Aui Negative Bias, Reverse Motion Enable/Disable; Standard Application; Use Of Bias - Delta VFD-B User Manual

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AUI Negative Bias, Reverse Motion Enable/Disable

Settings
In a noisy environment, it is advantageous to use negative bias to provide a noise margin.
Pr.04-00 ~ 04-03, Pr.04-11 ~ 04-18 are used when the source of frequency command is the
analog signal. Refer to the following examples.
Example 1: Standard application
This is the most used setting. The user only needs to set Pr.02-00 to 01, 02 or 03. The frequency
command comes from external potentiometer/current signal on AVI, ACI or AUI.
60Hz
30Hz
0Hz
0V
5V
4mA
12mA
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
40Hz
10Hz
Bias
Adjustment
0Hz 0V
4mA
Revision July 2008, BE16, SW V4.08 & V5.00
00 No AUI Negative Bias Command
01 Negative Bias: REV Motion Enabled
02 Negative Bias: REV Motion Disabled
Pr.01-00=60Hz--Max. output Freq.
AVI
Pr.04-00 Pr.04-11 Pr.04-15=0%--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=0No negative bias command
10V
20mA
Pr.01-00=60Hz--Max. output Freq.
AVI
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%
10V
5V Bias adjustment:((10Hz/60Hz)/(Gain/100%))*100%=16.7%
20mA
12mA
ACI AUI
ACI AUI
Chapter 5 Parameters|VFD-B Series
Factory Setting: 00
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