Mains pro 1.6.1 Global Guide
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Image 8.1 Voltage hysteresis for overvoltage
Image 8.2 Voltage hysteresis for undervoltage
8.2 Floating 10 minutes average overvoltage
The unit calculates floating average of the measured voltage in each phase over 10 minutes interval. If any of
the three phase values overreaches the setpoint Avg V> [V] (page 55), TRIP (page 31) is issued, LED U
flashes and counter of voltage disturbances is incremented. As the Last Trip record, the message "Vavg" is
displayed. The protection stage is blocked for the first 10 minutes after power-up of the unit.
8.3 ANSI 81H Overfrequency, 81L Underfrequency
The frequency value measured on phase L1 is compared with the preset limit of overfrequency or
underfrequency. When any of the preset limits is over/underreached, the appropriate LED signal is issued by
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