FIELD: automatic-control devices. SUBSTANCE: ratio of minimum and maximum current amplitudes in each hunting cycle at asynchronous mode to its maximum value during initial cycle is checked; oscillation period is checked; oscillation cycles are counted; output signal appears at definite proportion of these parameters. EFFECT: provision for tuning away from current fluctuations at short circuits when device should not operate due to introduction of short-circuit tuning unit responding to speed rise above setting value; reduced current amplitude in cycle which prevents unwanted operation of automatic asynchronous-running eliminating facilities. 2 dwg
