Delta VFD-L-I Series, User Manual

Page: 43 / 100

Chapter 4 Parameters
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VFD-L-I Series
4-22 Revision July 2009, SW V1.1
Group 4: Input Function Parameters
04-00 Potentiometer Bias Frequency Unit: 0.01Hz
Settings 0.00 to 350.00Hz Factory Setting: 0.00
04-01 Potentiometer Bias Polarity
Factory Setting: 0
Settings 0 Positive Bias
1 Negative Bias
04-02 Potentiometer Frequency Gain Unit: 1
Settings 1 to 200% Factory Setting: 100
04-03 Potentiometer Reverse Motion Enable
Factory Setting: 0
Settings 0 No Function
1 Reverse Motion enabled
2 Reverse Motion disabled
Pr.04-00 to Pr.04-03 are used when the source of frequency command is the analog signal (0
to +10V DC). Refer to the following examples.
SET_FRER=FEXT*(Pr.04-02)+( Pr.04-01)+( Pr.04-00)
Example 1:
The following is the most common method. It can set parameter 02-00 to 1 (0 to +10V signal) to set
the frequency by external terminals (potentiometer).
Hz
30
60
0
0V 10V
60Hz
30Hz
0Hz
0V
5V
10V
Pr.01-00
Pr.01-00=60Hz Max. operation f requency
Pr.04-00=0Hz Potentiometer bias frequency
Pr.04-01=0 Bias polarit y
Pr.04-02=100% Potentiometer frequency gain
Pr.04-03=0 F orward motion only
Max. operation frequency
Factory set ting
Potentiometer scale
Example 2:
In this example with the potentiometer set to 0V the Output Frequency is 10 Hz. The mid-point of the
potentiometer becomes 40 Hz. Once the Maximum Output Frequency is reached any further
increase of the potentiometer will not increase output frequency.