UPGRADE OF A LOW-LEVEL CONTROLLER OF MAGNET POWER SUPPLY

The experimental equipment, magnets or power supplies, have long lifetimes. In order to effectively use them, it is necessary to update the control system. It thus provides not only efficiency, but also an effective environment for maintaining or improving the work. In the KEK counter experimental hall, the low-level magnet power supply controller consists of a CPU board, IO boards, and ADC/DAC boards. The CPU board has been used for more than ten years, which is equipped with a Z- 80 8-bit CPU. In order to improve the controller performance, a CPU board equipped with 32-bit CPU SH2 (HITACHI, SH2-7045) was designed according to the STD-bus and under testing. Many of the older STD- bus boards have been refreshed. By using a SH2 high speed CPU, the power supply controller has an additional function of current control of the magnet power supply. This paper presents the features of the CPU board and the result of current control.