Delta Electronics VFD-M - Manual (Page 79)

Chapter 4 Parameters|
4-44 Revision May 2008, ME14, SW V3.04
Pr.48 to Pr.51 are used when the source of frequency command is the analog signal (0 to
+10V DC or 4 to 20mA DC). Refer to the following examples.
Example 1:
Set Pr.00=1 to command frequency with the potentiometer on keypad or Pr.00=2 (4 to 20mA current
signal) potentiometer/current signal of external terminal.
Max.
Output
Freq.
60Hz
Pr.03
0Hz
0V
4mA
5V
12mA
10V
20mA
Factory Settings
Pr.03=60Hz--Max. output Freq.
Pr.48=0%--bias adjustment
Pr.49=0 -- bias polarity
Pr.50=100% -- pot. freq. gain
Pr.51=0 -- REV disable in
negative bias
Potentiometer Scale
Hz
0V 10V
30
0
60
Example 2:
A Bias Adjustment (16.7% of 60Hz) determines the Output Frequency to be 10 Hz with the
potentiometer set at 0V as shown. Notice that the entire V/F is transposed accordingly. An analog
input voltage 0-8.33V (or current 4-13.33mA) would set frequency as 0-60Hz.Once the Maximum
Output Frequency is reached any further increase on the potentiometer will not increase output
frequency (If you want to use the range of 60Hz, please refer to the example 3).
Max.
Output
Freq.
60Hz
Pr.03
0Hz 0V
4mA
5V
12mA 10V
20mA
Factory Settings
Pr.03=60Hz--Max. output Freq.
Pr.48=16.7%-- bias adjustment
Pr.49=0 -- bias polarity
Pr.50=100% -- pot. freq. gain
Pr.51=0 -- REV motion disable in
negative bias
10Hz
Bias
Adjustment
Potentiometer Scale
Hz
0V 10V
40
10
60
It is
60Hz
in this
range.