Chapter 5 Parameters|VFD-B Series

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 or 20mA) 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

Pr.01-00=60Hz--Max. output Freq.

AVI

ACI

AUI

Pr.04-00 Pr.04-11 Pr.04-15=100%--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=1--Negative bias: REV motion enabled

0Hz

0V

4mA

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

10V Bias adjustment:((60Hz/60Hz)/(Gain/100%))*100%=100%

20mA

04 - 19 AVI Analog Input Delay

Settings

0.00 to 10.00 sec

04 - 20 ACI Analog Input Delay

Settings

0.00 to 10.00 sec

04 - 21 AUI Analog Input Delay

Settings

0.00 to 10.00 sec

These input delays can be used to filter noisy analog signals.

Unit: 0.01

Factory Setting: 0.05

Unit: 0.01

Factory Setting: 0.05

Unit: 0.01

Factory Setting: 0.05

04 - 22 Analog Input Frequency Resolution

Settings

00 0.01Hz

01 0.1Hz

Factory Setting: 01

It is used to set the unit of the resolution of frequency command when the input source is an

analog signal.

5-52

Revision July 2008, BE16, SW V4.08 & V5.00