5–38 469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUALCHAPTER 5: SETTINGS5.6.2 Thermal ModelPATH: SETTINGS ZV S5 THERMAL MODEL Z THERMAL MODELThe primary protective function of the 469 is the thermal model. It consists of five keyelements: the overload curve and overload pickup level, the unbalance biasing of themotor current while the motor is running, the motor cooling time constants, and thebiasing of the thermal model based on Hot/Cold motor information and measured statortemperature. Each of these elements are described in detail in the sections that follow.The 469 integrates stator and rotor heating into one model. Motor heating is reflected inthe A1 STATUS Z MOTOR STATUS ZV MOTOR THERMAL CAPACITY USED actual value register.If the motor has been stopped for a long period of time, it will be at ambient temperatureTHERMAL [SELECT CURVESTYLE:Range: Standard, Custom, VoltageDependentMESSAGE OVERLOAD PICKUPLEVEL: 1.01 x FLARange: 1.01 to 1.25 in steps of 0.01MESSAGE ASSIGN TRIPRELAYS:Range: Trip, Trip & Aux2, Trip & Aux2 &Aux3, Trip & Aux3MESSAGE UNBALANCE BIASK FACTOR: 0Range: 0 to 19 in steps of 1. (0 defeatsthis feature)MESSAGE COOL TIME CON-STANTRange: 1 to 1000 min. in steps of 1MESSAGE COOL TIME CON-STANTRange: 1 to 1000 min. in steps of 1MESSAGE HOT/COLD SAFESTALL RATIO: 1.00Range: 0.01 to 1.00 in steps of 0.01MESSAGE ENABLE RTDBIASING: NoRange: Yes, NoMESSAGE RTD BIASMINIMUM: 40°CRange: 0°C to RTD BIAS CENTER valuein steps of 1MESSAGE RTD BIAS CENTERPOINT: 130°CRange: RTD BIAS MINIMUM value toRTD BIAS MAXMIMUM valuein steps of 1MESSAGE RTD BIASMAXIMUM: 155°CRange: RTD BIAS CENTER value to250°C in steps of 1MESSAGE THERMAL CAPACITYALARM: OffRange: Off, Latched, UnlatchedMESSAGE ASSIGN ALARMRELAYS:Range: Alarm, Alarm & Auxiliary2,Alarm & Aux2 & Aux3, Alarm &Auxiliary3, Auxiliary2, Aux2 &Aux3, Auxiliary3MESSAGE THERMAL CAP.ALARMRange: 10 to 100% in steps of 1MESSAGE THERMAL CAPACITYALARM EVENTS: OffRange: On, Off
