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2
.3.18 Biases and gains of the frequency setting voltage (current)
to
You can set the magnitude (slope) of the output frequency as desired in relation
to the external 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.
Frequency setting voltage signal
Factory setting
0Hz( )
C2
5V or 10V
(100% C4 )
0V
Pr.73
Output
frequency (Hz)
( Pr.38 )
60Hz<50Hz>
Frequency setting current signal
20mA
4mA
Factory setting
( Pr.39 )
60Hz<50Hz>
Output
frequency (Hz)
0Hz( )
C5
(0% C3 )
(Across
terminals
2-5)
(20% C6 )
(100% C7 )
(Across
terminals
4-5)
Parameter Name
Factory Setting
<EC version>
Setting
Range
Remarks
38
Frequency setting voltage gain
frequency
60Hz
<50Hz>
1 to 120Hz
39
Frequency setting current gain
frequency
60Hz
<50Hz>
1 to 120Hz
C2 (902)
Frequency setting voltage bias
frequency
0Hz 0 to 60Hz
C3 (902) Frequency setting voltage bias 0% * 0 to 300%
C4 (903) Frequency setting voltage gain 96% * 0 to 300%
C5 (904)
Frequency setting current bias
frequency
0Hz 0 to 60Hz
C6 (904) Frequency setting current bias 20% * 0 to 300%
C7 (905) Frequency setting current gain 100% * 0 to 300%
Setting is enabled
when Pr. 30 = "1".
* Settings may differ because of calibration parameters.
The parameter numbers within parentheses are those for use of the parameter unit (FR-PU04).
When the parameter unit (FR-PU04) is used, operation from the operation panel is not accepted.
POINT
Bias setting for 0-5VDC (0-10VDC) input Use calibration parameters C2, C3 for setting.
Gain setting for 0-5VDC (0-10VDC) input Use Pr. 38, calibration parameter C4 for
setting.
Bias setting for 4-20mADC input Use calibration parameters C5, C6 for
setting.
Gain setting for 4-20mADC input Use Pr. 39, calibration parameter C7 for
setting.
(For 4 to 20mADC input, set "4" in any of Pr. 60 to Pr. 63 (input terminal function
selection) and assign AU (current input selection) to any of terminals RH, RM, RL
and STR, and turn on the AU signal.)