MAGUIRE Gravimetric Gateway LineMaster Installation Operation & Maintenance page 77

LineMaster
XUL Extrusion Control - Upper Adjustment Limit
XUL sets an upper limit to how far the software can adjust the extruder speed (control
voltage) once in the LOCK mode. If while in LOCK mode this limit is exceeded, then the
adjustment is NOT made, and the ALARM is turned on. If the alarm occurs, pressing the
silence alarm button on the controller will quiet the alarm, however the alarm condition still
exists. To reset the alarm you must UNLOCK the XCD-X Extruder Drive Speed Control by
placing the switch in the manual position.
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.
CPL Yield Control - Counts Per Linear unit of measure
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 then the number of pulses per METER that the
encoder generates.
The encoder we supply standard is a 600 pulses per revolution and the wheel is 1 foot in
circumference. So the standard setting in AMERICA for CPL would be 600. If you used a
1 meter circumference wheel the setting would be 600.
foot. So you have to calculate this per meter.
1 meter = 3.28 feet. This means the encoder wheel will have to turn 3.28 times to = 1
meter. 3.28 x 600 pulses = 1968.
This is a theoretical setting. Once the line is up and running stable, take a couple of length
samples (1 foot or 1 meter) and weigh them to compare what is on the display for gr/l. This
should all be done while in the manual mode. If the actual gr/l length does not match the
display gr/l then adjust the CPL value. Increasing the CPL value will increase the
displayed gr/l and decreasing the CPL value will decrease the displayed gr/l.
PTD Yield Control - Pulse Train Delta, trip point
This allows some error in the pulse train rate. For example, if the pulses are being
generated at a rate of 6030 per minute, which is 100.5 per second, and we count pulses
every second, then we will count 100 for one second, 101 for the next, then 100, then 101
and so on. This "error" could cause adjustments to occur when no adjustment is warranted.
The PTD parameter specifies how many over or under pulses have to accumulate before
adjustment occurs. In the above example, if 6030 per minute was what we wanted, but
counts came in at 101 per second, then an error of 30 would accumulate in 1 minute. The
PTD parameter set to 00030 would cause a correction to occur at this level of error. The
default value of this parameter is 00020 (20).
Maguire Products, Inc.
But the wheel we supply is 1
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