Delta Electronics VFD-EL Group 4 Input Function Parameters, 04.00, 04.02, Example 2 Use of bias

			Chapter 4 Parameters
Group 4: Input Function Parameters
04.00	Keypad Potentiometer Bias		Unit: 0. 1
	Settings	0.0 to 100.0%	Factory Setting: 0.0

04.01Keypad Potentiometer Bias Polarity

				Factory Setting: 0
	Settings	0	Positive Bias
		1	Negative Bias
04.02	Keypad Potentiometer Gain			Unit: 0.1
	Settings	0.1 to 200.0%		Factory Setting: 100.0

04.03Keypad Potentiometer Negative Bias, Reverse Motion Enable/Disable

Factory Setting: 0

Settings	0	No Negative Bias Command
	1	Negative Bias: REV Motion Enabled

Example 1: Standard application

This is the most used setting. The user only needs to set Pr.02.00 to 04. The frequency command comes from keypad potentiometer.

60Hz

30Hz

0Hz

0V 5V 10V

Example 2: Use of bias

Pr.01.00=60Hz--Max. output Freq. Potentiometer

Pr.04.00 =0%--Bias adjustment Pr.04.01 =0--Positive bias Pr.04.02 =100%--Input gain

Pr.04.03 =0--No negative bias command

This example shows the influence of changing the bias. When the input is 0V 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 corresponds to the setting frequency 10-60Hz.

Revision August 2008, 2ELE, V1.02 4-53