Patent ID: 6364621
Filing Date: 2002-04-02
Classification: F04B

Abstract:
A controlling apparatus, for controlling at least one vacuum pump, comprising: at least one vacuum pump which includes a pump body for sucking a gaseous body from a room and exhausting the room of the gaseous body and a driving motor for driving the pump body; and controlling means for controlling the driving motor included in each of said at least one vacuum pump, and said apparatusincluding a power measurement device which measures driving power to be sent to the driving motor, and wherein said controlling means switches a state of said at least one vacuum pump from a steady operational state into an unusual event checking state, in which any unusual event in said at least one vacuum pump is detected, when a value of the power measured by said power measurement device is equal to or exceeds a warning value which is higher than a fixed value, and wherein said controlling means controls the state of said at least one vacuum pump from the unusual event checking state into the steady operational state, when the power of the driving power decreases to a safe value, which is lower than the fixed value, during a first setting period which said vacuum pump is in operation in the unusual event checking state.