No. (Hex.) Name Description Default (Range) b1-05 (0184) Operation Below Minimum Freq Sets the drive operation when the frequency reference decreases to less than the value set in E1-09 [Minimum Output Frequency]. 0 (0 - 3) 0 Operate at Frequency Reference When the frequency reference is less than the value set in E1-09, the drive will continue to operate the motor as specified by the frequency reference. If the motor speed is less than or equal to the value set in b2-01 [DC Injection/Zero SpeedThreshold] when you enter the Stop command (or deactivate the Run command), the drive will do Zero Speed Control for the time set in b2-04 [DC Inject Braking Time at Stop] and then turn OFF its output. Figure 1. Operate at the Frequency Reference 1 Baseblock (Motor Coasts) If the frequency reference is less than the value set in E1-09, the drive stops motor voltage output and the motor coasts to stop. If the motor speed is less than or equal to the value set in b2-01, the drive will do Zero Speed Control for the time set in b2-04. Figure 2. Coast to Stop 2 Operate at Minimum Frequency The drive operates the motor at the minimum frequency reference set in E1-09 when the frequency reference falls below the value set in E1-09 and the Run command is still enabled. The drive decelerates the motor when the Stop command is entered (or when the Run command is switched OFF). If the motor speed falls below or is equal to the value set in b2-01, then the drive will perform Zero Speed Control for the time set in b2-04. Figure 3. Operate at Minimum Frequency 3 Operate at Zero Speed The drive performs Zero Speed Control when the frequency reference falls below the value set in E1-09. When you enter the Stop command (or when you turn OFF the Run command), the drive does Zero Speed Control again for the time set in b2-04. Figure 4. Operate at Zero Speed
