User Manual EM303B General Purpose Inverter F0-19=0 Start as per setting mode: Zero speed start, or DC brake first, and then zero speed start. F0-19=1 Speed search start: Before inverter starts, the motor may be rotating. Detecting motor speed and direction when inverter starts running, the speed and running direction of motor can be directly searched base on the detection result. Smooth start can be applied to the motor which is rotating. The process of speed search is as shown in Figure 7-5. Power Supply Motor Speed Output Frequency Variable 0 0 Negative Frequency Time Figure7-5 Speed Search Start Motor Speed and Direction Detection 1.
Load inertia shall be taken into consideration when increasing the setting value of acceleration/deceleration time in speed search start mode. 2. Speed search start mode is applicable to the occasion when one inverter drives one motor, especially practical for industrial dryer. Due to the grid power outage or accidental fault of inverter, the industrial dryer will rotate freely for a long time. Speed search start can ensure that the industrial dryer returns normal work as short as possible. Before inverter starts, the motor may run at low speed or in opposite rotation status. If inverter starts immediately at mean time, overcurrent may occur.
In order to avoid such fault, before inverter starts, please start DC brake to stop motor, and then the inverter runs to setting frequency as per setting direction. See F3-22 ， F3-23 for the setting method of starting DC brake. Stop Mode Setting: Ramp to Stop F0-20=0 Motor is ramp-to-stop in setting deceleration time. 【 Default is F0-10 Deceleration Time 1 】 Coast to Stop F0-20=1 While the stop command is input, inverter stops output immediately, and the motor coasts to stop. The stop time is up to load inertia.
If there is a coast-to-stop terminal and when it is on, the inverter enters coast-to-stop status immediately, and when it is off, the inverter will not restart only if giving the run command again. 89 On Reverse No. Function Range Unit Default Type Stop Mode Options 0: Ramp to stop 1: Coast to stop 0 〇 F0-20 No. Function Range Unit Default Type ＋J ／OG － Function Setting 0: Jog running 1: Positive/Negative input switching 2: Disabled 0 〇 F0-21 JOG ＋／－