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Operation 55
3.1.6 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 s ystem alarm limit settings.
Figure 35 Module Alarm Limit Settings Screen
Overload Alarm (SCC and modules). This alarm setting initiates an alarm message on the display screen warn-
ing the operator that the UPS system output current has exceeded the specified limit. This condition only acti-
vates an alarm. The U PS 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 Over-Voltage (modules only). T his 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 module is
taken off-line (the module output circuit breaker is tripped open), and the input and battery circuit breakers trip
open.
Battery Discharging (modules only). When the battery voltage on the DC bus falls below this limit for 5 sec-
onds, a Battery Discharging alarm message is displayed on t he module screen. This means that the battery is dis-
charging due to an input voltage sag or interruption, or a module output overload.
Low Battery (modules only). While the battery is discharging, this alarm warns the operator that the Battery
Shutdown level is approaching. This is typically set for a reserve time of approximately five minutes (10 volts
above the 60-Minute Battery Shutdown Voltage), based on full load operation.
Battery Shutdown (15 Minutes) (modules only). When the battery voltage decreases to this l imit for five sec-
onds during the first 15 minutes of the discharge, the battery circuit breaker opens to prevent over-discharge.
Note that the rated battery reserve time at your site may be other than 15 minutes.
Battery Shutdown (60 Minutes) (modules only). During extended outages or deep sags of more than 15 min-
utes, the shutdown voltage limit will ramp up gradually to this 60-minute limit to prevent lengthy discharge and
possible battery damage. The battery circuit breaker opens when the battery voltage and the shutdown limit are
equal for five seconds. See the Battery Time screen for more information. Also refer to the battery manufac-
turer’s manual.
Battery Rating (100%) (modules only). This setting is the full load discharge rating of the battery in kilowatts
for the rated backup period. A typical rating might be 500 kW for 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.
EXIT
SECURITY ACCESS
CURSORUP
CURSORDOWN
CHOOSE
UP :
DOWN :
SELECT :
ALARM SETTINGS
CURSORUP
CURSORDOWN
CHOOSE
UP :
DOWN :
SELECT :
OverloadAlarm ...............................
DCOverVoltage ...............................
BatteryDischarging...........................
LowBattery .......................................
BatteryShutdown (15minutes) ......
UpperPoint (60minutes) ......
BatteryRating(100%) .....................
BatteryRating...................................
104 %
600 VDC
480 VDC
437 VDC
384 VDC
427 VDC
500 KW 15 min
250 KW 45min
DISCONTINUED
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