Use Negative Slope - Delta Electronics AC Motor Drive VFD-EL User Manual

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
0V
04.11 Minimum AVI Voltage
Settings
04.12 Minimum AVI Frequency (percentage of Pr.01.00)
Settings
04.13 Maximum AVI Voltage
Settings
04.14 Maximum AVI Frequency (percentage of Pr. 01.00)
Settings
04.15 Minimum ACI Current
Settings
04.16 Minimum ACI Frequency (percentage of Pr. 01.00)
Settings
04.17 Maximum ACI Current
Settings
04.18 Maximum ACI Frequency (percentage of Pr. 01.00)
Settings
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
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%
10V
Bias adjustment:((60Hz/60Hz)/(Gain/100%))*100%=100%
0.0 to 10.0V
0.0 to 100.0%
0.0 to 10.0V
0.0 to 100.0%
0.0 to 20.0mA
0.0 to 100.0%
0.0 to 20.0mA
0.0 to 100.0%
Factory Setting: 0.0
Factory Setting: 0.0
Factory Setting: 10.0
Factory Setting: 100.0
Factory Setting: 4.0
Factory Setting: 0.0
Factory Setting: 20.0
Factory Setting: 100.0
Revision August 2008, 2ELE, V1.02
Unit: 0.1
Unit: 0.1
Unit: 0.1
Unit: 0.1
Unit: 0.1
Unit: 0.1
Unit: 0.1
Unit: 0.1