OVERLOAD OUTPUT DISPLAY/ALARM FOR ROLLING MILL MOTOR

摘要

PURPOSE:To provide an overload output display/alarm for mill motor which can confirm that the output from an overload protector does not exceeds a predetermined level within a range where trip does not take place. CONSTITUTION:An overload protective circuit 1 actuates a timer based on a temperature rise value and produces a trip signal based on comparison between timer output and a reference signal. A circuit 3 for amplifying the timer output, a circuit 4 for converting an analog signal into a digital signal, and means 5 for displaying an overload output based on the output signal from the circuit 4 are also provided. Furthermore, means 6 for deciding whether the overload output exceeds a level set by an alarm setting means, and a relay circuit 9 for actuating an alarm based on an overload output decision signal are provided.