Yaskawa iQpump Controller Programming Manual - Manual (Page 50)

50 YASKAWA TM.iQp.07 iQpump Controller Programming Manual
d3 Jump Frequencies
◆ Jump Frequencies
Setting Range: 0.0 ~ 200.0 Hz
Factory Default: 0.0 Hz
◆ d3-04 Jump Frequency Width
Setting Range: 0.0 ~ 20.0 Hz
Factory Default: 1.0 Hz
In order to avoid continuous operation at a speed that causes resonance in driven machinery, the iQpump 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 iQpump drive will clamp the frequency reference just below the dead band and only accept higher
speed commands when the commanded speed rises above the upper end of the dead band, for increasing references. Similarly, the
iQpump drive will clamp the frequency reference just above the dead band and only accept lower speed commands when the command
speed falls below the lower end of the dead band, for decreasing references.
Figure 1.37
Figure 37. 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 determines the dead band characteristics. The programmer can set up to three Jump Frequencies. If multiple Jump Frequencies are
programmed the following rule applies:
d3-01 < = d3-02 < = d3-03
Parameter No. Parameter Name
d3-01 Jump Frequency 1
d3-02 Jump Frequency 2
d3-03 Jump Frequency 3
User Speed
Command Input
Accepted
S
peed
Comm
a
nd
d3-01
d3-02
d3-04
d3-04
d3-04
d3-03
d3-03
d3-04
d3-04