| 摘要 |
<p>PURPOSE:To prevent a semiconductor relay from damaging and operating erroneously by storing in advance operating patterns corresponding to the operations of the normal, reverse operations and the stop of a motor and command values of the rotating direction and the speed of the motor in a programmable read-only memory. CONSTITUTION:The address selecting terminal of a semiconductor memory 5 of a programmable read-only memory for storing operating patterns corresponding to the normal, reverse operations and the stop of a motor 3 and patterns of command values of the rotating direction and the speed of the motor 3 is connected to the output terminals of a digital signal generator 1 and an external counter 6, and control input terminals A-D of semiconductor relays 2a-2d for driving the motor are connected to the outut terminal. The addresses for storing the operating patterns corresponding to the operations are selected by an address selection signal outputted from the digital signal generator 1 and the external counter 6.</p> |
