Toshiba Tosvert VF-S15 Instruction Manual page 150

6.10.3 Fine adjustment of analog frequency command
f470 : VIA input bias
f471 : VIA input gain
f472 : VIB input bias
 Function
These parameters are used to fine adjust the relation between the frequency command input through
the analog input terminal VIA, VIB, VIC and the output frequency.
Use these parameters to make fine adjustments after making rough adjustments using the
parameters f201 to f204, f210 to f213, f216 to f219
The figure below shows the characteristic of the frequency command input through the VI terminal and that of
the output frequency.
Output frequency (Hz)
Maximum frequency

f472
f474
0
* Bias adjustment of analog input terminal (f470, f472, f474)
Decrease the value in case frequency is output even though the frequency command is 0 (zero) Hz.
* Gain adjustment of analog input terminal (f471, f473, f475)
Increase the value in case the output frequency doesn't reach the maximum frequency even though the
maximum voltage and current are applied.
f473 : VIB input gain
f474 : VIC input bias
f475 : VIC input gain
Large
Large
Small
0%
0V
4mA
Frequency setting signal（ VI input value） (Analog input value)
F-39

f473
f475
Small
Default setting
100%
10Vdc
20mAdc
E6581926
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