Bedford B550-2002 - Page 53

5
5-27
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.
Example 3:
The whole scale of the potentiometer may be used as desired. In addition to the signals 0 to
10V and 4 to 20mA, other popular voltage signals include 0 to 5V, 20 to 4mA or that under 10V.
Max.
Output
Freq.
Pr.03
Bias
Adjustment
0V 10V
4mA
0Hz
10Hz
60Hz
20mA
-2V
XV
Pr. 50 = X 100% 83.3% =
10V
12V
Negative bias:
60-10Hz
10V
10-0Hz
XV
=
XV =
100
50
= 2V
Pr.48 = X 100%
2
10
Potentiometer Scale
Hz
0V
10V
35
0
60
Example 4:
This example shows how to use Gain to set a potentiometer range of 0 to 5 Volts for 0-60 Hz.
As an option, you also could set Pr. 03 =120Hz
Hz
0V
5V
30
0
60
Potentiometer Scale
Factory Settings
Pr.03=60Hz--Max. output Freq.
Pr.48=0.0% bias adjustment
Pr.49=0 -- bias polarity
Pr.50=200% -- pot. freq. gain
Pr.51=0 -- REV motion disable
in negative bias
Max.
Output
Freq.
60Hz
Pr.03
0Hz 0V
5V
Calculation of gain
10V
5V
)X100% = 200%
30Hz
Gain adjustment
B550 Series sensorless vector frequency drive