SERVO CONTROL FOR MOLDING MACHINE

A method and apparatus are provided for servo control of injection molding machi ne (10) devices (12, 14 and 16). A signal processor (104) periodically produces analogue control signals for controlling m achine mechanisms at a first loop closure interval and periodically produces digital control sig...

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Bibliographische Detailangaben
1. Verfasser:	TOPMILLER, DAVID ALLEN
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION COMBUSTION ENGINES CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING FUNCTIONAL ELEMENTS OF SUCH SYSTEMS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES LIGHTING MECHANICAL ENGINEERING MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PERFORMING OPERATIONS PHYSICS REGULATING SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES TRANSPORTING WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A method and apparatus are provided for servo control of injection molding machi ne (10) devices (12, 14 and 16). A signal processor (104) periodically produces analogue control signals for controlling m achine mechanisms at a first loop closure interval and periodically produces digital control signals for controlling energization o f machine heaters at a second loop closure interval. Values of analogue and digital control signals are determined according to contr ol algorithms relating set point values and measured parameter values. Calculation of values of analogue control signals inc ludes calculation of a first command value according to a first control algorithm, calculation of a second command value according to a second control algorithm and selection of the lesser of the first and second command values. Compensation for "cold" therm ocouple junctions (162, 163, 16a) created at the connection of remote temperature sensing thermocouple leads and the signal proce ssor interface circuits is provided. DC output interface circuits (528) including two stage over-current protection are provide d.