1MAC309294-MB F Section 5Control functionsRER620 343Technical ManualIn the sectionalizer and midpoint mode, if the setting Reset on power up is set as "TRUE",then after any re-initialization activity in the relay like power off-and-on, software reset,committing to a setting change etc., the loop control will be in reset or active state andRESET_OUT output will be FALSE. If the setting Reset on power up is set as "FALSE",then after any re-initialization activity in the relay, the loop control will be in non-reset orin-active state and RESET_OUT output will be TRUE. In the later case, to arm the loopcontrol, RESET_IN input is triggered with a positive pulse. The loop control goes intonon–reset state if LCM_TRIP output is activated in sectionalizer mode orSET_GROUP_CHANGE output is activated in mid-point mode. After restoring the line,the loop control is reset by providing a positive pulse through RESET_IN input.In the tie-point mode, after the power on and power off of relay, the loop control willalways go into non–reset mode due to safety reasons. The loop control can be moved toactive state by providing a positive pulse at RESET_IN input. The loop control goes intonon–reset state if LCM_CLOSE output is activated. After restoring the line, the loopcontrol is reset by providing a positive pulse through RESET_IN input.The RESET_OUT indicates whether the loop control is in reset or non-reset state. IfRESET_OUT is TRUE it indicated the loop control is in non reset state and vice versa.Table 312: Reset LogicThe sectionalizing reset setting provides automation on the reset logic in sectionalizingmode. If sectionalizing reset is TRUE then if the loop control is in non reset mode and ifthe bus voltage is above live bus threshold for live bus time then the loop control will gointo reset mode automatically. This feature is only applicable in sectionalizing reclosermode.5.4.5 ApplicationThe loop control scheme is implemented to improve the circuit reliability and to providemore effective system operation. The loop control function is used in implementing theloop control schemes.DLCM settingDLCM statebeforere-initialization ofrelayDLCM function state after re-Initialization of relaySectionalizing mode Midpoint mode Tie point mode“Reset on powerup” =TRUENOT RESET DLCM function isreset/armed/activated &“RESET_OUT” output isFALSE. This is irrespectiveof the previous statebefore Re-initialization.DLCM function isreset/armed/activated &“RESET_OUT” output isFALSE. This is irrespectiveof the previous state beforeRe-initialization.DLCM function is always non-reset/in-active and “RESET_OUT” outputwill be TRUE for safety reasons.To activate the function, RESET_IN inputis triggered with a positive pulse orthrough LHMI “Loop Scheme Reset”buttonRESET“Reset on powerup” =FALSENOT RESET DLCM function is non-reset/in-active and“RESET_OUT” output willbe TRUE. To activate thefunction, RESET_IN inputis triggered with a positivepulse or through LHMI“Loop Scheme Reset”buttonDLCM function is non-reset/in-active and“RESET_OUT” output willbe TRUE. To activate thefunction, RESET_IN inputis triggered with a positivepulse or through LHMI“Loop Scheme Reset”buttonDLCM function is always non-reset/in-active and “RESET_OUT” outputwill be TRUE for safety reasons.To activate the function, RESET_IN inputis triggered with a positive pulse orthrough LHMI “Loop Scheme Reset”buttonRESET