UPS for 400 Vac Grid, User Guide, doc. rev. 4
78
8.2.5.2.2.
Setup > Alarms > Set Limits > AC limits
Use this function to set the voltage levels at which the "AC VOLTAGE HIGH" and AC VOLTAGE
LOW" alarms will be activated.
Figure 65: 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.
8.2.5.2.3.
Setup > Alarms > Set Limits >Temperature limits
This function lets you set the temperature (in °C) at which the high-temperature alarm and low-
temperature alarm are generated. The temperature is read from an optional internal temperature
sensor.
