Fine Adjustment Of Frequency Setting Signal - Toshiba TOSVERT VF-MB1 Instruction Manual

6.6.4
f470 : VIA input bias
f471 : VIA input gain
f472 : VIB input bias
 Function
The figure below shows the characteristic of the frequency setting signal input through the VI terminal and
that of the output frequency.
6
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Fine adjustment of frequency setting signal

These parameters are used to fine adjust the relation between the frequency setting signal 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
Output frequency (Hz)
Maximum frequency
Large

f472
f474
0
0%
0V
4mA
Frequency setting signal（ VI input value）
Bias adjustment of analog input terminal ( f470 , f472 , f474 )
To give leeway, the inverter is factory-adjusted by default so that it will not produce an output until a
certain amount of voltage is applied to the analog input terminal. If you want to reduce the leeway, set this
value to a larger value. Note that specifying a too large value may cause an output frequency to be output,
even though the operation frequency is 0 (zero) Hz.
Gain adjustment of analog input terminal ( f471 , f473 , f475 )
The inverter is factory-adjusted by default so that the operation frequency can reach the maximum
frequency, even though the voltage and current to the analog input terminal are below the maximum
levels. If you want to adjust the inverter so that it will output the maximum frequency at the maximum
voltage and current, set this value to a smaller value. Note that specifying a too small value may cause
the operation frequency not to 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
Small
Default setting
Small
100%
10Vdc
20mAdc
(Analog input value)
F-20
E6581697

f473
f475