Under/Over Frequency Monitor Relay : AUOFMR2 Specifications Accurate Frequency monitoring with Crystal Controlled references. Trip Frequency Point can be selected with 0.01 Hz Resolution. Self-Calibration and check ON-Site facility inbuilt. Instrument tested to withstand as per IS:3231, IS:8686-1977 Specification. Two Independent set points programmable as Under or Over Frequency. RS232 & RS485 Communication Port for remote SCADA. AC Input from 230 / 110 / 63 V AC PT for Frequency Sensing. Frequency setting Range : 49.99 Hz to 40.00 Hz in steps of 0.01 Hz for Under Frequency and 50.01 Hz to 60.00 Hz in steps of 0,01 Hz for Over Frequency Accuracy Setting : +/- 0.01 Hz Repeat Accuracy better then 0.05 Hz. Delay Time Adjustment : 0 to 99.9 sec Accuracy +/- 5% or +/- 0.02s whichever is Higher. Programmable Hysterisis. This Relay is also available with 2 Stage df/dt and 2 Stage Under/Over Frequency Features. This is micro-controller based frequency monitoring relay with communication port for SCADA operation.