12.9 L: Protection Functions700 YASKAWA SIEPC71061753A GA500 Technical Manual■ L6-11: Mech Fatigue Hold Off TimeNo.(Hex.) Name Description Default(Range)L6-11(046B)Mech Fatigue Hold OffTime Sets the time that the drive will start mechanical deterioration detection triggered by thecumulative operation time of the drive.0 h(0 - 65535 h)When the total operation time of the drive is more than the value set in L6-11, the drive will detect mechanicalweakening. Use U4-01 [Cumulative Ope Time] to monitor the drive total operation time.◆ L7: Torque LimitThe torque limit function limits the internal torque reference for the drive to and keeps the torque from the motorconstant. This function limits the torque applied to loads and regenerative torque to a value less than a setquantity. This function also prevents damage to machinery and increases the reliability of continuous operation.You can set torque limits individually for the four quadrants, which include torque direction (motoring/regeneration) and direction of motor rotation (forward/reverse). When the torque reference value is at the settorque limit, the MFDO terminal set for During Torque Limit [H2-xx = 30] activates.Note:• The drive output current limits maximum output torque. The drive limits torque to 150% of the rated output current for Heavy DutyRating (HD) and to 110% of the rated output current for Normal Duty Rating (ND). The actual output torque is not more than the limitsof the drive rated output current when you set the torque limit to a high value.• When you use torque limits for lifting applications, do not lower the torque limit value too much. When the torque limit function istriggered, falls and rollbacks can occur because of sudden acceleration stops and stalls of the motor.■ Configuring SettingsUse one of these methods to set torque limits:• Individually set the four torque limit quadrants using L7-01 to L7-04 [Torque Limit].• Use MFAI to individually set the four torque limit quadrants. Set H3-02, H3-10 = 10, 11, 12 [MFAI FunctionSelect = Forward Torque Limit, Reverse Torque Limit, Regenerative Torque Limit].• Use MFAI to set all four torque limit quadrants together. Set H3-02, H3-10 = 15 [General Torque Limit].• Use a communication option to set all four torque limit quadrants together.Figure 12.127 shows the configuration method for each quadrant.Figure 12.127 Torque Limits and Analog Input Setting ParametersNote:• When L7-01 to L7-04 and analog inputs or communication option torque limits set torque limits for the same quadrant, the driveenables the lowest value.In this example of parameter settings, the torque limit for quadrant 1 is 130% and the torque limit for quadrants 2, 3, and 4 is 150%.Settings: L7-01 = 130%, L7-02 to L7-04 = 200%, and MFAI torque limit = 150%• The drive output current limits maximum output torque. The torque limit is 150% of the rated output current for HD and to 120% ofthe rated output current for ND. The actual output torque is not more than the limits of the drive rated output current when you set thetorque limit to a high value.V/f OLV OLV/PMOLV/PM AOLV/PM EZOLV
