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This doesn’t look like a simple pressure or temperature limit issue. The fact that damage only occurs in the 0 to 25 percent range strongly suggests a flow related problem at low opening. At that position, the valve likely sees very high local velocity and jetting across the seat due to the high...

Thanks for sharing that PDF and for the kind words about the simulator. That’s a great HVAC-focused reference and a nice example of how the same pneumatic fundamentals apply across different industries. While the simulator isn’t industry-specific by design, the core concepts it demonstrates are...

It does sound like either a power-distribution issue on that section of the rack or a partial communication loss that ToolboxST isn’t catching. Since the VCMI ATTN LED is blinking, I’d start by checking the VCMI → PCMI power path and the backplane voltages on that slot. A VSVO with RUN off but...