초록 ▼

An improved method for automatically controlling the rate of mass flow in a system having a mass mover powered by a power supply which is attenuated by a control device for transferring mass through a conduit, wherein a signal proportional to said mass flow is transmitted to an automatic control uni

An improved method for automatically controlling the rate of mass flow in a system having a mass mover powered by a power supply which is attenuated by a control device for transferring mass through a conduit, wherein a signal proportional to said mass flow is transmitted to an automatic control unit, characterized by the improvement among others, whereby the improved automatic control unit is provided with a process control mode in which new operating conditions are entered into the program, and the automatic control unit determines the correct mode of control for the new process conditions.

대표청구항 ▼

An improved method for automatically controlling the rate of mass flow in a system having a mass mover powered by a power supply which is attenuated by a control device for transferring mass through a conduit, wherein a signal proportional to said mass flow is transmitted to an automatic control uni

An improved method for automatically controlling the rate of mass flow in a system having a mass mover powered by a power supply which is attenuated by a control device for transferring mass through a conduit, wherein a signal proportional to said mass flow is transmitted to an automatic control unit, characterized by the improvement which comprises, in combination; (a) entering in said automatic control unit a standard signal, Sa, representative of a desired rate of mass flow in said conduit, (b) entering in said automatic control unit a rate of mass flow deviation range, K1-K2, (c) entering in said automatic control unit an initial operating voltage, V, and transferring a signal proportional to said V to said control device to operate said mass mover while in automatic control mode to attenuate said power supply to said mass mover, and to produce a rate of mass flow in said conduit at said initial operating voltage, V, (d) obtaining a first signal, S1, proportional to the actual rate of mass flow in said conduit, and conveying said first signal, S1, to said automatic control unit, (e) comparing said Sa with said S1 in said automatic control unit and calculating a difference, D, between said Sa and said S1, and comparing said difference, D, with said mass flow deviation range, K1-K2, (f) when said difference, D, exceeds said mass flow deviation range, K1-K2, switching said automatic control unit to a mode of fixed value, and thereafter transmitting a signal proportional to said initial operating voltage, V, to said control device to operate said mass mover at a fixed signal value.