Toshiba H7 - Page 94

H7 ASD Operation Manual 87
Analog Input Filter
Program ⇒ Frequency Setting Parameters ⇒ Analog Filter
Analog filtering is applied after the analog reference signal is converted to a
digital signal. The type of filtering used is Rolling Average over time.
Settings:
None
Small
Medium
Large
The analog input signal is sampled and converted to a digital signal. With no
filtering applied, the digital value from the conversion is scaled for use by the
microprocessor of the ASD.
If the filtering selection is Small, the ASD averages the last 5 sampled (digital)
values. The rolling average is updated (every 4 µS) and scaled for use by the
microprocessor.
If the filtering selection is Medium, the ASD averages the last 20 sampled
(digital) values. The rolling average is updated (every 4 µS) and scaled for use
by the microprocessor.
If the filtering selection is Large, the ASD averages the last 50 sampled
(digital) values. The rolling average is updated (every 4 µS) and scaled for use
by the microprocessor.
False responses to electrical noise are eliminated with no loss in bandwidth
because the value used by the drive is the average value of several samples.
Direct Access Number — F209
Parameter Type — Selection List
Factory Default — None
Changeable During Run — Yes
F209 F209
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