Rice Lake IQ plus 350, Installation Manual

40

IQ plus 350 Installation Manual

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

t h e   i n d i c a t o r   d i s p l a y   t o   d e t e r m i n e   t h e
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

v i b r a t i o n   e ff e c t s   o n   t h e   s c a l e .   ( L e ave
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. 

DFTHRH should

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.

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.

NOTE:

  The analog output must be calibrated 

after

  the

indicator itself has been configured (Section 3.0) and
calibrated (Section 4.0).

Figure 7-4. Analog Output Menu

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

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: Return to the

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.

XXXXXXX

XXXXXXX

VERS

ALGOUT

DIG IN

XXXXXXX

PROGRM

PFORMT

SERIAL

CALIBR

XXXXXXX

CONFIG

FORMAT

SOURCE

GROSS

0%

20%

OFFSET

ERRACT

FULLSC

HOLD

000000

number

MIN

10000

number

MAX

TWZERO

NET

TWSPAN

ZEROSC