UPS for 480 Vac Grid, User Guide, doc. rel. 4.0
110
Figure 93: Alarm limits > ac voltage configuration
These parameters should not be changed.
You can also set a "hysteresis" value. This value damps the sensitivity of the alarms to prevent a
situation where, for example, a minor but frequent fluctuation of 1 Vac just above or below the
threshold value causes an ac voltage alarm to turn on and off many times, rapidly.
The hysteresis value is the number of volts that a measurement must change before an alarm
senses that the measurement has changed. So, in the example above, if you set a hysteresis value
of 2, the alarm state wouldn't change until the fluctuation grew to 2 Vac. This would reduce the
number of alarms while still ensuring that an alarm will be sounded when the voltage meets the
threshold.
8.2.6.2.3.
Setup > Alarms > Alarm Limits > Battery Low Limit (Per Battery)
Use the Battery low limit voltage to trigger an alarm that the battery level is close to depletion.
