MiCOM P921/P922/P923 - Schneider - error

P92x/EN FT/H42Page 56/70Technical GuideUser GuideMiCOM P921/P922/P923Function P921 P922 P923 Functiondf/dt1 todf/dt6F1+df/dt1 toF6+df/dt6X Instantaneous 1 st to 6 th rates of frequency variationprotection (“delta f / delta t”).XCombination of time delayed frequency trip threshold (tF)and frequency variation (df/dt): tF AND dF/dttAux1, tAux2 X X X Copy of the status of the logic input delayed by t Aux 1 or2tAux3 totAux5X X Copy of the status of the logic input delayed by t Aux 3, 4or 5CB ALAR. X X Circuit breaker alarm signalF OUT X X Frequency out of rangeCB FAIL X X X Circuit breaker failure signalEQU A toEQU HIN 1, IN2IN 3 to IN 5ACTIVEGROUPDU/DT 1 toDU/DT 4X X X Output of Boolean Equation A to Equation HXXXXXXXInput 1 to Input 5Active group1 st , 2 nd , 3 rd or 4 th rate of voltage variation protection(“delta U / delta t”)tVTS X X Voltage Transformer Supervision alarm, if enabled(VT Supervision/VT S Supervision submenu)2.7.6 "LATCH OUTPUT RELAYS" SubmenuThis menu makes it possible to latch the output contacts (RL2 to RL4 for MiCOMP921- and RL2 to RL8 for MiCOM P922 and P923) which are associated with one orseveral stages, the latch is done by relay and not by functions.The latched output contacts will then be maintained even if the fault hasdisappeared, and as long as a reset will not be performed. The reset an be done:−via a logic input (select "UNLATCH" in the list of available data, see"AUTOMAT CONTROL / INPUTS" menu)−via a local or remote communication linkIn order to latch one output relay, please go to the relevant cell corresponding to theselected information, press then key. Select the configuration (YES or NO) with and keys. Validate with the key.To gain access to the “latch output relay” submenu from the “Automatic control”menu, press followed by or until the desired submenu header is displayed.AUTOMATIC CTRLHeading of the Automatic control menu. To gain access to themenu from the default display press followed by or untilthe menu is displayed.