Yaskawa iQpump Drive User Manual - Manual (Page 104)

5.1 iQpump Basic Programming Parameters
104 YASKAWA TM.iQp.01 iQpump Drive User Manual
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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 speed command 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 that is the active master speed frequency (as determined by parameter H3-13 and H3-09). 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 speed commanded by
the active master speed frequency is below the setting of d2-03, then the iQpump drive will operate at the speed specified by d2-03.
◆ d3 Jump Frequencies
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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
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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 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 5.16
Figure 5.19 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
User Speed
Command Input
Accepted Speed
Command
d3-01
d3-02
d3-04
d3-04
d3-04
d3-03
d3-03
d3-04
d3-04