Delta Electronics VFD-M Series User Manual page 81

Chapter 4 Parameters|
Example 5:
In this example, a 6 Hz (10% of 60 Hz) negative bias is used. This setting is used to provide a noise
margin (1V in this example) in noisy environments. Note that the top frequency is reduced to 54 Hz.
Max.
Output
Pr.03
Freq.
60Hz
54Hz
0Hz
Negative
0V
bias 6Hz
Example 6:
This example also uses negative bias and includes a potentiometer frequency gain to allow the AC
drive to reach the Maximum Output Frequency.
Max.
Output
Pr.03
Freq.
60Hz
0Hz
Negative
0V
bias 6.6Hz
Example 7:
In this example, the potentiometer is programmed to run a motor in forward or reverse direction. The
motor will idle when the potentiometer is set at the scale mid-point. Please note that this adjustment
will disable the external FWD and REV controls.
Pr.03
60Hz
30Hz
0Hz
0V
REV
4-46
Pr.03=60Hz--Max. output Freq.
Pr.48=10.0% -- bias adjustment
Pr.49=1 -- bias polarity
Pr.50=100% -- pot. freq. gain
Pr.51=0 -- Rev. motion disable
in negative bias
1V
10V
Bias adjustment
Pr.03=60Hz--Max. output Freq.
Pr.48=10%--bias adjustment
Pr.49=1 -- bias polarity
Pr.50=111% -- pot. freq. gain
Pr.51=0 -- REV. motion disable
in negative bias
1V
10V
Pr.50=( 10V
Max.Output Freq.
FWD
Factory Settings
Pr.03=60Hz--Max. output Freq.
Pr.48=50%--bias adjustment
Pr.49=1 -- bias polarity
5V 10V
Pr.50=200% -- pot. freq. gain
30Hz
Pr.51=1 -- REV motion disable
in negative bias
60Hz
Factory Settings
Factory Settings
Calculation of gain
)X100%=111%
9V
24
It's 0Hz
within
0
this
range.
Hz
0V
Potentiometer Scale
27
It's 0Hz
within
0
this
range.
Hz
0V
Potentiometer Scale
0
FWD.
REV.
60
60
Hz
10V
0V
Potentiometer Scale
Revision May 2008, ME14, SW V3.04
54
10V
60
10V