Delta VFD-BW Series, Руководство пользователя

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Chapter 5 Parameters
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VFD-BW Series
5-54 Revision May 2009, BWE0, SW V1.05
Example 3: Use of bias and gain for use of full range
This example also shows a popular method. The whole scale of the potentiometer can be used as
desired. In addition to signals of 0 to 10V and 4 to 20mA, the popular voltage signals also include
signals of 0 to 5V, 4 to 20mA or any value under 10V. Regarding the setting, please refer to the
following examples.
60Hz
0Hz
0V
4mA
5V
12mA
10V
20mA
Pr.01-00=60Hz--Max. output Freq.
AVI ACI AUI
Pr.04-00 Pr.04-11 Pr.04-15=20.0%--Bias adjustment
Pr.04-01 Pr.04-12 Pr.04-16=0--Positive bias
Pr.04-02 Pr.04-13 Pr.04-17=83.3%--Input gain
Pr.04-03 Pr.04-14 Pr.04-18=0--No negative bias command
Gain:(10V/(10V+2V))*100%=83.3%
Bias adjustment:((10Hz/60Hz)/(Gain/100%))*100%=20.0%
10Hz
Bias
Adjustment
-2V
XV
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 shown in the
example below, you can set Pr. 01-00 to 120Hz to achieve the same results.
Pr.01-00=60Hz--Max. output Freq.
AVI AUI
Pr.04-00 Pr.04-15=0.0%--Bias adjustment
Pr.04-01 Pr.04-16=0--Positive bias
Pr.04-02 Pr.04-17=200%--Input gain
Pr.04-03 Pr.04-18=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.
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