18
ENGLISH
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
blink. After the LEDs blink, three will stay lit and the Fortress
will beep for one second.
2.
The LEDs that are lit show which voltage settings are select-
ed. 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 switches to
battery power.
• When input voltage drops to 109, the Fortress begins to
increase (boost) the output voltage.
• 120 is the nominal or expected input voltage.
• When input voltage rises to 130, the Fortress begins to
decrease (buck) the output voltage.
• With 146 volts input or higher, the Fortress switches to
battery power.
3.
Use the appropriate table on the next page to decide which
combination of settings you need; note which LEDs
must be lit for this combination. Then, press (for about
1 second) and release the button to move to the next com-
bination of LEDs. If you hold the button in longer than
10 seconds, the Fortress will save the setting that is dis-
played. Continue pressing and releasing the button until
the proper LEDs are lit.
4.
Once the correct LEDs are lit, press and hold the button
for 10 seconds to save your changes. If the Fortress is
running on AC input power, the display will change back
to the percent of full load. The new values will take effect
after the display returns to normal mode.
1
(D)
(C)
(B)
(A)
2
3
4
5
6
1
2
3
4
5
6
LED Numbers
Default Setting
Press this button
for 10 SECONDS
to save your
changes.
Press this button
BRIEFLY to
scroll through the
settings.
Press this
button for 10
seconds (until
all of the lights
blink).
