CHAPTER 5: SETTINGS469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–85Before torque can be determined, the motor stator resistance and number of pole pairsmust be entered here. The base stator resistance can be determined from the motor’srated voltage and current. Torque metering is intended for induction motors only, and onlypositive torque is calculated. Please consult the motor specifications for the statorresistance and the pole pairs.The default unit for torque is the SI unit of Newton-meter (Nm). The torque unit is selectableto either Newton-meter or foot-pound.Note1 Nm = 0.738 ft·lb.5.11.7 OvertorquePATH: SETTINGS ZV S10 POWER ELEMENTS ZV OVERTORQUEDetection of a motor overtorque condition, usually done to protect devices driven by themotor, can be set up here. The assigned relay activates when the torque measuredexceeds the specified level for the specified time duration.OVERTORQUE [OVERTORQUEALARM: OffRange: Off, Latched, UnlatchedMESSAGE ASSIGN ALARMRELAYS:Range: Alarm, Alarm & Auxiliary2,Alarm & Aux2 & Aux3, Alarm &Auxiliary3, Auxiliary2, Aux2 &Aux3, Auxiliary3MESSAGE TORQUE ALARMLEVEL: 4000.0 NmRange: 0.1 to 999999.9 Nm (or ft·lb) insteps of 0.1MESSAGE TORQUE ALARMDELAY: 1.0 sRange: 0.2 to 30 s in steps of 0.1MESSAGE TORQUE ALARMEVENTS: OffRange: On, Off
