Bumpless switching of valve drive in a turbine control system

Details Bumpless switching of valve drive in a turbine control system Bumpless switching of valve drive in a turbine control system

1982-04-15

1985-01-15

Wise, Edward J.

Boots, shoes, and leggings

364184, 364149, G06F 1546, H02P 904

Patent

active

044942087

ABSTRACT:
Outputs of two independent controllers are available to control a valve actuator in a turbine control system. One of these valve drive signals is applied to the valve actuator while the other is applied to a termination. When a fault is detected in the active controller, the secondary controller is reinitialized to eliminate any drift which may have occurred therein to provide a valve drive signal closely equal to a valve drive signal previously provided by the active controller. Switchover is performed placing the previously inactive controller in the active condition and applying the signal from the previously active controller to the termination.

REFERENCES:
patent: 4027145 (1977-05-01), McDonald et al.
patent: 4029952 (1977-06-01), Giras et al.
patent: 4071897 (1978-01-01), Groves, Jr. et al.
patent: 4087860 (1978-05-01), Beatty et al.
patent: 4153198 (1979-05-01), Eki et al.
patent: 4179742 (1979-12-01), Stern et al.
patent: 4251873 (1981-02-01), Joby
patent: 4368520 (1983-01-01), Hwang et al.

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