JPS57182210A - Controller - Google Patents

Abstract

PURPOSE:To eliminate deviations in location of a moving body from a location target value, by calibrating stored values of locations read out from a memory according to the ratio of the difference valve between the nominal and actual supply voltages of the potentiometer read out from the memory to the nominal maximum location target valve. CONSTITUTION:When a controller 1 is operated, a nominal supply voltage value (b) of a potentiometer 9 is read out first as a pulse voltage from a memory 1 by an output signal (a), and the value (b) is added to an input terminal of an amplifier 5 through an arithmetic device 3 and a DA converter where the value is converted into an analog value. When the voltage of a power source 10 varies, a difference value (d) is inputted into the arithmetic device 3 after it is converted into a digital value at an AD converter 6. The arithmetic device 3 performs calculations shown by an expression (1) for a location target value (f) read out from the memory 1 based on the output signal (g) of the controller 2, and the result is added to an input terminal at one side of a servo amplifier 7 through the DA converter 4. Therefore, a servo current (i) flows and drives a servo mechanism 8, and, when the potentiometer 9 works, a returning amount (j) which will be inputted into the servo amplifier 7 changes in the direction in which the amount (j) coincides with a working target value (h).