Delta Electronics VFD-EL series - Use of 0-5 V Potentiometer Range Via Gain Adjustment; Use of Negative Bias in Noisy Environment; Use of Negative Bias in Noisy Environment and Gain Adjustment; Use of 0-10 V Potentiometer Signal to Run Motor in FWD;REV Direction

Revision 2016/03, 6ELE, V1.14
4-49
Example 4: Use of 0-5V potentiometer range via gain adjustment
This example shows a potentiometer range of 0 to 5 Volts. Instead of adjusting gain as example below, you can set
Pr. 01.00 to 120Hz to achieve the same results.
Pr.01.00=60Hz--Max. output Freq.
Potentiometer
Pr.04.00 =0.0%--Bias adjustment
Pr.04.01 =0--Positive bias
Pr.04.02 =200%--Input gain
Pr.04.03 =0--No negative bias command
Gain:(10V/5V)*100%=200%
60Hz
0Hz
0V
5V
30Hz
Gain
adjustment
10V
Example 5: Use of negative bias in noisy environment
In this example, a 1V negative bias is used. In noisy environments it is advantageous to use negative bias to
provide a noise margin (1V in this example).
60Hz
0Hz
0V
10V
Pr.01.00=60Hz--Max. output Freq.
Potentiometer
Pr.04.00 =10.0%--Bias adjustment
Pr.04.01 =1--Negative bias
Pr.04.02 =100%--Input gain
Pr.04.03 =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
Potentiometer
Pr.04.00 =10.0%--Bias adjustment
Pr.04.01 =1--Negative bias
Pr.04.02 =111%--Input gain
Pr.04.03 =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 the settings in this example disables the
external FWD and REV controls.
Pr.01.00=60Hz--Max. output Freq.
Potentiometer
Pr.04.00 =50.0%--Bias adjustment
Pr.04.01 =1--Negative bias
Pr.04.02 =200%--Input gain
Pr.04.03 =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