MAGUIRE WEIGH SCALE BLENDER Installation Operation & Maintenance page 49

B L E N D E R 
W E I G H S C A L E
Zero Weight Calibration
For this key to function, you must first set the weight calibration flag ON.
Press *99 to observe flag status. Press * to toggle flag ON or OFF. With flag set ON, press EXIT. Power-off
always resets this flag to OFF.
Press the ZERO key once to set the displayed gram weight of the empty bin to zero. BE SURE the load
cells are plugged into the controller. Be sure the bin is properly in place and EMPTY when this key is
pressed.
Since the bin, even when empty, weighs about 1300 grams; it is necessary on initial setup of equipment to
instruct the controller of the exact tare weight of the empty bin.
Slight drift in the tare or zero weight during day-to-day operation is normal. All weight calculations
automatically compensate for this drift. However, when the bin is empty, if the weight displayed is more
than 50 grams above or below zero, then you may wish to reset the electronics to display zero when the bin
is empty.
If, when the bin is empty, the weight displayed is greater than 100, or less than -50, (Parameters TH and
TL), the dispense cycle will not begin. Instead, the dump valve will repeatedly try to dump any material it
thinks is in the bin or will sound the alarm if weight is below -50. If the load cell calibrations have drifted this
far, it is absolutely necessary to reset empty bin weight to zero. These minimum and maximum tare
weights are set by the TL and TH parameters. See PARAMETERS, TL and TH for more info.
Allow system to be on for at least 5 minutes to allow for warm up of certain components before setting
ZERO or FULL weights.
Generally, when zero weight shifts, the full weight reading shifts the same amount. For this reason,
resetting the ZERO WT automatically shifts the FULL WT readout by the same amount. Resetting the
ZERO weight usually is all that is necessary to also calibrate the FULL weight.
Full Weight -
key will not function until you have set ZERO WT. as described above.
If you wish to reset the controller for proper full-weight scale display, use any known weight as close to full
bin weight as possible. Do not exceed 9999 grams. Place this weight in the bin and press the FULL WT.
key. The display will show five dashes (FUL-----). Now enter the actual weight in grams of the item you are
weighing.
AGAIN, both FULL WT. and ZERO WT. have been set at the factory. A drift of several grams from these
settings is normal and should not be of any concern. Recalibration should be considered only if ZERO is
more than 20 grams off or FULL WT. is more than 50 grams off. These errors do not prevent proper
proportions from being dispensed. ZERO error is always "tared" for proper weighing of each component.
FULL scale error will only cause accumulated totals to be off by the degree of this error. The primary
function of the WEIGH SCALE BLENDER is to dispense materials in the proper ratios. Because all
components are weighed by the same load cells, the accuracy of these ratios is not affected by zero or full
scale errors.
STAR FUNCTIONS available in the MANUAL mode:
Press (*,0,0) to CLEAR ALL DATA fields. These are the material usage totals that are viewed with the
VIEW key. If you are tracking material usage, you should record these numbers periodically but clearing
these totals is entirely optional and not necessary.
After VIEWING the data or printing of data using the VIEW,* key sequence, a display of (00=CLEAR) will
appear for 5 seconds. During this 5 seconds you may reset all data fields to zero by pressing 00. Pressing
any other key or waiting 5 seconds will exit this sequence without clearing data.
Press (*,9,9) to set flag to enable Weight Calibration of the Load Cells. In later model controllers you can
specify WSB CAL or LIW CAL. Power On will always set this flag to OFF. This flag must be ON before the
load cell weight calibration keys, ZERO and FULL WT, will function. With ON flag displayed, press EXIT.
If you are collecting totals from the blender with software, a Zero Weight and Full Weight
calibration should be done periodically, approx every 6 months, to assure accurate data in
your totals reports.
ZERO WT. must be entered before FULL WT. to achieve proper calibration. The FULL WT.
M A G U I R E P R O D U C T S , I N C .
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