Siemens valve positioner
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Air-operated valve, Siemens positioner; the DCS control allows the valve position to correspond to values from 0.1% to 100% of full opening. When a setting of 0% is used, the valve opens fully automatically – it has already been self-tuned. If this doesn’t work, has anyone else encountered this issue?
Weird, try adding 4mA right there
Is it because the output current of the card is less than 3.8 mA, which causes it to lose power, that it’s set to full capacity?
The valve shuts down in case of an accident; power loss should result in a complete shutdown
The current when the card is inserted is 1.2 mA, and the corresponding valve operates normally
Measure it: when the DCS is set to 0%, what current in mA is applied?
At 0 degrees of opening, the current is 1.2mA
For the Yokogawa system, the AO output setting is defaultly between -17.19% and 106.25%; it should be changed to 0-100%
The 1.2mA he mentioned happens to match exactly~
In DCS, 0-100 corresponds to 20mA-4mA, right?