Appendix A: Adjusting Voltage Settings - Best Power Fortress 750 Guia Del Usuario

any warranty with respect to them. This warranty does not cover repair or replacement because
of damage from unreasonable use (for example only, damage from road hazard, accident, fire or
other casualty, misuse, negligence, or incorrect wiring) and any use or installation not in
conformance with instructions furnished by BEST POWER, or repairs or replacements needed
because of modifications or parts not authorized or supplied by BEST POWER.

Appendix A: Adjusting Voltage Settings

When the unit is not sounding an alarm, you can use the button shown below to change the
following:
• Nominal Voltage — The normal voltage the UPS is programmed to expect, and the nominal UPS
• Buck — The input voltage at which the Fortress decreases voltage before providing output because
the input voltage is too high.
• Boost — The input voltage at which the Fortress 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
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 IBM Service Support.
Do not change voltage settings when unit is operating on inverter.
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 selected.
The LEDs are numbered in the drawing below to help you
identify them. Tables 4 and 5 on page 23 show the voltage
settings for each possible combination of LEDs.
For example, by default, LEDs 2, 3, and 4 will be lit (see
diagram) if your UPS is a U, B40, B42, or B44 model. 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.
output voltage under line loss conditions.
because AC input voltage is very low or because it is very high.
LED Numbers
21
Press this
button for 10
seconds (until
all of the lights
blink).
1 1
2 2
3 3
4 4
5 5
6 6
Default Setting
ENGLISH