Maguire Products WEIGH SCALE BLENDER WSBMB Series, Installation Operation & Maintenance

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M A G U I R E P R O D U C T S , I N C .
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W E I G H S C A L E B L E N D E R
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XCV
XRC
Extrusion Control Voltage
(For Extrusion Control Systems only)
XCV - "Extruder speed Control Voltage" is used in conjunction with our extrusion control
software. This number can range from 0 to 1000 (XCV 00000) to XCV 01000) and
determines the voltage output on pin S of the Amphonol connector. Pin R is the neutral or
zero reference for this voltage output.
The voltage ranges from 0 to 10 volts. 01000 = 10.00 volts. This parameter can be set
manually; however it is intended to be controlled by the extrusion control logic or by MLAN
communications in conjunction with our extrusion control software.
Whenever the software control logic makes a change to this voltage, up or down, the
controller display will say (RAMPING) during the time the voltage is being adjusted.
XRC - "Extruder speed Rate of Change", determines the ramp up or ramp down rate of the
XCV parameter, above. It can range from 0 to 10 (XRC 00000) to (XRC 00040). Default
setting is 00040.
When XCV changes, it does so gradually, making small incremental changes every 10
interrupts, or about 24 incremental changes per second. The XRC parameter determines
the maximum value of each incremental change. For example, if XRC is set to 1 then the
XCV number will increment by 1 count (0.01 volt) every 10 interrupts, for a rate change of
24 counts (0.24 volt) per second, which will produce a full range change from 0 to 10 volts
over about 41 seconds.
TCV
TRC
Takeoff Control Voltage
(For Extrusion Control Systems only)
These parameters control a second 0-to-10-volt voltage output on for controlling Takeoff
control speed. They operate the same as the XCV and XRC covered above except they
move in the opposite direction, higher to reduce weight per foot, lower to increase weight
per foot.
XTP
Extrusion Control Trip Point
(For Extrusion Control Systems only)
The LAST THREE digits of the XTP parameter specify the TRIP POINT when software
makes an adjustment to the throughput rate number, which will then cause a change in
extruder speed. Speed is held steady until there is significant indication that the throughput
rate is incorrect. The software analyzes each batch watching for any meaningful deviation
from current controlling rate. These last three digits of this parameter specify the
accumulated error, indicated as a percent of full batch weight, required to trip a change.
For example, when set to 30 on a 200 series blender, this would indicate a 600 gram total
error must accumulate before adjustment, 30 percent of the full 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