Chapter 5 Parameters
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VFD-B Series
Revision July 2008, BE16, SW V4.08 & V5.00
5-51
60Hz
0Hz
0V
10V
Pr.01-00=60Hz--Max. output Freq.
AVI AUI
Pr.04-00 Pr.04-15=10.0%--Bias adjustment
Pr.04-01 Pr.04-16=1--Negative bias
Pr.04-02 Pr.04-17=100%--Input gain
Pr.04-03 Pr.04-18=0--No negative bias command
Gain:100%
Bias adjustment:((6Hz/60Hz)/(Gain/100%))*100%=10.0%
Negative
bias 6Hz
1V
54Hz
Example 6: Use of negative bias in noisy environment and gain adjustment to use full
potentiometer range
In this example, a negative bias is used to provide a noise margin. Also a potentiometer frequency
gain is used to allow the Maximum Output Frequency to be reached.
60Hz
0Hz
0V
10V
Pr.01-00=60Hz--Max. output Freq.
Negative
bias 6.6Hz
1V
Bias
adjustment
AVI AUI
Pr.04-00 Pr.04-15=10.0%--Bias adjustment
Pr.04-01 Pr.04-16=1--Negative bias
Pr.04-02 Pr.04-17=111%--Input gain
Pr.04-03 Pr.04-18=0--No negative bias command
Gain:(10V/9V)*100%=111%
Bias adjustment:((6.6Hz/60Hz)/(Gain/100%))*100%=10.0%
Example 7: Use of 0-10V potentiometer signal to run motor in FWD and REV direction
In this example, the input is programmed to run a motor in both forward and reverse direction. The
motor will be idle when the potentiometer position is at mid-point of its scale. Using this example will
disable the external FWD and REV controls.
Pr.01-00=60Hz--Max. output Freq.
AVI AUI
Pr.04-00 Pr.04-15=50.0%--Bias adjustment
Pr.04-01 Pr.04-16=1--Negative bias
Pr.04-02 Pr.04-17=200%--Input gain
Pr.04-03 Pr.04-18=1--Negative bias: REV motion enabled
Gain:(10V/5V)*100%=200%
Bias adjustment:((60Hz/60Hz)/(Gain/100%))*100%=200%
60Hz
30Hz
0Hz
0V
5V
10V
30Hz
60Hz
REV
FWD
