41
AC BREAKER OPEN
AC breaker on unit has been
turned off.
Turn on the AC breaker if you want the UPS to run from
the utility, otherwise it will stay on battery until energy is
exhausted at which time it will shut down.
AC LINE DISABLED BY
OPERATOR
An ACDIS command was
received via the serial
interface. This instructs UPS
not to use the AC line.
Type ACEN command over serial interface to re-enable
use of the utility, otherwise UPS will stay on battery.
AC LINE HAS BEEN
SWITCHED TOO OFTEN
UPS is having difficulty
connecting to utility.
If this continues for more than a few seconds, call for
service.
CANT GO TO AC LINE
DURING OVERLOAD
During an overload greater
than 125%, UPS is
disconnected from utility
Determine equipment causing overload and remove it
before UPS shuts down.
AC LINE OPEN DIAGNOSTIC
Internal Problem
Call for service
POWER IMBALANCE
DIAGNOSTIC
Internal Problem
Call for service
POWER IMBALANCE TIMER
IS ACTIVE
Internal Problem
Call for service
7.2 SHUTDOWN, OVERLOAD, DIAGNOSTIC, AND WARNING ALARM MESSAGES
Table 6 contains a list of Alarms that may occur and be displayed by the UPS. If they occur, the UPS
will automatically display the alarm. It will remain displayed until either the condition goes away or the
operator presses the “ALARM RESET” button. If multiple alarms occur, they will be displayed using the
following priority (arranged from highest to lowest): SHUTDOWN, OVERLOAD, DIAGNOSTIC, and
WARNING. For example if the AC breaker is turned off, an “AC BREAKER IS OPEN” warning alarm will
be displayed and will remain displayed until the breaker is turned on or the alarm is acknowledged by
pressing the “ALARM RESET” button. If the alarm is not acknowledged before the UPS exhausts its
batteries and shuts down, a “BATTERY WAS DISCHARGED” shutdown alarm will be displayed.
Acknowledging this shutdown alarm will result in the “AC BREAKER IS OPEN” warning being
displayed. Acknowledging this warning alarm will result in the LCD display that was being displayed
prior to the alarms to be displayed. Once acknowledged, the highest priority type of existing alarm will
continue to be flashed on the 1
st
line of DISPLAY#1 and DISPLAY#2. In addition, the red ATTENTION
light on the front panel will remain lit as long as the alarm exists. The reason for the alarm may be
viewed by pressing the “SELECT” key, selecting the “DISPLAY ALARMS” display, and selecting any of
the alarm types that are not presently displayed in reverse video.
A SHUTDOWN alarm occurs when the UPS output is shut down for any reason. Abnormal shutdowns,
those occurring due to any reason other than the Transfer Switch being rotated to the OFF IDLE or
OFF position, are saved in the UPS’ “shutdown” historical database. Every time the UPS’ output is
turned on or off is stored in the UPS’ “on/off” historical database. If the UPS shuts down due to an
overload or over-temperature condition, the UPS will not restart until the operator resets the condition.
To reset the condition, press the “SELECT” key, go to the “SYSTEM RESETS” display, and select the
reset needed, (it will be displayed in normal video as opposed to reverse video)
An OVERLOAD alarm occurs while either the load is drawing more current than the UPS is rated for or
an over-temperature problem exists. If the UPS shuts down due to the overload or over-temperature, or
the condition disappears, the OVERLOAD alarm will disappear. Details of the overload or over-
temperature are saved in the UPS’ “overload” historical database.
A DIAGNOSTIC alarm occurs if the UPS’ control detects an abnormal internal problem within the UPS.
In most cases, the UPS will continue to produce an output while a DIAGNOSTIC alarm exists; however,
it may not be able to draw power from the utility. The DIAGNOSTIC alarm will continue to exist until it is
either reset via the “SYSTEM RESETS” display or the Transfer Switch is rotated to the OFF position for
a long enough period to totally shut down the controls. It is important that if a DIAGNOSTIC alarm
exists and the UPS is still producing an output, that an attempt to reset the diagnostic via the “SYSTEM
RESETS” display be made. If that effort fails, attempt a Transfer Request to Bypass to run the load
