189
PARAMETERS
4
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.
zUse Pr. 902 to set the bias frequency at 0V.
zUse Pr. 903 to set the output frequency relative to the frequency command voltage set in Pr. 73.
zUse Pr. 904 to set the bias frequency at 4mA.
zUse Pr. 905 to set the output frequency relative to the 20mA frequency command current (4 to 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.
Parameter
Number
Factory Setting* Setting Range
902 0V 0Hz 0 to 10V 0 to 60Hz
903 5V 60Hz 0 to 10V 1 to 400Hz
904 4mA 0Hz 0 to 20mA 0 to 60Hz
905 20mA 60Hz 0 to 20mA 1 to 400Hz
Related parameters
Pr. 20 "acceleration/deceleration
reference frequency"
Pr. 73 "0-5V/0-10V selection"
Pr. 79 "operation mode selection"
Pr.902
Pr.904
Pr.903
Pr.73
Pr.905
Gain
Output frequency (Hz)
Bias
Factory setting
Frequency setting signal
0
0
4
0
5V
10V
20mA
100%
60Hz
