PLC control pressure
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The pressure of the Siemens S-200 system regulates the tank, and the pressure fluctuates greatly. The pressure transmitter used is Rosemount 3051 model. The valve is a pneumatic control valve that is normally closed. There is no electrical equipment around. I added a signal isolator and it still fluctuates. The cable is KVVP2.* 1.5, please tell me how to stabilize the pressure? Thanks!
Check the PID tuning parameters. If there are no other problems, it is probably this problem.
There may be several reasons as follows: 1. First of all, the PID control algorithm of S7-200 is not that powerful. Of course, you should pay attention to PID parameter 2. You can increase the damping coefficient of the on-site transmitter, which can be set to 1.5-2 seconds (the setting depends on the damping coefficient of your transmitter)
In addition to what is said above, pay attention to check whether there is any poor wiring contact in the circuit and whether the signal cable is well insulated from the ground.
1. Do not use automatic adjustment first, use manual adjustment first. 2. Confirm whether the output of the regulating valve is stable and troubleshoot step by step.