A Microcomputer-Based Thyristor Leonard System Having Powerful RAS Functions

The microcomputer-based entirely digital scheme for the thyristor Leonard system is presented. The main processor used is a 16-bit microprocessor. Systematic and efficient use of the microprocessor and microcomputers successfully provides the thyristor Leonard system with the entire digital scheme. This scheme offers not only the high-performance adjustable-speed regulation of dc motors, but also other important functions and features required for the Leonard system, such as system sequencing, thyristor triggering, various compensations for improvement in electric performances, diagnostic, monitoring, and protection capabilities, drift-free characteristics, and so forth. The scheme also serves smoother communications between the microcomputer-based system and a programmable host controller, which supervise a number of Leonard systems. Compact design permits the hardware construction for the digital scheme to be accommodated on a single board.