Delta VFD185B43A User Manual

Chapter 5 Parameters_VFD-B Series
Revision 10/2005, BE13, SW V4.08 5-55
Example 2: Use of bias
This example shows the influence of changing the bias. When the input is 0V (4mA) the output frequency is 10
Hz. At mid-point a potentiometer will give 40 Hz. Once the Maximum Output Frequency is reached, any further
increase of the potentiometer or signal will not increase the output frequency. (To use the full potentiometer
range, please refer to Example 3.) The value of external input voltage/current 0-8.33V (4-17.33mA) corresponds
to the setting frequency 10-60Hz.
60Hz
0Hz
0V
4m
A
5V
12m
A
10V
20m
A
Pr.01-00=60Hz--Max. output Freq.
AVI ACI AUI
Pr.04-00 Pr.04-11 Pr.04-15=16.7%--Bias adjustment
Pr.04-01 Pr.04-12 Pr.04-16=0--Positive bias
Pr.04-02 Pr.04-13 Pr.04-17=100%--Input gain
Pr.04-03 Pr.04-14 Pr.04-18=0--No negative bias command
Gain:100%
Bias adjustment:((10Hz/60Hz)/(Gain/100%))*100%=16.7%
10Hz
Bias
Adjustment
40Hz
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

Delta VFD185B43A Specifications

General

Brand	Delta
Model	VFD185B43A
Category	DC Drives
Language	English