FAULT MONITORING CIRCUIT OF SERVO SYSTEM MEASURING INSTRUMENT

摘要

PURPOSE:To simplify the constitution of a fault monitoring device, by providing an input terminal, which introduces a monitoring signal into a servo amplifier or a servo system measuring instrument, in which acceleration is fed back to a pendulum, providing a constant voltage diode pair in parallel with a fed-back element, thereby omitting a monitoring forcer. CONSTITUTION:In a servo amplifier 12, an input terminal 2-a for introducing a monitoring signal and constant voltage diodes 2-b and 2-c, which are connected in parallel with a forcer 1-c of a fed-back element in an oscillating part 11, are provided. Therefore, when a feedback loop is cut by the occurrence of a fault in the oscillating part 11, a monitoring signal is outputted through an oscillator 3 and the terminal 2-a, based on the difference in gain between the time of normal operation and the time of fault, at an output terminal Z as a large level signal. Thus the fault is monitored. In this way, a monitoring forcer is omitted, the output and the fault signal are not required to be separated, and the constitution of the fault monitoring device can be simplified.