Delta VFD-B Series - Page 114

Chapter 5 Parameters|VFD-B-P Series
Revision April 2009, SW V1.00 5-49
04 - 18 AUI Negative Bias, Reverse Motion Enable/Disable
Factory Setting: 00
Settings 00 No AUI Negative Bias Command
01 Negative Bias: REV Motion Enabled
02 Negative Bias: REV Motion Disabled
 In a noisy environment, it is advantageous to use negative bias to provide a noise margin. It is
recommended NOT to use the signal under 1V to set the operation frequency of the AC motor
drive in the bad application environment.
 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 or 02 (setting 01 and 02 are
used with the external terminals to set the frequency by the potentiometer on the keypad or
potentiometer/current signal of the external terminal.
Max.
Output
Freq.
60Hz
Pr.01-00
0Hz
0V
4mA
5V
12mA
10V
20mA
Factory Settings
Pr.01-00=60Hz--Max. output Freq.
Pr.04-11=0%--bias adjustment
Pr.04-12 =0-- bias polarity
Pr.04-13=100% -- pot. freq. gain
Pr.04-14=0 -- REV disable in negative bias
30Hz
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.