Chapter 4 Parameters

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

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

Negative0Hz

Gain:100%

10V Bias adjustment:((6Hz/60Hz)/(Gain/100%))*100%=10.0%

bias 6Hz

0V 1V

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.

 

 

 

 

 

Bias

 

 

60Hz

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

Negative 0Hz

 

 

 

 

Gain:(10V/9V)*100%=111%

 

 

 

 

 

 

 

 

 

 

 

 

bias 6.6Hz

 

0V

10V

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.

Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11

4-71

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Image 124
Delta Electronics VFD-E manual Example 5 Use of negative bias in noisy environment