Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1982-06-18
1984-03-13
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318600, 364476, 165 12, G05B 1924
Patent
active
044370466
ABSTRACT:
An extrusion drive control system for control of extrusion process machinery driven elements. A drive interface unit is adapted for use with any of a variety of drive motors and regulators. The interface unit accepts analog condition information signals from the drive motor and regulator, having any of a plurality of predetermined input characteristics, and provides corresponding digital signals having characteristics that are invariant with respect to the particular input characteristics. The interface unit has a communication channel for receiving digital control signals and for outputting digital signals indicating drive operating conditions. The low power digital circuitry and communications channel are protected from the high voltage and high power connections to the drive and drive regulator.
Extrusion control means comprises the interface unit together with a drive control module, which permits input of control signals including speed set and ratio set, and permits display of at least one of the operating conditions. The drive control module has an internal data bus and a communications channel connected to the data bus and to the interface unit communications channel.
For the control of an extrusion line process, having a plurality of driven elements which have related desired operating speeds, a control system comprises a similar plurality of extrusion control means, all connected to a controller, together with another drive control module for the input of a line speed setting. The controller responds to the input line speed setting and the operating conditions of the driven elements to output appropriate digital control signals to the driven elements to control them to operate at the desired related speeds. The interface unit outputs appropriate analog control signals to the drive units.
REFERENCES:
patent: 3825735 (1974-07-01), Bowers
patent: 4094940 (1978-06-01), Hold
patent: 4120630 (1978-10-01), La Spisa et al.
patent: 4388576 (1983-06-01), Blatt
patent: 4392195 (1983-07-01), Inoue
patent: 4402721 (1983-09-01), Ericson et al.
Crompton & Knowles Corporation
Dobeck B.
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