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3.2.6 Alarm Limit Settings Screen
Go to the Master Menu and move the highlighted cursor to LIMIT SETTINGS. Press the Select pad
and the Limit Settings screen is displayed.
The Alarm Limit Settings screen has Security Access to enable an authorized Liebert field-service
engineer to adjust the UPS system alarm limit settings
Figure 29 Alarm limit settings screen
Overload Alarm
This alarm setting initiates an alarm message on the display screen warning the operator that the
UPS system output current has exceeded the specified limit. This condition only activates an alarm.
The UPS does not shut down, but a separate control circuit will transfer the critical load to bypass if
the current and time of the overload condition exceeds system capability.
DC Overvoltage
This setting limits the maximum permitted level of the DC bus voltage. When this setting is exceeded,
an alarm indication appears on the module display screen, the UPS transfers the load to the bypass
line, and the input and battery circuit breakers trip open.
Battery Discharging
When the battery voltage on the DC bus falls below this limit for 5 seconds, a Battery Discharging
alarm message is displayed on the module screen. This means that the battery is discharging due to
an input voltage sag or interruption or a module output overload.
Low Battery
While the battery is discharging, this alarm warns the operator that the Battery Shutdown level is
approaching. This is generally set for a reserve time of approximately 5 minutes (typically 10 volts
above the 60-Minute Battery Shutdown voltage), based on full load operation.
Battery Shutdown (15 Minutes)
When the battery voltage decreases to this limit for five seconds during the first 15 minutes of the dis-
charge, the battery circuit breaker opens to prevent overdischarge. Note that the rated battery
reserve time at your site may be other than 15 minutes.
!
CAUTION
All alarm limit settings are application matched and factory-set. They should not be changed
casually. Contact Liebert Global Services for changing the alarm limit settings.
NOTE
The following battery alarm settings are factory-adjusted to the battery being utilized.
EXIT
SECURITY ACCESS
ALARM SETTINGS
CURSOR UP
CURSOR DOWN
CHOOSE
UP :
DOWN :
SELECT :
CURSOR UP
CURSOR DOWN
CHOOSE
UP :
DOWN :
SELECT :
Overload Alarm ...............................
DC Over Voltage ...............................
Battery Discharging ...........................
Low Battery .......................................
Battery Shutdown (15 minutes) ......
Upper Point (60 minutes) ......
Battery Rating (100%) .....................
Battery Rating ...................................
104 %
600 VDC
480 VDC
437 VDC
384 VDC
427 VDC
500 KW 15 min
250 KW 45 min
Temperature Limit Setting ................ 28 C
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