James R Dix

41047249, Aug 1, 1978

Jun 27, 1977

5/809959

James Allen Dix - Greenfield WI
Marvin A. Guettel - Milwaukee WI
Michael Aslin - Cedarburg WI

Square D Company - Park Ridge IL

G06F 1546
B23K 912

364477

A digital welder control system for controlling a portable gun welder of the type used in the automotive industry on an assembly line. An 8 bit microprocessor is the main control element of the system. The known cycle time of the microprocessor is used to generate a real time delay which in turn is used to generate a digital phase shift heat control. RAM locations in the microprocessor are used to store medium constants of the welding sequence which were previously stored, in prior art controls, in the position of tap switches or thumbwheel switches. The controller provides diagnostics for six common problems often encountered by welder control systems such as override timeout, half cycling, transformer temperature rises, a low water flow, a shorted SCR, and a change in the heat settings. The controller also provides a maintenance interval counter and compensator control having a four-step stepper. The stepper control is used to automatically increase the weld heat after a preset number of welds to compensate for electrode mushrooming.

39507360, Apr 13, 1976

Feb 7, 1975

5/548117

James A. Dix - Greenfield WI
James J. Eckl - Milwaukee WI

Square D Company - Park Ridge IL

G06F 1546
G06F 902

3401725

A programmable signal processor having solid state components which can be programmed to duplicate the control functions of an electromechanical relay panel. The processor includes an AND memory matrix having a plurality of individual inputs and outputs which are connectible through diodes to outputs of solid state gated input memories and through jumpers to inputs of solid state gated feedback memories. The input memories have inputs which are switched by external inputs to the processor. The feedback memories are switched by outputs of the AND memory and provide input signals to the AND memory which simulate the signals provided by normally closed and normally open contacts of a relay. The outputs of the AND memory are selectively connected through wire jumpers to the inputs of the feedback memories and circuits which control the outputs of the processor so the feedback memories and output circuits of the processor will switch in response to outputs from the memory in an OR logic manner. The combination of the AND logic functions provided by the AND memory and the OR logic functions provided by the jumpers permits the processor to be programmed using Boolean logic equations or directly programmed from a conventional relay schematic or ladder diagram without using special programming language.