5.8 L: Protection FunctionsYASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 291Parameter Details5 L5-05: Fault Reset Operation SelectionSetting 0: Count successful restartsThe drive will continuously attempt to restart. If it restarts successfully, the restart counter is increased. This operation isrepeated each time a fault occurs until the counter reaches the value set in L5-01.Setting 1: Count restart attemptsThe drive will try to restart using the time interval set in parameter L5-04. A record is kept of the number of attempts torestart to the drive, regardless of whether or not those attempts were successful. When the number of attempted restartsexceeds the value set to L5-01, the drive gives up trying to restart. L6: Torque DetectionThe drive provides two independent torque detection functions that trigger an alarm or fault signal when the load is tooheavy (oL), or suddenly drops (UL). They are set up using the L6- parameters. To indicate the underload or overloadcondition to an external device, digital outputs should be programmed as shown below.Note: When overtorque occurs in the application, the drive may stop due to overcurrent (oC) or overload (oL1). To prevent this, anoverload situation should be indicated to the controller before oC or oL1 occur in the drive. Use the torque detection for thispurpose. Use undertorque detection to discover application problems like a torn belt, a pump shutting off, or other similartrouble.Figure 5.106 and Figure 5.107 show the function of overtorque and undertorque detection.Figure 5.106Figure 5.106 Overtorque Detection OperationFigure 5.107Figure 5.107 Undertorque Detection OperationNote: 1. The torque detection function uses a hysteresis of 10% of the drive rated output current and motor rated torque.2. In V/f, V/f w/PG and OLV/PM, the level is set as a percentage of the drive rated output current. In OLV, CLV, AOLV/PM and CLV/PM, it is set as a percentage of the motor rated torque.No. Name Setting Range DefaultL5-05 Fault Reset Operation Selection 0 or 1 0H2-01, H2-02, H2-03Setting DescriptionB Torque detection 1, N.O. (output closes when overload or underload is detected)17 Torque detection 1, N.C. (output opens when overload or underload is detected18 Torque detection 2, N.O. (output close when overload or underload is detected)19 Torque detection 2, N.C. (output opens when overload or underload is detected)Motor current / torqueL6-02/0510 % hysteresisTorque detection 1 (NO)orTorque detection 2 (NO)L6-03/06ONL6-03/0610 % hysteresisONMotor current / torqueL6-02/0510 % hysteresisTorque detection 1 (NO)orTorque detection 2 (NO)L6-03/06ONL6-03/06ON
