| 摘要 |
A method for monitoring operation of a valve assembly, the valve assembly comprising: a valve element movable between an open stop and a closed stop, wherein a position of the valve element between the open stop and the closed stop establishes the extent to which the valve is open. The valve assembly further comprising: a DC motor for moving the valve element in response to an electric signal; a position sensor for detecting an actual position of the valve element; and a controller configured to receive data corresponding to a desired position of the valve element, and to supply a calculated electric signal to the DC motor in order to effect movement of the valve element from the actual position of the valve element to the desired position of the valve element. The method comprises: measuring the electric signal output from the controller for input to the DC motor when the valve element is stationary, and comparing the measured electric signal output from the controller with a reference electric signal in order to identify a fault. Also, a controller for monitoring operation of a valve assembly, the valve assembly comprising: a valve element movable between an open stop and a closed stop, wherein a position of the valve element between the open stop and the closed stop establishes the extent to which the valve is open. The valve assembly further comprises: a DC motor for moving the valve element in response to an electric signal; and a position sensor for detecting an actual position of the valve element. The controller comprises: an electric signal controller configured to receive data corresponding to a desired position of the valve element and to supply an electric signal for input to the DC motor in order to effect movement of the valve element from the actual position of the valve element to the desired position of the valve element. The controller further includes: a position data receiving portion configured to receive valve element position data from the position sensor and determine that the valve element is stationary; an electric signal comparator configured to compare the electric signal output from the electric signal controller with a reference electric signal in order to identify a fault; and an indicator configured to indicate whether the electric signal output from the electric signal controller is above or below the reference electric signal. |
