Sepam - HV/MV Protection and control units (ENG) - Trinet

Starts per hour (cont’d)Commissioning, settingCheck:c the connections,c the positions of the microswitches SW associatedwith the current inputs,c the general parameters in the status menu.Set the following:c N start: starts per hour, N start may be set to 999 todisable the protection; all the outputs are set to zero,c H start: number of consecutive hot starts,c C start: number of consecutive cold starts,c T: time delay between starts, which defines aminimum shutdown time before another start will beallowed and counted.The T time delay between starts has several possibleuses:v to space out consecutive starts by a minimum time,v to avoid counting a start during transient currentcancellation, e.g. changeover to synchronousoperation after asynchronous starting.PrecautionIt is necessary to use the lock-out between starts in progress (F421/4) dataitem in program logic in order for all the starts to be counted.Kxxx F421/4closingoutput relayKxxx identifies the closing condition.Diagram of use of lock-out between starts dataSpecial useDuring reacceleration, the motor undergoes stress similar to starting stress withoutthe current having previously dropped to a value of less than 5% of Ib.This logic data may be used to increment the start counters.(1)under reference conditions (IEC 60255-6)SensorsThe starts per hour protection is related to thecurrents connected to the following connectors:current sensor connector1A or 5A CT 2BCSP2L1, 2L2, 2L3KyyyKyyy identifies reacceleration.Diagram of use of user-set incrementationK8532/36 Protection functions