User Manual EM303B General Purpose Inverter In torque control mode, the inverter controls the torque current of motor, so the motor speed is beyond control. If the input torque command does not match the load, the motor may accelerate or accelerate in opposite direction continuously. F5-14 is to limit the motor speed threshold in torque control mode. When the motor reaches the speed threshold, torque current is determined by the load torque, but beyond control of the torque current setting value, i.e. the speed will not rise and remain the threshold. If motor speed drops, the torque current will be controlled by setting value again. F5-14=0 Defined by upper limit frequency (F0-17).
F5-14=1 Defined by VS* upper limit frequency. F5-14=2 Defined by IS *upper limit frequency. F5-14=3 Defined by VF*upper limit frequency. F5-14=4 Defined by IF*upper limit frequency. The analog signal here means gain. Gain value= Voltage/10*100% or current/20* 100%. In torque mode, the system with large inertia or static friction coefficient generally requires sufficient torque to get a start. The torque compensation against static friction can be acquired by F5-15 and F5-17 together. Static friction coefficient refers to the additional torque value in normal torque setting. Starting torque can be regulated by this code.
After estimated frequency reaches at static friction acting cut-off frequency, static friction compensation is out of effect, and the motor runs as per normal torque setting. F5-20 and F5-21 are the parameters of vector control excitation current regulator, and will affect system performance and stability directly. User does not need to change the defaults on general conditions. 119 No. Function Range Unit Default Type F5-15 Static friction compensation coefficient 0.00～150.00 % 0 ● F5-17 Static friction acting cut-off frequency 0.00～50.00 Hz 2.00 〇 No.
Function Range Unit Default Type F5-20 Gain of VVF Excitation Current Regulation 0～60000 0 ● F5-21 Integral Time of VVF Excitation Current Regulation 0.00～600.00 mS 0.00 ● No. Function Range Unit Default Type Positive/Negative Torque Control 0: Positive/Negative Torque Permitted 1: Negative Torque Prohibited 0 〇 F5-22 Positive/Negative Torque Deadband Time 0.00～600.00 S 0.00 〇 F5-23