680HE Synergy Indicator
66
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Digital Rolling Average Filter Procedure
1. In setup mode, set the rolling filter stage parameters (
DIGFL1-3
) to 1.
2. Set
DFTHRH
to
NONE
.
3. Return to weigh mode.
4. Remove all weight from scale, then watch the indicator to determine the magnitude of vibration effects on the scale.
5. Record weight below which all but a few readings fall. This value is used to calculate the
DFTHRH
.
Example – if a heavy-capacity scale (10000 x 5 lb) produces vibration-related readings of up to 50 lb, with occasional
spikes up to 75 lb, record 50 as the threshold weight value.
6. Place the indicator in setup mode and set the filter stage parameters (
DIGFL1-3
) to eliminate the vibration effects on
the scale (leave
DFTHRH
set to
NONE
).
7. Find the lowest effect value for the
DIGFL1-3
parameters.
If needed, the digital filter cutout sensitivity (
DFSENS
) and the digital filter cutout threshold (
DFTHRH
) can be used to reset the
digital rolling average filter so the response to a rate change is faster.
8. Calculate the
DFTHRH
parameter value by converting the weight value recorded in
to display divisions
(
Threshold_Weight_Value / Display_Divisions
).
, with a threshold value of 50, and a display divisions value of 5, set the DFTHRH parameter to
10 display divisions.
9. Set the
DFSENS
parameter high enough to ignore transient peaks. Longer transients (typically caused by lower
vibration frequencies) causes more consecutive out-of-band readings; set the
DFSENS
parameter higher to counter
low frequency transients.
11.6.2 Adaptive Filter (ADPONL)
The adaptive filter has two settings, sensitivity (
ADSENS
) and threshold (
ADTHRH
). It maintains a running average of the A/D
readings when the weight change remains less than the defined threshold value. The filter automatically applies less value to
each successive A/D reading the longer the weight change is less than the threshold value. The amount of value given to the
most recent A/D reading is determined by the sensitivity setting.
Adaptive Filter Sensitivity (ADSENS)
Adaptive filter sensitivity (
ADSENS
) can be set to
HEAVY
,
MEDIUM
or
LIGHT
. A
HEAVY
setting results in an output which is
more stable to weight changes than the
LIGHT
setting. A
HEAVY
setting also results in small changes in weight data (a few
grads) on the scale base to not be seen as quickly as with the
LIGHT
setting.
If the difference in typical subsequent weight values on the scale are only a few display divisions, use a
LIGHT
setting. On a
truck scale where the changes in subsequent weight values are 100s of display divisions, a
HEAVY
setting is more appropriate.
Adaptive Filter Threshold (ADTHRH)
Set the adaptive filtering threshold (
ADTHRH
) for the amount of observed instability in the system. This parameter can be set in
the range of 0–2000 and is entered as a weight value. When a new sampled weight value is acquired, the adaptive filter
compares the new value to the previous (filtered) output value.
If the difference between the new value and the previous output value is greater than the
ADTHRH
parameter the adaptive filter
is reset to the new weight value.
If the difference between the new value and the previous output value is less than the
ADTHRH
parameter, the two values are
averaged together using a weighted average. The weighted average is based on the amount of time the system has been
stable, and selected
ADSENS
sensitivity.
With the adaptive filter threshold set at zero, determine the amount of instability present. Enter this amount of weight instability
to set the threshold of the adaptive filter. The adaptive filter is set to
OFF
the
ADTHRH
parameter is set to zero.
Содержание Synergy 680HE
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