Hardy HI 1756-FC - Manual (Page 24)

Thus:
TIME BASE = 0.088/0.05
TIME BASE = 1.76 (rounded to 2)
MINIMUM TIME BASE = 2 seconds
Range: In seconds, 0 decimal places. 1-1800 seconds.
Parameter 6 ROC time units
The units of time (seconds, minutes or hours) you want for the Rate of Change. The ROC
display on the summary display will read in these units.
Range: 0=sec, 1=min, 2=hr (default Seconds)
Parameter 7 Averages
This is the number of samples to average when determining a value to reduce the affect
of material impact and/or vibration as material moves on and off the scale. The Rate
Controller takes 100 readings per second. If you average enough weight readings, the
weight loss or gain remains smooth and the displayed value shows little or no fluctuation,
although it is actually recalculated (by sliding average) with each reading. If a weight
reading fluctuates too much, increase the number of readings in the average, but for
applications that require a very quick weight reading, do not set this value too high.
The averaging parameter is most often set when using any device that outputs an erratic
signal (e.g. a flow meter). Using the averaging function comes at the expense of response
time. A setting of one average takes 10 milliseconds. A setting of 100 averages takes 1
second. The averaging function is a running average, where the input signals are totaled
and the total is divided by the averaging number. The instrument reads one new signal
plus the last number of averages signals and repeats the averaging process again.
For example: With a setting of 20 averages, the instrument reads the 20 most current
input signals, totals the signals, divides by 20, drops the oldest one, reads one new signal
along with 19 old readings, totals the signals, divides by 20, drops the oldest one, etc.
Range: 1-255 (default 1)
See also WAVERSAVER for information on filtering unstable weight readings.
Parameter 8 WAVERSAVER®
Chapter One provides a detailed description of WAVERSAVER’s function and purpose.
In short, WAVERSAVER helps to mitigate the effects of vibratory forces, allowing the
HI 1756 FC to distinguish between actual weight data and mechanical noise in the signals
the load cell sends. WAVERSAVER can be configured to ignore noise with frequencies
as low as 0.25 Hz. High values allow faster readings, while the lower values raise the
degree of filtration. 7.5 Hz provides the least vibration immunity with the fastest response
time. 0.25 Hz provides the most vibration immunity with the slowest response time. The
function is user selectable and can be turned off.
Range: OFF, 7.50 Hz, 3.50 Hz, 1.00 Hz (Default), 0.50 Hz, 0.25 Hz
Parameter 9 Rate Calibration Configuration PID P
The P parameter for Rate Calibration. See Chapter 5 for additional instructions on
running Rate Calibration. Rate calibration determines this parameter, so you may not
want to set it. It would be difficult to know what to enter.
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Chapter 4
P and I values: Use Rate Calibration to calibrate the system starting flow rate. Rate
calibration establishes the feeder maximum rate, PI settings, and the starting OP% for a
given rate setpoint. From that starting point, the controller adjusts the OP% to maintain
an optimized setpoint. Environment and product conditions require monitoring and
adjustment to meet the requested setpoint target.
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