| 摘要 |
PROBLEM TO BE SOLVED: To arrange a converting means for converting an AC signal into a DC signal together with a display unit in a sealed container installed in a terminal box of a canned motor by constituting the converting means simply in a small size. SOLUTION: The operation monitoring apparatus for a canned motor comprises a converting means 50 for converting an AC signal into a DC signal, and an integrated circuit IC for converting the DC signal converted by the means 50 into a signal of DC4 to 20 mA. The circuit IC has an auxiliary amplifier A7 operating by a single power source. The means 50 has a non-inverter amplifier having the AC signal the amplifier A7 of the circuit IC to half-wave rectify the AC signal, resistors R5, R6 for dividing an output voltage of the non-inverter amplifier, and a capacitor C2 connected in parallel with the resistors R5, R6 to filter the voltage-divided output signal to a DC signal. The circuit IC and the means 50 are arranged together with a display unit 51 in a sealed container installed in a terminal box of the canned motor. |
