User Manual EM303B General Purpose Inverter Current limit control FC-07 =0 Disabled FC-07 =1 Not used FC-07 =2 Enabled In the process of operation, when the current of motor which is on load reaches overcurrent stall current (Set by FC-08), if overcurrent stall protection mode is enabled, system will start overcurrent stall protection , it will lower output frequency for limiting the rising output current, enable inverter runs at overcurrent stall status. When output current drops and is less than overcurrent stall current, inverter return previous running status. See Figure 7-33 for overcurrent stall enabling process.
Time(S) Stall Current Point Time(S) Figure 7-33 Overcurrent Stall Enabling Process Overcurrent stall is only enabled in V/F control mode. It is recommended for the applications with big inertia, fans, or multi-motor driven by single-inverter. 8.13.5 Overcurrent Stall Current FC-08 is for setting overcurrent stall current. If the output current of inverter> the setting value of FC-08, the overcurrent stall control is enabled for controlling the output current setting value of FC-08. FC-08 refers to the ratio of output current to the rated output current of inverter. Users can set overcurrent stall current to protect motor or to meet application requirements.
8.13.6 Current Limit Coefficient of Weak Flux FC-09 is applied to limit inverter’s output current when the motor is operating in flux weakening, to ensure the best output power when the motor accelerates or decelerates in flux weakening. 8.13.7 Overcurrent Stall Parameters FC-21 and FC-31 are the auto-regulation parameters of internal overvoltage protection. They are used for after-sales regulation. The defaults can meet most of application needs. 148 FC-21 Overcurrent Stall Proportion Gain IKp 0.00～100.00 0.10 〇 FC-31 Integral Time of Overcurrent Stall 0.00～300.00 mS 20.00 〇 Output Frequency T Sta Output Current (%) Output Current (%)