1. Check whether the impulse tube and circuit wiring related to the control loop are correct, such as whether the impulse tube is leaking or blocked; for the circuit, first check whether the insulation resistance and grounding meet the requirements, whether the power supply is normal, and whether the wiring Correct, whether the fuse meets the regulations; check whether the output signal of the measuring element and transmitter is normal, what is the working state of the actuator, whether the valve can be normally opened and closed, and whether the valve position signal is correct.
2. For a single control loop, first set the controller setting to internal setting, and adjust the setting value to a predetermined value; the positive and negative effects are set correctly as required, the proportionality is set to the predetermined value, the integral is set to the maximum, and the derivative is set to zero In order to facilitate the adjustment of the controller parameters, the proportionality can be enlarged.
3. Manual operation first. The manual operation here refers to the operation on the controller, that is, the remote control valve is operated manually until the working condition is stable, and then it is switched from manual to automatic, and the switching between manual and automatic is required to be performed smoothly and quickly. , That should be a disturbance-free switch, that is, the automatic current should be able to track the manual current well, that is, the output of the controller should remain unchanged before and after the switch to avoid human interference.
4. After switching to automatic, the P, I, and D parameters should be adjusted according to the actual situation until the adjusted process parameters meet the requirements; for the controller with self-tuning or artificial intelligence, you can directly switch on the self-tuning. After entering the automatic system, you should observe the dynamics of the system until everything is normal.