Toshiba TOSVERT VF-AS3 Instruction Manual page 267

The allowance is zero setting on default setting.
■ Parameter setting
Title Parameter name
F470 RR input bias
F471 RR input gain
F472 RX input bias
F473 RX input gain
F474 II input bias
F475 II input gain
F476 AI4 input bias
F477 AI4 input gain
F478 AI5 input bias
F479 AI5 input gain
■ Adjustment method
For the frequency commands to be input to the analog terminals and the output frequency
characteristics, refer to the following figure.
Output frequency (Hz)
Point 2 frequency
<F470>
<F472>
<F474>
0
0%
0V
4mA
Analog input terminal bias adjustment (<F470>, <F472>, <F474>, <F476>, and <F478>)
To avoid the influence of noise, there is a tolerance for the minimum input amount so that the
inverter starts output after some voltage/current is applied to the analog input terminal by default
setting.
To decrease this tolerance value, increase the bias value for a corresponding terminal.
However, if the set value is too large, frequency may be output even when the frequency command
is set to 0 (zero).
Analog input terminal gain adjustment (<F471>, <F473>, <F475>, <F477>, and <F479>)
The set maximum frequency is output before voltage/current reach the maximum value to avoid
trouble such as voltage drop by default setting.
Adjustment range
0-255
0-255
0-255
0-255
0-255
0-255
0-255
0-255
0-255
0-255
Large
Large
Small
6-25
Unit
-
-
-
-
-
-
-
-
-
-
<F471>
<F473>
<F475>
Small
Default setting
Frequency command signal
100%
10Vdc
20mAdc
6. [Advanced] How to use parameters
E6582062
Default setting
128
128
128
128
128
128
3
128
4
128
128
128
6
9