Instruction manual

156
PARAMETERS
4.2.49 Biases and gains of the frequency setting voltage (current)
(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"
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), i.e. 0 to 5VDC,0 to
10VDC or 4 to 20mADC, and the output frequency.
 Use Pr. 902 to set the bias of the voltage signal and use Pr. 903 to set its gain
 Use Pr. 904 to set the bias of the current signal and use Pr. 905 to set its gain.
* Factory settings may differ because of
calibration parameters.
<Setting>
(1) The frequency setting voltage (current) biases and gains may be adjusted by any
of the three following ways:
1) Any point can be adjusted with a voltage applied across terminals 2-5 (with a
current flowing across terminals 4-5).
2) Any point can be adjusted with no voltage applied across terminals 2-5 (with no
current flowing across terminals 4-5).
3) Only the bias and gain frequencies are adjusted and the voltage (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
Pr. 38 "frequency at 5V (10V) input"
Pr. 39 "frequency at 20mA input"
Pr. 73 "0-5/0-10V selection"
Pr. 79 "operation mode selection"
Related parameters
Output frequency (Hz)
Pr.903
Pr.905
Pr.904
(60Hz)
0
0
4
Frequency setting signal
5V
10V
20mA
Factory setting
Bias
Gain
Pr.73
Pr.902
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