11.2.2.14 Thermal overload protection holding the auto-reclosing function backIf the input THOLHOLD (thermal overload protection holding reclosing back) isactivated, it will keep the reclosing function on a hold until it is reset. There may thus bea considerable delay between start of Auto-Reclosing and reclosing command to thecircuit-breaker. An external logic limiting the time and sending an inhibit to the INHIBITinput can be used. The input can also be used to set the Auto-Reclosing on hold for a longeror shorter period.11.2.3 Setting guidelines11.2.3.1 ConfigurationUse the PCM600 configuration tool to configure signals.Autorecloser function parameters are set via the local HMI or Parameter Setting Tool(PST). Parameter Setting Tool is a part of PCM600.Recommendations for input signalsPlease see examples in figure 139.ON and OFFThese inputs can be connected to binary inputs or to a communication interface block forexternal control.RIIt should be connected to the trip output protection function, which starts the autorecloserfor 3-phase operation (SMBRREC ,79) function. It can also be connected to a binary inputfor start from an external contact. A logical OR-gate can be used to combine the numberof start sources.If StartByCBOpen is used, the CB Open condition shall also be connectedto the input RI.INHIBITTo this input shall be connected signals that interrupt a reclosing cycle or prevent a startfrom being accepted. Such signals can come from protection for a line connected shuntreactor, from transfer trip receive, from back-up protection functions, busbar protectiontrip or from breaker failure protection. When the CB open position is set to startSMBRREC(79) , then manual opening must also be connected here. The inhibit is oftena combination of signals from external IEDs via the IO and internal functions. An OR gateis then used for the combination.1MRK 506 334-UUS A Section 11Control311Application manual
