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M A G U I R E P R O D U C T S , I N C .
Edition: August 5, 2014
51
W E I G H S C A L E B L E N D E R
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parameter. If you change the FUL parameter, the MAX parameter will automatically be set to a
value 50 percent higher then the FUL setting.
DISPENSE STATION CONFIGURATION.
This controller can be configured to operate as a dispense station (model WSD). This is generally
done when exact weights of material or blend are required to place into a process, such as
rotational molding. In this configuration, the thumbwheel switches tell the controller how much
weight to dispense in pounds (or kilos). The FUL parameter is set to 00001 or 00002 for direct
reading of the top thumbwheel switch; or optionally, for recipe reading of the second thumbwheel
switch.
When dispense weight you request exceeds the amount specified in the MAX parameter, the unit
will automatically make multiple dispenses that will add up to the requested amount.
TH
Change only if material sticks in the weigh bin
TL
TH and TL are acceptable error limits for TARE WEIGHT.
Before a dispense cycle begins, the software checks to see that the weigh bin is in place and that it
is not already full of material. To do this it looks at the starting TARE weight.
If Tare weight is below the value of TL, (50 grams), the software assumes that the bin is either
missing or hung up on something. In this case the ALARM sounds.
If Tare weight is above the value of TH (100 grams), the software assumes material is in the bin. In
this case the ALARM sounds and the weight bin dump flap operates in an attempt to empty the
weigh bin.
If you are processing a material that has a tendency to hang up in the corners of the bin, then you
may wish to widen the range of acceptable starting tare weight. Since tare weight is always
subtracted from dispense weights, these errors do not effect accuracy.
Components – Material 1 through Material 12
RP
Retry Limits - No change required
RD
_RD is set AUTOMATICALLY by the CALIBRATE routine
These two parameters determine the dispense shortage error that is be acceptable for
each component.
_RP is the shortage expressed as a PERCENT of the target dispense weight and _RD is
the shortage expressed in GRAMS. These parameters are used together, either one will
force a "retry".
A "retry" is an additional dispense that is calculated to add the amount of material that is
short. This comes into play only when the amount dispensed is less than expected.
Retries will occur until the difference between the required amount and the metered
amount is equal to or less than the _RP percent difference AND the _RD weight difference.
These numbers dictate just how close to perfect the dispense has to be before going on. If
the dispense overshoots the target, then the process continues. These parameters only
control the degree of weight SHORTAGE that is acceptable.
Summary of Contents for Weigh Scale Blender WSB
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