.
By changing a DIP switch position, you can set the UPS to accept even wider ranges:
120-volt units: 81-155 VAC.
220/230/240-volt units: 155-297 VAC.
