Forced operation of system interlock valves
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The valves controlled by the instrumentation program operate according to a predetermined sequence; usually, they follow a fixed set of instructions. When there are issues with the execution of these instructions, the process cannot proceed. In such cases, it is common to contact the instrumentation DCS to force power to be supplied to the valves. What is the reason for this? ????????????????Generally, driving valves is done through programs. When testing a valve individually, the instrumentation is used to supply power to the valve separately, with adjustments made via the control system. How is this configured in the instrumentation backend? I hope fellow sailors can give some guidance
No, it’s a set of procedures, so coercion is necessary. I don’t know how this coercion is carried out, and what is the reason for such actions?
This post was last edited by CHANGBAISHI on 2020-3-31 16:41. It depends on the specific requirements. For example, the program controls this valve to open when powered, but it fails to open as required by the program due to a fault. This requires analyzing the reasons why it cannot be enabled. Oh, it also differentiates between electric valves and pneumatic valves here. If it is a pneumatic valve, and the issue lies with the solenoid valve, it can be manually controlled by applying power, as there is a control knob on the valve body. The power needs to be turned off to remove the plug. If a component of the solenoid valve is damaged, it is possible to close the valve when a power loss occurs, and then replace the solenoid valve. There are also issues with the control plugins; it would be best to have a schematic diagram or some partial footage available for easier discussion. As for the backend settings, they involve programming prior to leaving the factory. Usually, the manufacturer provides instructions, or there are several options for organizing training at the company.
Well, I guess I didn’t explain it clearly enough and everyone didn’t understand. Normally, the operation of a vehicle follows a set sequence; it’s not possible to operate any valve individually when the conditions aren’t met. Only when the conditions are satisfied can operations be carried out according to the established sequence. When we need to adjust any valve individually, the DCS operators supply power to that valve forcibly, allowing the process engineers to adjust it. I would like to ask the experts here: since these are valves controlled by the instrument DCS safety system, why is it possible to force them to operate? How can it be forced? What is coercion? After forced activation, the valve will no longer participate in the system interlock