Under Frequency

The Under Frequency protection function generates the following signals:

Alarm: Measured frequency goes below the alarm level.
Trip: Measured frequency goes below the trip level for the specified time delay.

NOTE: This function enables after 500 ms once the voltage is detected.

The Under Frequency protection function has the following configurable settings:

Parameter	Setting range	Default value
Function	Disable Alarm Trip Alarm + Trip	Disable
Trip Level	90–100% of nominal frequency in step of 1%	94% of nominal frequency
Time Delay	0.1–6000.0 s in step of 0.1 s	0.1 s
Alarm Level	90–100% of nominal frequency in step of 1%	94% of nominal frequency
Reset Mode	Reset key DI Communication Auto	DI + Reset Key
Auto-Reset Delay (applicable only if Reset mode is Auto)	0.0–6000.0 s in step of 0.1 s	0 s