5.7 L: Protection Functions u L6: Torque Detection The drive provides a torque detection function that triggers an alarm or fault signal when the load is too heavy (oL). It is set up using the L6- parameters. To indicate an overload condition to an external device, the digital output should be programmed as shown below. Figure 5.39 shows the function of overtorque detection. Motor current / torque L6-02 Torque detection (NO) Figure 5.39 Overtorque Detection Operation Note: The torque detection function uses a hysteresis of 10% of the drive rated output current/motor rated torque. Note: When overtorque occurs in the application, the drive may stop due to overcurrent (oC) or overload (oL1).
To prevent this, an overload situation should be indicated to the controller before oC or oL1 occur in the drive. Use the torque detection for this purpose. n L6-01: Torque Detection Selection The torque detection function is triggered when the current/torque exceeds the levels set in parameter L6-02 for longer than the time set in L6-03. The parameters L6-01 select the detection condition and the operation at detection. Setting 0: Disabled Setting 1: oL3 at Speed Agree - Alarm Overtorque detection is active only when the output speed is equal to the frequency reference, i.e., no detection during acceleration and deceleration.
The operation continues after detection and an oL3 alarm is triggered. Setting 2: oL3 at Run - Alarm Overtorque detection works whenever a Run command is active. The operation continues after detection and an oL3 alarm is triggered. Setting 3: oL3 at Speed Agree - Fault Overtorque detection is active only when the output speed is equal to the frequency reference, i.e., no detection during acceleration and deceleration. The operation is stopped and an oL3 fault is triggered. Setting 4: oL3 at Run - Fault Overtorque detection works whenever a Run command is active. The operation is stopped and an oL3 fault is triggered. n L6-02:
Torque Detection Level These parameters the detection levels for the torque detection function. n L6-03: Torque Detection Time These parameters set the time that the levels set in L6-02 have to be exceeded before an alarm/fault is triggered. 108 SIEP C710606 33A OYMC AC Drive – J1000 User Manual H2-01 Setting Description B Torque detection 1, N.O. (output close when overload is detected) 17 Torque detection 1, N.C. (output opens when overload is detected) 10 % hysteresis 10 % hysteresis L6-03 ON L6-03 ON ON ON No. Name Setting Range Default L6-01 Torque Detection Selection 0 to 4 0 No. Name Setting Range Default L6-02 Torque Detection Level 0 to 300% 150% No.
Name Setting Range Default L6-03 Torque Detection time 0.0 to 10.0 s 0.1 s