Chapter 5 Parameters
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VFD-BW Series
Revision May 2009, BWE0, SW V1.05
5-55
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
Example 8: Use negative slope
In this example, the use of negative slope is shown. Negative slopes are used in applications for
control of pressure, temperature or flow. The sensor that is connected to the input generates a large
signal (10V or 20mA) at high pressure or flow. With negative slope settings, the AC motor drive will
slow stop the motor. With these settings the AC motor drive will always run in only one direction
(reverse). This can only be changed by exchanging 2 wires to the motor.
Summary of Contents for VFD-BW Series
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Page 222: ...Appendix B Accessories VFD BW Series Revision May 2009 BWE0 SW V1 05 B 15 Order P N 150TDS84C ...