In the process of automatic control, in case of transmitter failure, switch back to manual immediately.
In case of valve failure, switch back to manual operation and change to field operation.
In case of power failure of the system, it is necessary to switch back to manual mode immediately and ask the engineer to check the condition of the system and put it into automatic mode again after confirming that it is in good condition.
If the DCS operation interface data is not refreshed (the data is refreshed once per second under normal conditions), and the manual and automatic switching cannot be operated, the instrument personnel shall be contacted for maintenance. At the same time, they should go to the site immediately for operation.
In case of system card failure, the corresponding control circuit should be switched back to manual mode, and the instrument personnel should replace the fault card. After checking and confirming that the fault is eliminated, the automatic system can be put into operation again.
In case of abnormal power failure of DCS system, it should be changed to manual operation. After power on again, the engineer is required to check the system condition, check whether the system data such as circuit parameters are normal, and confirm the opening of each control valve. After everything is normal, it can be put into automatic mode again.