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7C. Replacing the Fuse
If you have any problems replacing the fuse, please call the nearest
office. (See
the beginning of this manual.)
1. If you have never replaced the UPS fuse before, you can use the spare fuse in the fuse holder.
If you need a new fuse, you can order one by calling the nearest Best Power office; otherwise,
check the label on the back of the UPS for the fuse’s size and type. Make sure your new fuse
is the size and type shown on the UPS label.
2. Shut off all equipment plugged into the back of the UPS. Next, you must shut down the
UPS by pressing the key on the front panel. Unplug the power cord from the back of
the UPS.
3. The drawing shows the 520 and 720 fuse holder. To find the
1020 or 1420 fuse holder, see
. To open the fuse holder,
push on the tab until the fuse holder pops out.
4. Pull the fuse holder out until you can see the fuse shown.
5. If you have not used the spare fuse yet, there will be two
fuses in the fuse holder. The used fuse is on the side with the
metal contacts. Remove this fuse from the fuse holder and put
the spare fuse (or a new fuse) in its place.
6. Push the fuse holder back in until it latches.
7. To test the UPS, plug it into the wall outlet. Press the key on the front panel to restart the
UPS. Then, switch on the equipment plugged into your UPS. Battery backup time may be low
until the UPS recharges its batteries. If the UPS does not restart, call the nearest
office.
7D. Replacing the Batteries
Fortress’ batteries are user-replaceable and hot-swappable. This means that you can safely and
easily replace the batteries while the UPS is running. All you’ll need is a Phillips screwdriver.
Before you replace the batteries, make sure that you read the safety
information below.
NOTE: If you have a power outage while you are replacing the batteries, the UPS will not be
able to run on battery power, and your protected equipment will shut down.