MAGUIRE Gravimetric Gateway LineMaster Installation Operation & Maintenance page 16

LineMaster
XC-3 LineMaster
Monitors throughput and line speed. Adjusts extruder and line speed to maintain product weight
per length. Requires XC-C LineMaster computer controller and is typically used for multi-layer co-
ex applications.
Computer
XC-LMC
aspc0910
XCD-X
M
Drive Speed Control
Component Installation
The system is comprised of a mass flow hopper assembly, a controller with operator interface, an
extruder drive speed control package, a line speed control package and an encoder. The
LineMaster XC-LMC computer control is required for simultaneous control of both extruder drive
speed and line speed.
The mass flow hopper is mounted on the throat of the extruder. A weigh hopper suspended from a
set of load cells provides the material flow data to the LIW controller. The line speed control
package, which includes a digital potentiometer to replace the existing analog take-off speed pot,
is mounted in the control cabinet and monitors and controls the signal to the take-off drive. The
encoder or pulse generator is mounted on the haul off to monitor the speed of the line. The
extruder drive speed control package, which includes a digital potentiometer to replace the
existing analog extruder speed pot, is mounted in the control cabinet and monitors and controls
the signal to the extruder drive. The two drive controllers communicate to with one another to
provide a synchronous ramp of all drives as directed by the LineMaster XC-LMC computer.
Principal of Operation
The XC-3 Extrusion Yield Control System is designed to maintain a products weight per length
(yield) by monitoring the material consumption of the process through the mass flow hopper on the
throat of the extruder in kilos per hour, and collates the data with the line speed monitored by an
encoder mounted on the shaft of the haul off in meters per minute to provide a calculated actual
product yield in grams or kilograms per meter. The actual yield is compared to a desired target
yield of the product entered on the LIW controller. The LIW controller communicates to the XCD-X
Extruder Drive Speed Control which adjusts the voltage or reference signal to the extruder drive to
increase or decrease with respect to the line speed to maintain the desired yield.
Digital potentiometers replaces the existing rotary drive speed control on the take-off drive and
extruder drive and communicate with the XCD-T Take-off Speed Control and XCD-X Extruder
Drive Speed Control which is mounted in or on the control cabinet and is connected to the LIW
controller.
Typical Start-up
®
Yield Control – Extruder & Take-off Drive Control
aspc2510
LIW
EXTRUDER
Line Speed Control
XCD-T
aspc2210
M
Encoder
XCE-01
Maguire Products, Inc.
Product
16