PARAMETERS
157
4.2.56 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 output frequency as desired in relation to the frequency setting signal (0 to 5V, 0 to 10V or 4
to 20mA DC).
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
Number
Factory Setting
Setting Range
902
0V
0Hz
0 to 10V
0 to 60Hz
903
5V
60Hz
〈
50Hz
〉
0 to 10V
1 to 120Hz
904
4mA
0Hz
0 to 20mA
0 to 60Hz
905
20mA
60Hz
〈
50Hz
〉
0 to 20mA
1 to 120Hz
60Hz
〈
50Hz
〉
Pr.902
Pr.904
Pr.903
Pr.73
Pr.905
Gain
Out
p
ut f
req
ue
nc
y
(
H
z
)
Bias
Factory setting
Frequency setting signal
0
0
4
0
5V
10V
20mA
100%
<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.
Pr. 20 "acceleration/deceleration
reference frequency"
Pr. 73 "0-5V/0-10V selection"
Pr. 79 "operation mode selection"
Related parameters
4
