Hardy HI 1756-FC - Manual (Page 23)

Bit 12 Initial Refill Mode
MANUALOP 37
Two decimal places. This it the output percent when in
MANUAL mode.
FAST_ROC 38
Lightly averaged rate of change, read only, RATE decimal
places.
zerocount 0x0A00 AD counts at zero weight
calLowCount 0x0A01
Numbers or letters in the titles below correspond to the values in Column 2, Hex#, above
Parameter 2 Metric (Unit of Measure)
The Unit parameter sets the scale and related displays to one of the following options:
 Pounds (lb) - Default
 Ounces (oz)
 Ton (ton) short ton
 Kilograms (kg)
 Grams (g)
 Metric Tonnes (t) long ton
Range: LB, OZ, TON, KG, G, T (default LB)
Any weight value input to the module (e.g. CALLOWWEIGHT, SPANWEIGHT) are in
the currently selected unit. The unit of measure can be set at any time, not just at
calibration. Set the metric before calibrating to verify the unit of measure.
Note The weigh scale module does not need to be recalibrated after changing the metric value.
Parameter 3 Span Weight
The Span Weight is a reference point derived from an actual measured weight. This
should not be confused with the Scale Capacity. If you have a 100 pound weight and you
place it on the scale, the Span Weight would be 100 pounds.
Parameter 4 Cal low weight
This reference weight is the weight of any product on the scale that is not removed during
calibration (derived from actual measured weight used at cal low or C2 cal). Normally,
you would remove all “live load” weight from the scale to obtain a CalLow Weight of
0.0. The location of the decimal point in this value is based on the Weight decimal point
parameter.
Range: Must be > or = 0.
Parameter 5 ROC time base
The Time Base is the length of time in seconds between two weight readings that are
subtracted to determine the initial flow rate. By increasing the time base, you increase the
time between weight readings. This allows more material to be dispensed during the time
base period. Low flow rates require a longer time base than high flow rates. The
controller measures weight to about 1 part in 10,000. The formula below provides a
minimum. Auto rate calibration uses a minimum of 10 ROC Time periods to make the
rate calculation.
TIME BASE > (SCALE CAPACITY/5000)/LOW SETPOINT (units per sec.)
SCALE CAPACITY/5000 = determines minimum weight increment
Example: (440/5000) = 0.088 lb
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Chapter 4
The lowest setpoint in units per second @ 3 lb per min is: 3 lb/60 sec = 0.05 lb/sec
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