Delta Electronics VFD-EL manual 04.11, 04.12, 04.13, 04.14, 04.15, 04.16, 04.17, 04.18

Chapter 4 Parameters

Example 8: Use negative slope

In this example, the use of negative slope is shown. Negative slopes are used in applications for control of pressure, temperature or flow. The sensor that is connected to the input generates a large signal (10V) at high pressure or flow. With negative slope settings, the AC motor drive will slow stop the motor. With these settings the AC motor drive will always run in only one direction (reverse). This can only be changed by exchanging 2 wires to the motor.

60Hz

negative slope

0Hz

0V10V

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

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

Pr.04.03 =1--Negative bias: REV motion enabled

Gain:(10V/10V)*100%=100%

Bias adjustment:((60Hz/60Hz)/(Gain/100%))*100%=100%

04.11	Minimum AVI Voltage		Unit: 0.1
	Settings	0.0 to 10.0V	Factory Setting: 0.0
04.12	Minimum AVI Frequency (percentage of Pr.01.00)		Unit: 0.1
	Settings	0.0 to 100.0%	Factory Setting: 0.0
04.13	Maximum AVI Voltage		Unit: 0.1
	Settings	0.0 to 10.0V	Factory Setting: 10.0
04.14	Maximum AVI Frequency (percentage of Pr. 01.00)		Unit: 0.1
	Settings	0.0 to 100.0%	Factory Setting: 100.0
04.15	Minimum ACI Current		Unit: 0.1
	Settings	0.0 to 20.0mA	Factory Setting: 4.0
04.16	Minimum ACI Frequency (percentage of Pr. 01.00)		Unit: 0.1
	Settings	0.0 to 100.0%	Factory Setting: 0.0
04.17	Maximum ACI Current		Unit: 0.1
	Settings	0.0 to 20.0mA	Factory Setting: 20.0
04.18	Maximum ACI Frequency (percentage of Pr. 01.00)		Unit: 0.1
	Settings	0.0 to 100.0%	Factory Setting: 100.0

The above parameters are used to set the analog input reference values. The min and max frequencies are based on Pr.01.00 (during open-loop control) as shown in the following.

4-56 Revision August 2008, 2ELE, V1.02