Example: Use Of Negative Bias In Noisy Environment; Example: Use Of Negative Bias In Noisy Environment And Gain Adjustment To Use Full Potentiometer Range; Example: Use Of 0-10V Potentiometer Signal To Run Motor In Fwd And Rev Direction - Delta Electronics AC Motor Drive VFD-E User Manual

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
54Hz
0Hz
Negative
0V
1V
bias 6Hz
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
Negative
0V
1V
bias 6.6Hz
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.
Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11
Pr.01.00=60Hz--Max. output Freq.
Potentiometer
Pr.04.00
Pr.04.01
Pr.04.02
Pr.04.03
Gain:100%
10V
Bias adjustment:((6Hz/60Hz)/(Gain/100%))*100%=10.0%
Bias
adjustment
Pr.01.00=60Hz--Max. output Freq.
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%
10V Bias adjustment:((6.6Hz/60Hz)/(Gain/100%))*100%=10.0%
Chapter 4 Parameters|
=10.0%--Bias adjustment
=1--Negative bias
=100%--Input gain
=0--No negative bias command
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