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7.6.3
Setting the Digital Filter Parameters
Fine-tuning the digital filter parameters greatly
improves indicator performance in heavy-vibration
environments. Use the following procedure to
determine vibration effects on the scale and optimize
the digital filtering configuration.
1. In setup mode, set all three digital filters
(DIGFL1, DIGFL2, DIGFL3) to 1. Set
DFTHRH to NONE. Return indicator to
normal mode.
2. Remove all weight from the scale, then watch
the indicator display to determine the
magnitude of vibration effects on the scale.
Record the weight below which all but a few
readings fall. This value is used to calculate
the DFTHRH parameter value in Step 4.
For example, if a heavy-capacity scale
produces vibration-related readings of up to
50 lb, with occasional spikes to 75 lb, record
50 lb as the threshold weight value.
3. Place the indicator in setup mode and set the
digital filters (DIGFLx) to eliminate the
7.7
Analog Output Calibration
The following calibration procedure requires a
multimeter to measure voltage or current output from
the analog output module. If the option is not already
installed, see Section 2.4 on page 7.
CONFIG
XXXXXXX
FORMAT
CALIBR
SOURCE
OFFSET
0%
GROSS
20%
NET
1. Enter setup mode and go to the ALGOUT
menu (see Figure 7-4).
•
Set OFFSET to 0% for 0–10 V output,
20% for 4–20 mA output
•
Set MIN to lowest weight value to be
tracked by the analog output
•
Set MAX to highest weight value to be
tracked by the analog output
2. Connect multimeter to analog output:
•
For voltage output, connect voltmeter
leads to pins 3 and 4
•
For current output, connect ammeter
leads to pins 1 and 2
40
IQ plus 350 Installation Manual
SERIAL
PROGRM
PFORMT
XXXXXXX
ERRACT
MIN
FULLSC
000000
HOLD
number
ZEROSC
Figure 7-4. Analog Output Menu
vibration effects on the scale. (Leave
DFTHRH set to NONE.) Reconfigure as
necessary to find the lowest effective values
for the DIGFLx parameters.
4. With optimum values assigned to the DIGFLx
parameters, calculate the DFTHRH parameter
value by converting the weight value recorded
in Step 2 to display divisions:
threshold_weight_value / DSPDIV
In the example in Step 2, with a threshold
weight value of 50 lb and a display division
value of 5D:
50 / 5D = 10.
be set to 10DD for this example.
5. Finally, set the DFSENS parameter high
enough to ignore transient peaks. Longer
transients (typically caused by lower vibration
frequencies) will cause more consecutive
out-of-band readings, so DFSENS should be
set higher to counter low frequency transients.
Reconfigure as necessary to find the lowest
effective value for the DFSENS parameter.
NOTE:
The analog output must be calibrated after the
indicator itself has been configured (Section 3.0) and
calibrated (Section 4.0).
DIG IN
XXXXXXX
ALGOUT
MAX
10000
number
3. Adjust zero calibration: Scroll to the
TWZERO parameter. Check voltage or
current reading on multimeter. Press and hold
or
to adjust the zero value up or down.
4. Adjust span calibration: Scroll to the
TWSPAN parameter. Check voltage or
current reading on multimeter. Press and hold
or
to adjust the span value up or down.
5. Final
zero
calibration:
TWZERO parameter and verify that the zero
calibration has not drifted. Press and hold
or
to re-adjust the zero value as required.
6. Return to normal mode. Analog output
function can be verified using test weights.
DFTHRH should
XXXXXXX
VERS
TWZERO
TWSPAN
Return
to
the
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