H9 ASD Installation and Operation Manual 109

Analog Input Filter

Program ⇒ Frequency ⇒ Analog Filter
Analog filtering is applied after the analog reference signal is converted to a
digital signal. The ty pe of filtering used is Rolling Average over time.
Settings:
0 — None (1 mS)
1 — Small (8 mS)
2 — Medium (16 mS)
3 — Large (32 mS)
4 — Huge (64 mS)
The analog input signal is sampled and converted to a digital signal. With no
filtering applied, the resulting di gital value is scaled for use by the
microprocessor of the ASD.
If the filtering selecti on Small is selected, the ASD averages the last 8 mS of
sampled signal and converted (digital) values. The rolling average is update d
(every 4 µS) and s caled for use by th e microprocessor.
This holds true for the Medium, Large, and Huge selections providing a larger
sample to produce the avera g e fo r us e by the microprocessor.
False responses to el ectrical noise are el iminated 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