Conair WSB - Manual (Page 64)

batch weight of 2000 grams.
The FIRST TWO digits indicate how many cycles must run without a
rate adjustment before the operator is permitted to switch from voltage
(manual) control to Throughput (automatic) control. This is a factor
during startup only. Larger numbers assure a very accurate rate has
been learned. This is preferred if you like the way your extruder is
running and do not want any further adjustment unless a real problem is
detected. On the other hand, if you know that you want output to be a
predetermined value, like 1000 pounds per hour, then switching sooner
is better. In this way the operator can enter the rate he desires
sooner, and the blender can immediately make any required adjustments
required to target in on this rate. Too large a number causes delayed
response, too small causes hunting. Larger is safer since you do not
want "false" adjustments to occur.
This parameter starts at XTP 50030, 30 percent of full batch
weight accumulated error and 5 cycles required without adjustment
before your operator can switch to the Throughput mode. A "T" is
displayed when the 5 cycle requirement is reached.
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XAL Extrusion Control Adjustment Limit
XAL limits the degree of change that the software can make in one
adjustment cycle. Default setting is 00005, 5 percent. Operator
entered rate changes are not limited.
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XUL Extrusion Control - Upper Adjustment Limit
XUL sets an upper limit to how far the software can adjust the
extruder speed (control voltage). If this limit is exceeded, then the
adjustment is NOT made, and the ALARM is turned on. Pressing the V/T
key switches the control to Voltage Mode. When pressed again, the unit
returns to Throughput Mode, and a new Limit is set. Further
adjustments may now occur to the new limit.
Default is 00200, 2 volts. The idea is that once control is
established, adjustments upward of more then 2 volts indicate
conditions that should be attended to, a clogged screen pack for
example. You may wish to reduce this number so that operators are
warned well in advance of such conditions.
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CPL Yield Control - extrusion control.
Customers using Yield Control require a pulse generator, or shaft
encoder, mounted on downstream takeoff equipment to signal the line
speed to the blender. In operation the software displays GRAMS per
unit length, which may be per foot, per yard, per meter, or whatever.
For whichever unit length you select, enter the pulses per unit length
in this parameter. In America, a typical shaft encoder delivers 600 or
1200 pulses per foot. Set the parameter to 600 or 1200. Everywhere
else you are most likely concerned with meters. The proper setting for
this parameter is the number of pulses per METER that the encoder
generates.
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