Best Power Unity/I UT3K User manual

UNITY/I
User Manual
UT3K, UT4K, UT5K, and UT8K
Single-Phase Uninterruptible Power Systems
MLS-0350B-OL
Copyright 1994-1997, Best Power. All rights reserved.
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IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions for your UNITY/I UPS.
The installation and use of this product must comply with all national, federal, state, municipal or local codes that apply.If you
need help, please have your UPS model and serial number and call Best Power’s Worldwide Service at 1-800-356-5737 (U.S.A.
or Canada) or 1-608-565-2100. Outside of the U.S.A. and Canada, you can also call the nearest Best Power office for more
information.
Best Power
P.O. Box 280
Necedah, Wisconsin 54646 U.S.A.
Telephone: [phone]
Toll-free: 1-800-356-5794 (U.S.A. and Canada)
FAX: [phone]
International Fax: [phone]
Worldwide Service, Best Power
P.O. Box 11
Necedah, Wisconsin 54646 U.S.A.
Telephone: [phone]
Toll-free: 1-800-356-5737 (U.S.A. and Canada)
FAX: [phone]
Best Power Technology Mexico, S.A. de C.V.
Golfo de Riga, 34
Colonia Tacuba
Mexico D.F. 11410
MEXICO
Telephone: [phone]
FAX: [phone]
Best Power Technology Pte. Ltd.
PICO Creative Centre, Level 5
20 Kallang Avenue
SINGAPORE 339411
Telephone: [phone]
FAX: [phone]
Sola Australia Ltd.
13 Healey Road
Dandenong Victoria 3175
AUSTRALIA
Telephone: [phone]
FAX: [phone]
Best Power Technology Limited
BEST House
Wykeham Industrial Estate
Moorside Road
Winchester
Hampshire
SO23 7RX
ENGLAND
Telephone: [phone]
Toll-Free: 0800-378444
FAX: [phone]
Best Power Technology GmbH
Am Weichselgarten 23
D-91058 Erlangen
GERMANY
Telephone: [phone]
Gebührenfrei: 0130/84/7712 (in Germany)
Fax: [phone]
Borri Elettronica Industriale Srl
Via dei Lavoratori, 124
20092 CINISELLO BALSAMO (Mi)
Milan, ITALY
Telephone: [phone]
FAX: [phone]
Best Power Technology AG
Limmatstrasse 12
8957 Spreitenbach
SWITZERLAND
Telephone: [phone]
FAX: [phone]
IF THE UPS IS SOUNDING AN ALARMand you need to know what the alarm means and how to respond, turn to Section
204. To silence the audible alarm, press the [CANCEL] key.Silencingthe audible alarm does not correct the condition that caused
the alarm.
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CAUTION!
All uninterruptible power systems (UPS) units contain dangerous voltages.
The unit can provide power from its batteries. To avoid possible personal injury or equipment dam-
age, assume that hazardous voltage is present at the unit’s output any time AC input power or DC
battery voltage is applied. To make certain there is no output voltage, turn the unit off, unplug the
unit, and disconnect all DC sources.
For units with line cords, the power supply cord is intended to serve as the disconnect device. The
socket-outlet shall be near the equipment and shall be easily accessible.
Before maintenance or repair, all connections must be removed. Before maintenance, repair, or
shipment, the unit must be completely switched off and unplugged or disconnected.
VORSICHT!
Vorsicht: Alle USV-Einheiten beinhalten gefährliche Spannungen.
Wenn der “Ein/Aus”-Schalter der USV eingeschaltet ist, kann an den Steckdosen der USV
gefährliche Spannung anliegen. Die Batterie der USV liefert selbst dann Strom, wenn die USV nicht
ans Netz angeschlossen ist.
Bei Modellen mit Netzstecker wird zum Abschalten des Geräts der Stecker aus der Steckdose gezo-
gen; bei anderen Modellen muß der Wechselstrom-Trennschalter benutzt werden. Die Steckdose muß
sich in der Nähe des Gerätes befinden und bequem erreichbar sein.
Achtung: Vor einer Wartung oder Instandsetzung müssen alle Anschlußleitungen entfernt werden.
Vor einer Wartung, Instandsetzung oder Transport muß die USV komplett abgeschaltet und
abgesteckt werden.
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Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
001 Storing the UNITY/I UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
002 If You Have a Question . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
100 Starting the UNITY/I UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
101 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
102 Setting the Time and Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
200 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
201 Front Panel Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
202 Front Panel Keys and Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
203 Inside the Front Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
204 Alarms: What They Mean and What to Do About Them . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
205 If You Have an Extended Power Outage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
206 Shutting Down the UNITY/I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
300 Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
301 Displaying Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
302 Changing Parameter Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
303 Parameter Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
400 Maintenance and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
401 Regular Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
402 Worldwide Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
403 Accessing the Alarm and System Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
500 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
600 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Appendix A: Remote Emergency Power Of (EPO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Appendix B: Attaching the Stabilizer Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
4/97
This manual is for units with ROM versions 1.06-1.08.
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1
Introduction
The UNITY/I™ UPS is easy to start and operate. Once you start the UPS, it provides continuous, computer-
grade power to your equipment. The UPS keeps you informed of its status with its front panel lights, four-digit
display, and audible signals (beeper). Using the display and front panel keys, you can display UPS information
and program some features.
This manual tells you how to start and operate the UNITY/I UPS. Begin with Section 100, “Starting the
UNITY/I UPS,” which will help you determine whether you need to do any installation before you start the
UPS.
001 Storing the UNITY/I UPS
If you are not going to use the UPS right away, store it between -20° and +40° Celsius (-4° to +104° F). If you
remove the batteries and store them separately, you can store the UPS at -20° to +60° Celsius (-4° to +140° F).
Batteries have a longer shelf life if you store them below 25° Celsius (77° F).Recharge stored batteries every
90 to 120 days.
002 If You Have a Question
Best Power is committed to outstanding customer service. Worldwide Service is happy to help you with your
problems or questions. A service technician is available 24 hours a day, 365 days a year. Just call Worldwide
Service or the nearest Best Power office, or send a fax to the Worldwide Service fax number. Please have your
unit’s serial number available when you call; this number is inside the front door of the UPS.
If you prefer to contact Best Power via computer, you can use Bulletin Board Service, CompuServe, or Best
Power’s World Wide Web site to get more product information.
Best Power’s toll-free Fax-on-Demand service is also available 24 hours a day to give you access to technical
notes and product information.
Worldwide Service: 1-800-356-5737 (U.S., Canada) or 1-608-565-2100
Worldwide Service FAX: [phone] or 1-608-565-2509
Bulletin Board Service 1-608-565-7424
CompuServe: Go BEST at any ! prompt.
World Wide Web Site: http:/www.bestpower.com
Fax on Demand: 1-800-487-6813 (U.S. and Canada)

* The drawings in Figure 1 show a UT3K, UT4K or UT5K. The UT8K is similar in appearance.
2
100 Starting the UNITY/I UPS
If your UNITY/I UPS does not have an input line cord and plug, it is a hardwired unit and must be installed by a
qualified electrician (see the
UNITY /I Installation Manual). After a qualified electrician has installed the UPS,
or if the UPS has an input plug, follow the instructions in this section to start the unit.
Make sure that the UPS is near the equipment it will protect. Leave at least 4 inches (100 mm) space on top of
and behind the UPS for ventilation. Do not put the UPS near a source of heat.
Make sure that the temperature is 0° to 40° Celsius (32° to 104° Fahrenheit) and the relative humidity is 0 to
95% without condensation. The air must be free of dust, chemicals that corrode or other contaminants. Air must
be free to move around the unit. The batteries’ service life is longer if the operating ambient temperature
stays below 25° C (77° F).
Front View* Back View*
Output
Receptacles
(optional)
Front Panel Lights,
Display, and Keys
Front Door
(Keyswitch and
Serial Number
Inside)
Serial Number
Main Output
Circuit Breaker
(some models)
Communication
Port
Line Cord
DC Port
Grounding
Terminal
Stabilizer
Bracket
Figure 1

3
101 Startup
1If you have a UT3K, UT4K or UT5K:Attach the stabilizer bracket to the back of the UPS (see Appendix B).
2Open the UPS’ front door by pulling the top of the door toward you (see Figure 1 to find the door). Make sure that
the keyswitch inside the front door is turned to “Off” (see
Figure 2).
3If your UNITY/I has an input line cord and plug:Plug in the UPS. If the plug does not match the wall outlet, have a
qualified electrician install the proper wiring and outlet.
If your UNITY/I is hardwired (does not have an input line
cord and plug),an electrician should have installed the UPS.
An external bypass/AC disconnect switch should be mounted
on the wall nearby (see Figure 3). Turn the UPS AC LINE
DISCONNECT SWITCH to “ON” and the UPS BYPASS
SWITCH to “OFF.”
4If you have an external battery pack(s)(see Figure 4), refer to the installation instructions that came with your battery pack(s). Then continue
with the steps below:
a. After completing the battery pack installation, hold down the Precharge
switch on the front of the battery cabinet for five seconds (see Figure 5).
b. Insert the key into the main DC switch on the front of the battery
cabinet. Turn it clockwise, then pull the switch out toward you. The
ON-LINE light will light on the battery pack cabinet.
5Turn the keyswitch inside the front door of the UPS to “Auto” (see Figure 6). The yellow BATTERY light will turn on briefly, then the green LINE
light will turn on.
Figure 2
Figure 3
Figure 4
Figure 5
Precharge Switch
Keyswitch
UNITY/I Battery Pack
Figure 6

4
The four-digit display will show the estimated runtime
in minutes and seconds (see Figure 7). For now, the
estimated runtime is high because there is no equipment
drawing power from the UPS. If the red ALARM light
is on,see Section 204 before you go on.
Note:Do not continue until the green LINE light is on. The UPS is set at the factory to automatically select
its output frequency; to do this, the UPS mustrun on AC line. If the UPS does not run on ACline the
first time you start it, you must either set parameters 14 and 15 or wait until the green LINE light
comes on before you switch on the connected equipment. To set the parameters, see Section 302.
6Once you switch on the unit and the LINE light comes on, the UPS will begin to charge the batteries. If this is the first time you have started the UPS, let the UPS run on line for at least 24 hours to charge the
batteries. You may use the UPS right away; however, its battery runtime will be reduced until it fully
charges the batteries.
7If your UNITY/I has receptacles on the back,switch off the equipment you want to connect to the UPS. Then, plug the equipment into the receptacles on the back of the UPS and switch on the equipment. If the
red ALARM light comes on, see Section 204.
If your UNITY/I does not have receptacles on the back,the electrician who installed the UNITY/I should
have connected your equipment to it. Turn the UPS BYPASS SWITCH (see Figure 3) to “UPS.” Then,
switch on the equipment connected to the UPS. If the red ALARM light comes on, see Section 204.
The UNITY/I UPS is now providing continuous, computer-grade power to your equipment and is ready to
provide battery backup power when needed.
Note:You may occasionally hear short “clicking” sounds inside the unit; these clicks are a normal part of
unit operation.
8If you plan to use CheckUPS software, connect the interface cable from the UPS to the computer system,
with the “UPS” end connected to the UNITY/I.
Using CheckUPS with Windows 95:Shut down your computer and insert the CheckUPS CD. Restart the
computer. Follow the instructions in the CheckUPS package.
Using CheckUPS withoutWindows 95:Start the computer and follow the instructions in the CheckUPS
package.
9Fill out the warranty registration card in this manual and return it to Best Power. Please return the registra- tion card within ten days of installation.
Figure 7

102 Setting the Time and Date
The UPS stores the time, date, and year in parametersthat you can program (see Section 300 for more about
parameters). These parameters must be programmed correctly so that the UPS can store accurate information in
its alarm and system logs. Whenever the UPS has been shut down, you should reset the time and date after you
restart the UPS. To set the time, date, and year parameters, follow the steps below.
Note:When the unit is in parameter mode, the functions of the front panel keys change. The label inside the
front door of the unit explains what the keys do when the UPS is in parameter mode. The label also
shows a “Programming Template” with different key names for parameter mode.
1.To enter the parameter mode, hold down the [CANCEL] and [RUNTIME] keys together. Release the keys when
the display changes to P-00(for parameter 0).
2.Enter the user password (377) by following these steps:
a. Press [CANCEL]. The display should show 0(the value of parameter 0).
b. Use the [%LOAD] key to change the display to 377. If you accidentally scroll past 377, use the [VOUT]
key to go back.
Note:If you hold downthe [%LOAD] or the [VOUT] key, the display will scroll more quickly after a few
seconds.
c. Press [RUNTIME]. The display should show Ito show you have entered the user password.
d. Press [CANCEL]. The display should show P-00.
3.Set the year (parameter 91) by following these steps:
a. Use the [%LOAD] key to change the display to P-9I.
b. Press [CANCEL]. The display should show a year.
c. Use the [%LOAD] orthe [VOUT] key to change the display to the correct year.
d. Press [RUNTIME]. The display should show the correct year.
e. Press [CANCEL]. The display should show P-91.

6
4. Set the date (parameter 90) by following these steps:
a. Use the [VOUT] key to change the display to P-90.
b. Press [CANCEL]. The display should show a date formatted as mm.dd (month.day).
c. Use the [%LOAD] or [VOUT] key to change the display reading to the correct month and day. For example, if
the date were March 27, you should enter “0327.”
d. Press [RUNTIME]. The display should show the correct date (mm.dd).
e. Press [CANCEL]. The display should show P-90.
5. Set the time (parameter 89) by following these steps:
a. Use the [VOUT] key to change the display to P-89.
b. Press [CANCEL]. The display should show a time formatted as hh:mm (hour:minute).
c. Use the [%LOAD] or [VOUT] key to change the display reading to the correct time in 24-hour time. For times
from 1 p.m. to 11:59 p.m., add twelve to the hour. For example, 2:30 p.m. would be 14:30.
d. Press [RUNTIME]. The display should show the correct time (in 24-hour time).
e. Press [CANCEL]. The display should show P-89.
6. To escape the parameter mode, press [VLINE] twice.

7
200 Operation
Once you start the UNITY/I UPS, it operates automatically. The UNITY/I keeps you informed of its status with
its front panel lights and four-digit display. If you wish, you can also use the front panel keys and four-digit dis-
play to view information about the UPS. In addition, the UPS has alarms that will alert you to UPS conditions
that require your attention.
201 Front Panel Lights
The lights on the front panel tell you several things about the operating status of the UPS. The four lights at the
top of the front panel are explained below. For an explanation of the nine small lights by the front panel keys,
see Section 202.
LINE Light (Green)
When the LINE light is on, the UPS is filtering and regulating
AC line power to provide computer-grade power to your equip-
ment.
When the LINE light is off, the UPS is not receiving adequate AC input power to run on line (because of a
power outage or a severe power problem). In most cases, when the LINE light is off, the BATTERY light will
be on.
BATTERY Light (Yellow)
When the BATTERY light is on, the UPS is providing power
from its batteries.
BYPASS Light (Yellow)
When the BYPASS light is on, the unit is in internal bypass
mode. Either the front keyswitch has been turned to “Bypass,”
or parameter 63 has been enabled (see Section 300).
When the UPS is in bypass mode, it continues to power your connected equipment, but the UPS does not regu-
late the AC power going to the connected equipment, and the UPS will not provide battery backup power.
The UPS does continue to provide lightning protection, noise protection, and isolated output.
Note:If the BYPASS light is on even though the UPS keyswitch is turned to “Auto” and the unit is not indicat-
ing an A-16 alarm, the UPS may have automatically placed itself in bypass mode because it detected a
problem with its circuitry. Call Best Power’s Worldwide Service (see Section 402).
ALARM Light (Red)
When the ALARM light is on, the UPS is alerting you to an
alarm condition. See Section 204.

Key(s)
Pressed Result
CANCEL Silences any alarm that is currently sounding. If the UPS detects a new alarm condition later, it will restart
the alarm beep. Silencing an alarm does not correct the condition that caused it (see Section 204).
Cancels a battery test if one is in progress.
Holding the key down for two seconds clears an alarm. The alarm will restart if the condition that caused
it still exists.
If the UPS has shut down because of an alarm condition, holding the key down for two seconds restarts the
UPS ifthe problem that caused the alarm has been solved and the unit is not in bypass mode.
%LOAD Displays the percentage of the UPS’ total power capacity that your equipment is using.
VLINE Displays the AC input line voltage that the UPS is presently receiving.
RUNTIME Displays the estimated runtime remaining (in minutes and seconds). Note:The runtime display is most
accurate when the UPS is running on battery power.
VBATT Displays the present battery voltage (nominal is 48 V).
TEMP Displays the internal ambient temperature of the UPS in degrees Celsius.
SCAN Starts the scan mode. In scan mode, the UPS scrolls through a display of VBATT, VOUT, TEMP, %LOAD,
VLINE and RUNTIME. Each value displays for two seconds, and the small green lights tell you which value
is currently displayed.
TEST Holding down this pair of keys for two seconds starts a test of the front panel lights (except BYPASS) and
four-digit display. Note: If Parameter 77 (Test on Demand) is enabled, the unit will also test the batteries. If
parameter 77 is enabled and parameter 62 (Nominal Input Voltage) is set, the unit will also test the BYPASS
light by briefly switching to internal bypass mode. See Section 300.
Table 1: Front Panel Key Functions (When parameters and logs are NOT displayed)
8
202 Front Panel Keys and Display
The front panel keys and four-digit display make it easy for
you to display information about the UPS.
The word above each key tells you what information the UPS
will display if you press that key. The words below the keys
tell you what information the UPS will display if you press the
two keys at the same time.
When you use the keys to display information, a small green
light near the key(s) you pressed lights to tell you what
information is currently displayed (Figure 8). The information
remains on the display until you press another key.
Table 1 explains what the keys do when the UPS is in its normal display mode. When you are displaying para-
meters or alarm and system logs, the keys have different functions; see Table 3 in Section 302 and Table 6 in
Section 403.
Figure 8

203 Inside the Front Door
The UPS’ front door is below the front panel keys (see Figure 1 in Section 100). To open the door, pull the top
of the door toward you. The keyswitch and Emergency Power Off (EPO) reset button are inside the front door.
In addition, the labels inside the door contain useful reference information. See Figure 9.
The Keyswitch
Using the keyswitch, you can put the UPS in auto mode, shut the unit off, or put the unit in internal bypass
mode.
• Auto: When the keyswitch is turned to “Auto,” the UPS provides computer-grade power to your
equipment. Usually, the UPS operates on AC line power, filtering and regulating utility
power. When necessary, the UPS switches to battery power.
• Off: When the keyswitch is turned to “Off,” the UPS is off and does not provide power to the
connected equipment. See Section 206 for information on completely shutting down the
UPS.
• Bypass:When the keyswitch is turned to “Bypass,” the unit provides power to your connected
equipment, but the UPS does not regulate this power, and the UPS cannot provide battery
backup power. However, the UPS does provide lightning protection, noise protection, and
isolated output.
The EPO Reset Button
If the UPS shuts down because of an Emergency Power Off (EPO) signal sent to its communication port,
use this button to restart the unit. After an EPO shutdown, the UPS' four-digit display scrollsEPO. The
EPO reset button does not serve as a reset button for any other purpose. See Appendix A for more
information on EPO.
Figure 9

10
204 Alarms: What They Mean and What to Do About Them
The UNITY/I alerts you to some UPS conditions. If the UPS
detects an alarm condition, it:
• lights the red ALARM light.
• sounds an audible alarm.
• shows an alarm code on the four-digit display
(see Figure 10).
Codes A-08 (Low Battery) and A-16 (Auto Bypass) are not
alarm conditions. When either of these codes are displayed,
the red ALARM light will not be on and the UPS will not
sound an audible alarm.
Here’s how to react:
1. If you want to silence the audible alarm,press and release the [CANCEL] key. Note that silencing the audible
alarm does not correct the condition that caused it; the ALARM light stays lit to remind you that the alarm
condition still exists. If the UPS detects a new alarm condition, it will sound a new audible alarm.
2. Read the alarm code(s) on the four-digit display. If more than one alarm condition exists, the four-digit dis-
play will show each alarm code, one at a time. If the display shows a dot moving from right to left, press any
of the front panel keys to display the alarm code(s).
3. Find the alarm(s) in Table 2. The table tells what the alarm means and gives a possible solution. If the table
tells you to phone Best Power’s Worldwide Service, phone the nearest Best Power office (in the U.S.A. and
Canada, call 1-800-356-5737). Please have the UPS serial number available when you call; you will find this
number inside your unit’s front door. Call from a telephone that is as near the UPS as possible.
Table 2: Alarms
Figure 10
Press the [%LOAD] key. Shut off the equipment
connected to the UPS one piece at a timeuntil the
%LOAD display shows 100 or less. Remove the
equipment that you shut off. If you need help, call
Best Power’s Worldwide Service or the nearest Best
Power office.
Your equipment is drawing more
power than the UPS is designed
to provide.
Overload
A-01
Do an orderly shutdown of your equipment. You do
not need to shut off the UPS. The UPS will
automatically shut itself down, but it will leave its
microprocessor on. This means that when adequate
AC input power returns, the UPS can automatically
restart and begin to recharge its batteries (unless
you have set Parameter 03 to disable the auto restart
feature).
The UPS is running on battery
power and the runtime remaining
is low. (At the factory, the UPS is
programmed to sound this alarm
when 2 minutes of runtime are
left). The UPS display switches
between the alarm code (a-00)
and the estimated runtime.
Low Runtime
A-00
What to DoWhat It MeansAlarmAlarm
Code

11
Table 2: Alarms (continued)
Alarm
Code Alarm What It Means What to Do
A-07
A-06
A-05
A-04
A-03
A-02
High Battery
Memory Error
Check Inverter
Check Battery
High Ambient
Temperature
Circuit Breaker
Warning/Shutdown*
Battery voltage is too high.
There may be a problem
with the parameter settings,
batteries, or charging
circuit.
On startup, the unit has
failed its automatic memory
test.
The UPS has detected a
possible problem with the
inverter.
The UPS has detected a
possible problem with the
batteries.
The temperature inside the
UPS is high.
There is a high output
current from the UPS. This
usually happens because the
equipment connected to the
UPS is overloading it.
Phone Best Power’s Worldwide Service or the nearest
Best Power office.
Shut the unit down and restart it. If the alarm sounds
again, hold down the Cancel key for about 3 seconds. If
the alarm does not stop, phone Best Power’s Worldwide
Service or the nearest Best Power office; the UPS must be
recalibrated.
Phone Best Power’s Worldwide Service or the nearest
Best Power office.
Phone Best Power’s Worldwide Service or the nearest
Best Power office. If you have an external battery cabinet,
first make sure that the DC switch on the battery cabinet
is switched on.
If you can identify a source of heat outside of the UPS
(such as an unusually high room temperature), correct the
cause of the high temperature. Also, make sure that noth-
ing outside the UPS is blocking the vents on the front and
back of the unit. If the alarm continues, phone Best
Power’s Worldwide Service or the nearest Best Power
office.
The UPS will shut down. Shut off all of the equipment
connected to the UPS. Then, restart the UPS by holding
down the [CANCEL] key for two seconds. Next, press
the [%LOAD] key. Then, watch the %LOAD display as
you switch on the load equipment one piece at a time.
Once the %LOAD reaches “100,” the unit is fully loaded
and you should not start any additional equipment
connected to the UPS. If you need help, call Best Power’s
Worldwide Service or the nearest Best Power office.
* In this case, “Circuit Breaker” does not refer to the circuit breaker(s) on the output receptacles panels of some UNITY/I
models. Instead, the alarm refers to the UPS’ software-controlled overcurrent protection, which operates like a circuit
breaker.

Phone Best Power’s Worldwide Service or the
nearest Best Power office.
—
Phone Best Power’s Worldwide Service or the
nearest Best Power office.
If the UPS also has an A-08 alarm,see A-08,
Low Runtime, in this table.
If the UPS is in internal bypass (battery
maintenance) modebecause parameter 63 has
been enabled, the UPS will display A-16 until
you reset parameter 63 to “0.”
Phone Best Power’s Worldwide Service or the
nearest Best Power office.
The UPS will shut down. Phone Best Power’s
Worldwide Service or the nearest Best Power
office.
Phone Best Power’s Worldwide Service or the
nearest Best Power office.
Phone Best Power’s Worldwide Service or the
nearest Best Power office. Note:If the UPS
begins running on battery power, monitor the
runtime so that you may do an orderly shutdown
of your equipment if runtime gets low.
The unit has detected a possible
problem with the internal power
supply.
—
The UPS has detected a possible
problem with the fuse board.
The UPS is in internal bypass
mode. If AC line is present, the
UPS continues to provide power
to the connected equipment, but
it does not regulate the power
going to the connected equip-
ment, and it will not provide
battery backup power.
The UPS has detected a problem
with a MOV (Metal Oxide
Varistor) inside the unit.
The UPS AC output voltage is
high.
The UPS AC output voltage is
low.
There is a problem inside the
unit.
Check Power Supply
Reserved
Check Fuse Board
Auto Bypass
(Advisory Condition)
Check MOVs
High AC Out
Warning/Shutdown
Low AC Out
Shutdown
Tap Regulator Alarm
A-19
A-18
A-17
A-16
A-15
A-14
A-13
A-12
——Reserved
A-10
Phone Best Power’s Worldwide Service or the
nearest Best Power office.
The fan inside the UPS is not
functioning properly.
Check Fan
A-09
Before this code is displayed, you should have
received a “00” (Low Runtime) alarm to warn
you to shut down your equipment. When accept-
able AC input power returns, the UPS will auto-
matically restart (unless you have set parameter
03 to disable the auto restart feature). When the
UPS restarts, it will temporarily run in a bypass
(nonregulating) mode (see A-16). Codes A-08
and A-16 will display until the battery voltage
returns to above 48VDC for 2 minutes.
Runtimes will remain low until the unit fully
recharges the batteries.
Battery voltage is too low for
the UPS to operate on battery
power.
Low Battery
(Advisory Condition)
A-08
What to DoWhat It MeansAlarmAlarm
Code
12
Table 2: Alarms (continued)

205 If You Have an Extended Power Outage
If a power outage lasts a long time, the UNITY/I continues to provide power for your equipment until it reaches
the end of its runtime. You can check how much runtime remains by pressing the [RUNTIME] key on the front
panel. At a set number of minutes before the end of the runtime (factory default is two minutes), the UPS sounds
a “Low Runtime” alarm (A-00). When the UPS gives this alarm, do an orderly shutdown of your equipment.
However, do not shut off the UPS. The UPS will shut itself down, but it will leave its microprocessor on. As
soon as normal AC line power returns, the UPS will automatically restart itself (unless you have set parameter
03 to disable the auto restart feature) and begin recharging its batteries. If you know that the power outage will
be long (for example, a day or longer), you may wish to shut down the UPS. See Section 206.
206 Shutting Down the UNITY/I UPS
Usually, you do not need to shut down the UPS, even if your equipment will be shut down for several days.
There may be times, however, when you want to shut down the UPS, such as when you will not be using the
UPS for an extended period of time, when the UPS is being serviced, or before you move the UPS. Best Power
does not recommend shutting down the UNITY/I on a daily basis.To shut down the unit, follow the instructions
below.
Note:While the UPS is shut off, recharge the batteries every 90 to 120 days. You can do this by restarting the
UPS for 24 hours.
1. If your UNITY/I does not have an external bypass switch,switch off the protected equipment.
If your UNITY/I has a “Break Before Make” external bypass switch(the words above the UPS BYPASS
SWITCH read, in this order, “LINE” “OFF” “UPS”), turn off the protected equipment. Then, turn the UPS
BYPASS SWITCH to “LINE.” Switch the protected equipment back on.
If your UNITY/I has a “Make Before Break” external bypass switch(the words above the UPS BYPASS
SWITCH read, in this order, “LINE” “UPS” “OFF”): Turn the UPS BYPASS SWITCH to “LINE.”
2. Turn the keyswitch inside the unit’s front door to “Off.”
3. If your UPS does not have an external bypass switch,disconnect the UPS by shutting off its circuit breaker
or by unplugging the UPS. Shutting off the circuit breaker is preferred, but if other pieces of equipment are
connected to the same breaker, you may want to leave the breaker on and unplug the UPS.
If your UPS has an external bypass switch,turn the UPS AC LINE DISCONNECT SWITCH to “OFF.”
4. If you have an external battery pack, push in the main DC switch on the front of the cabinet.
5. When you are ready to restart the UPS, follow the entire startup procedure in Section 100.
CAUTION
Before switching an external make-before-break (MBB) bypass switch to the LINE position, the BYPASS
light on the UPS front panel must be lit. If you operate an external MBB bypass switch while the UPS is
operating on line power or on battery power, equipment damage may result. Refer to Best Power
publication “TIP 410” for proper bypass switch operating instructions.

14
300 Parameters
The UPS uses some of its parameters to keep track of information, operating conditions, and power conditions.
Other parameters allow you to program some of the unit’s features. This section explains how to display and
change some UNITY/I parameters.
301 Displaying Parameters
This section explains how to display parameters using the front panel keys and four-digit display. The table in
Section 303 contains more information about what many of the parameters mean.
Note:When the unit is in parameter mode, the front panel keys have different functions. See the label inside the
UPS front door for an explanation of the key functions in parameter mode. The label also shows a
“Programming Template” with different key names for parameter mode.
1. To enter the parameter mode, hold down the [CANCEL] and [RUNTIME]keys together for two seconds. Release
the keys when the four-digit display changes to P-00.
P-00is a parameter number. The first column of the parameter table in Section 303 contains the parameter
numbers.
2. Whenever a parameter number (P-XX) is displayed, you can use the following keys to go to the parameter
that you wish to display:
• Press [%LOAD] to go to the next parameter number.
• Press [VOUT] to go back to the previous parameter number.
Note:To scroll through the parameter numbers quickly, hold downthe [%LOAD] or [VOUT] key.
3. Press [CANCEL] to display the parameter’s value. Example: Parameter 7 is the Low Runtime Alarm setpoint.
To display the setpoint, first display parameter 7 by following steps 1 and 2 above. Then, with P-07on the
display, press [CANCEL] to display the value. If the value is 2, the UPS will sound a Low Runtime alarm
when two minutes of runtime are left. The parameter table in Section 303 describes the information you can
find in some UNITY/I parameters.
4. Press [CANCEL] to return to the parameter number (P-XX). Note that the [CANCEL] key allows you to switch
between the parameter number and parameter value.
5. If you wish to display additional parameters, repeat steps 2-4.
6. To escape parameter mode, press [VLINE] twice.

302 Changing Parameter Values
You can set some of the parameter values to program certain UPS features. The table in Section 303 describes
many of the parameters.
Make sure that you FULLY understand a parameter before you try to change the value. If you set certain
parameters improperly, the UPS may not operate correctly.
1. Hold down the [CANCEL] and [RUNTIME] keys at the same time for two seconds. Release the keys when the
display changes toP-00. Then, press [CANCEL]. The display should show 0.
2. As the table in Section 303 shows, you will need a password to change parameters. The user password is
377. To enter it, follow the steps below.
a. Use the [%LOAD] orthe [VOUT] key to change the display to 377.
Note: To scroll the display more quickly, hold downthe [%LOAD] or [VOUT] key.
b. Press [RUNTIME] to enter the password. The display should read I(for password level 1).
You may now change parameters that require a user password. For password requirements, see the third
column of the parameter table in Section 303.
Note: If no keys are pressed for five minutes, the UPS password level goes back to level “0,” and you
must re-enter the user password.
3. Press [CANCEL] to return to the parameter number display (P-XX). Note that the [CANCEL] key lets you
switch between the parameter number and parameter value.
4.Use the [%LOAD] orthe [VOUT] key to go to the parameter that you wish to change. Then press [CANCEL] to
display the parameter value.
5.Whenever a parameter value is displayed, use these keys to change the setting:
•Press [%LOAD] to increase the setting.
•Press [VOUT] to decrease the setting.
Note: In step 1, you entered the user password. If a parameter requires a higher password for changes, the
UPS will not let you change that parameter.
6.To enter the new value, press [RUNTIME]. The UPS beeps to confirm that the new value has been entered. If
you wish notto save a change that you have made, press [VLINE] and the value will remain at its original
setting.
7.If you wish to change additional parameters, repeat steps 3-6.
8.To escape parameter mode, press [VLINE] twice.

Table 3 explains what each of the keys does when a parameter number or parameter value is displayed.
Table 3: Parameter Mode Key Functions
303 Parameter Table
The parameter table, Table 4, explains many of the unit’s parameters. See Sections 301 and 302 for information
on displaying and changing parameters.
Note: Some parameters are not listed. These parameters are used only in special circumstances or are intended
to help qualified service personnel troubleshoot, adjust, and calibrate the UPS.
Table 4: Parameters
Key Programming
Template Key Name When a Parameter Numberis Displayed When a Parameter Valueis Displayed
CANCEL #Switches to the parameter
value. Switches to the parameter number.
VOUT —Goes back to the previous
parameter number.Decreases the parameter setting.
%LOAD +Goes to the next parameter
number.Returns to the parameter number display without saving any changes made to the parameter value.
VLINE ESC Escapes parameter mode. Returns to the parameter number display without
saving any changes made to the parameter value.
RUNTIME 5This key has no function
when the parameter number
is displayed.
Enters the new parameter setting.
16
Parameter
Number Parameter Name Password Level Required to
Change Setting
Sample
Parameter
Value
Parameter Description
P-13
P-00 Password None 0Allows you to enter a password. See Section 302.
Frequency
P-03 Auto
Restart User 1When the UPS shuts itself down, this parameter determines
whether the UPS restarts automatically. If set to “1,” the UPS
restarts itself when conditions allow. If set to “0,” you must
manually restart the UPS by turning the keyswitch to “Off”
and back to “Auto.” Choices:0 (Disable) or 1 (Enable).
Change not
allowed
P-05 Nominal
Output
Voltage
User 240 Sets the nominal output voltage. This setting should equal the
output voltage wired at the factory or by your electrician. Call
Best Power’s Worldwide Service or the nearest Best Power
office before you try to change this setting. Range of values:
180-260.
60.0
P-07 Low
Runtime
Alarm
Setpoint
User 2If the UPS is running on battery power, it sounds a Low
Runtime alarm (A-00) when the amount of battery runtime
remaining (in minutes) is equal to or less than this value.
Range of values:1-99.
The frequency that the UPS is now supplying to your
equipment.