Frequency Setting Voltage (Current) Bias And Gain (Pr. 902 To Pr. 905) - Mitsubishi Electric FR-A500 Instruction Manual

4.2.67 Frequency setting voltage (current) bias and gain (Pr. 902 to Pr. 905)

Pr. 902 "frequency setting voltage bias"
Pr. 903 "frequency setting voltage gain"
Pr. 904 "frequency setting current bias"
Pr. 905 "frequency setting current gain"
You can set the magnitude (slope) of the output frequency as desired in relation to the frequency setting
signal (0 to 5V, 0 to 10V or 4 to 20mADC).
The "bias" and "gain" functions are used to adjust the relationship between the input signal entered from
outside the inverter to set the output frequency, e.g. 0 to 5VDC, 0 to 10VDC or 4 to 20mADC, and the output
frequency.
Use Pr. 902 to set the bias frequency at 0V.
Use Pr. 903 to set the output frequency relative to the frequency command voltage set in Pr. 73.
Use Pr. 904 to set the bias frequency at 4mA.
Use Pr. 905 to set the output frequency relative to the 20mA frequency command current (4 to 20mA).
Parameter
Factory Setting*
Number
902 0V
903 5V
904 4mA
905 20mA
*Factory settings may differ because of calibration parameters.
<Setting>
(1) The frequency setting voltage biases and gains may be adjusted in either of the following three ways:
1) Any point can be adjusted with a voltage applied across terminals 2-5.
2) Any point can be adjusted with no voltage applied across terminals 2-5.
3) Bias voltage is not adjusted.
(2) The frequency setting current biases and gains may be adjusted in either of the following three ways:
1) Any point can be adjusted with a current flowing at terminal 4.
2) Any point can be adjusted with no current flowing at terminal 4.
3) Bias current is not adjusted.
Setting Range
0Hz 0 to 10V
60Hz <50Hz> 0 to 10V
0Hz 0 to 20mA
60Hz <50Hz> 0 to 20mA
Factory setting
60Hz
〈50Hz〉
Bias
Pr.902
Pr.904
0
Frequency setting signal
0
0
4
185
Related parameters
Pr. 20 "acceleration/deceleration
reference frequency"
Pr. 73 "0-5V/0-10V selection"
Pr. 79 "operation mode selection"
0 to 60Hz
1 to 400Hz
0 to 60Hz
1 to 400Hz
Gain
Pr.903
Pr.905
100% Pr.73
5V
10V
20mA
PARAMETERS
4