GB1448121A - Continuous electronic controller with circuit components for mechanical switching - Google Patents

Abstract

1448121 Automatic control systems HARTMANN & BRAUN AG 27 Nov 1973 [11 Dec 1972] 54870/73 Heading G3R A controller has an element 6 mechanically switchable between P and PD behavior in parallel with another element 7 mechanically switchable between P and I or P and PI behavior. In the embodiment an unspecified deviation signal Xw is proportionally amplified at base 1, and a control signal y is produced by combining the outputs of 6 and 7 in box 8, which has an adjustable limiter 30, 31 and adjustable threshold bias 32, 33. In element 6, with switch 9 open proportional behavior is produced, set by gauged potentiometers 11, 13 and with 9 closed capacitors 16, 17 provide a differential term without affecting the magnitude of the P setting. Switch 15 shorts an attenuating resistor 18 if this is not required. In element 7, with switch 20 open, capacitor 20 produces integration but with it closed 24 is in parallel with resistor 25, producing P action with a time lag of first order. In an alternative version of the element 7 Fig. 3 (not shown), proportional, action is always present and I is added by opening a switch (51). An alternative version of element 6 is also described Fig. 2 (not shown). Manual control by a potentiometer 34 may be effected by closing switch 19; since this supplies control voltage to the integrating amplifier changeover occurs without shock.