User Manual EM303B General Purpose Inverter F3-28=0 If output frequency limit frequency. The lower limit frequency is set by F0-18. F3-28=1 If output frequency frequency first, and then runs at zero speed after the lower limit frequency running time reaches the setting value of F3-29. The function is applicable to process PID control like constant pressure water supply, air compressor, and etc. See Figure 7-12 for lower limit frequency control.
Output Frequency(Hz) Output Frequency(Hz) Lower Limit Frequency Lower Limit Frequency Time(S) Time(S) Running Time of Lower Limit Frequency F3-28=0 F3-28=1 109 Output Frequency(Hz) Output Frequency(Hz) Time(S) 0 Motor Speed Time(S) DC Brake Start Frequency 0 t DC Brake Waiting Time Time（S） Brake Voltage/Current t Brake Time T Time(S) 0 Figure 7-10 DC Brake Process at Start Figure 7-11 DC Brake Process at Stop No. Function Range Uni t Default Type Lower Limit Frequency Control 0: R un as per the lower limit 0 〇 frequency 1: Run at zero speed after lower limit frequency running time is up. F3-28 Lower Limit Frequency Running Time 0.00～600.00 S 60.00 〇 F3-29