The power board of the intelligent locator is burned out
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I have 5 control valves here, of which 2 are intelligent positioners and 3 are mechanical ones. These 5 units suddenly stopped working. The mechanical positioners were able to function again after some time, but the power board modules of 2 of the intelligent positioners were damaged. By bypassing those power board modules and connecting directly to the 4-20mA input wires inside, the positioners were able to continue operating. The safety barrier I use is of the Zener type; the DCS version is an older model with centralized control. I now want to analyze the reasons for the failures that have occurred
Check whether these 5 control valve AO circuits are from the same module
It’s not the same card; there are 3 cards. Two of these intelligent positioners are located in one card. The voltage in front of the Zener-type safety barrier is 16 V, while the voltage output at the back side is around 9 V, which is also higher than the voltage on the output side of other safety barriers
The normal operating voltage should be between 1-5V, right?