5.4 d: Reference Settings u d3: Jump Frequency n d3-01, d3-02, d3-04 : Jump Frequencies 1, 2, and Jump Frequency Width In order to avoid continuous operation at a speed that causes resonance in driven machinery, the drive can be programmed with three separate Jump frequencies that will not allow continued operation within specific frequency ranges. If the speed reference falls within a Jump frequency dead band, the drive will clamp the frequency reference just below the dead band and only accelerate past it when the frequency reference rises above the upper end of the dead band. Setting parameters d3-01 and d3-02 to 0.0 Hz disables the Jump frequency function.
Figure 5.11 shows the relationship between the Jump frequency and the output frequency. Output frequency Frequency reference decreases Frequency reference increases Jump Frequency Width d3-04 Jump Frequency Width d3-04 Frequency reference Jump Frequency 1 d3-01 Jump Frequency 2 d3-02 Figure 5.11 Jump Frequency Operation Note: 1. The drive will use the active accel/decel time to pass through the specified dead band range but will not allow continuous operation in that range. 2. When using more than one Jump frequency, make sure that d3-01 ≥ d3-02. u d4: Frequency Hold Function n d4-01:
Frequency Reference Hold Function Selection This parameter is effective when either of the digital input functions listed below is used. • Accel/decel ramp hold function (H1- = A) • Up/Down function (H1- = 10 and 11, sets the frequency reference by digital inputs) Parameter d4-01 determines whether the frequency reference value is saved when the Run command is cleared or the power supply is shut down. The operation depends on with what function parameter d4-01 is used. Setting 0: Disabled • Acceleration Hold The hold value will be reset to 0 Hz when the Run command is canceled or the drive power is switched off.
The active frequency reference will be the value the drive uses when it restarts. • Up/Down 84 SIEP C710606 33A OYMC AC Drive – J1000 User Manual No. Parameter Name Setting Range Default d3-01 Jump Frequency 1 0.0 to 400.0 Hz 0.0 Hz d3-02 Jump Frequency 2 0.0 to 400.0 Hz 0.0 Hz d3-04 Jump Frequency Width 0.0 to 20.0 Hz 1.0 Hz No. Parameter Name Setting Range Default d4-01 Frequency Reference Hold Function Selection 0 or 1 0