1MRS 751802-MUM Protection RelayTechnical Reference Manual, Standard ConfigurationsREX 52197Avt&#! ApviypxiysU8T7.4.3. MCS 3IThe supervision function block MCS 3I detects interruptions in energizing circuits.The function block supervises the energizing circuits by comparing the measuredphase currents. If one or two phase currents exceed the setting “High limit”, whilethe measured phase current in the remaining one or two phases is below the setting“Low limit”, the output ALARM is activated after the adjustable alarm delay.The function block is disabled if all input currents are below the setting “Low limit”.The ALARM output will reset automatically when the fault disappears.The phase current supervision function block operates on the numerically calculatedfundamental frequency component of the phase currents.Avt&#" ApviypxiysH8T"D7.4.4. MCS 3UThe supervision function block MCS 3U detects interruptions in energizing circuits.The user can select three-phase or two-phase operation. The function block can alsobe set out of use by means of the parameter.The function block supervises the energizing circuits by comparing the measuredvoltages. If one or two voltages exceed the setting "High limit", while the measuredvalues of the remaining one or two voltages are below the "Low limit", the outputALARM is activated after the set alarm delay.The function block is disabled if all input voltages are below the setting "Low limit".The ALARM output resets automatically when the fault disappears.Avt&## ApviypxiysH8T"VTCSSTATEBS ALARMTCS1ALARMMCS 3IALARMMCS 3U
