Yaskawa F7 Drive Programming Manual - Manual (Page 49)

Programming 41
d2-03 Master Speed Reference Lower Limit
Setting Range: 0.0 to 110.0%
Factory Default: 0.0%
Unlike Frequency Reference Lower Limit (d2-02) which will affect the frequency reference no matter where it is sourced from
(i.e. analog input, preset speed, jog speed, etc.), the Master Speed Reference Lower Limit (d2-03) sets a low speed threshold
that will only affect the analog input (terminals A1, A2, and A3) that is the active master speed frequency. This parameter
allows a minimum speed to be programmed for the master reference while allowing a lower speed to be set as a jog reference.
If the frequency referenced by the active master speed frequency is below the setting of d2-03, then the Drive will operate at
the speed specified by d2-03.
d3 Jump Frequencies
d3-01 Jump Frequency 1
d3-02 Jump Frequency 2
d3-03 Jump Frequency 3
Setting Range: 0.0 to 200.0 Hz
Factory Default: 0.0 Hz
d3-04 Jump Frequency Width
Setting Range: 0.0 to 20.0 Hz
Factory Default: 1.0 Hz
In order to avoid continuous operation at a speed that causes resonance in driven machinery, the Drive can be programmed
with jump frequencies that will not allow continued operation within specific frequency ranges. If a speed is commanded that
falls within a dead band, or Jump Frequency, the Drive will clamp the frequency reference just below the dead band and only
accelerate past it when the commanded speed rises above the upper end of the dead band, for increasing references. Similarly,
the Drive will clamp the frequency reference just above the dead band and only decelerate past it when the command speed
falls below the lower end of the dead band, for decreasing references.
Fig. 33 Jump Frequency Characteristics
Setting the center point of the dead band with the d3-01 through d3-03 parameters and setting the width of the dead band with
parameter d3-04 determine the dead band characteristics. The programmer can set up to three Jump Frequencies. If multiple
Jump Frequencies are programmed the following rule applies:
User Frequency
Reference
Output
F
re
quency
d3-01
d3-02
d3-04
d3-04
d3-04
d3-03
d3-03
d3-04
d3-04
d 3-01 ≤ d3-02 ≤ d3-03