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What aspect of the exhaust are you trying to control? If you put another valve or flow control on the exhaust port of the main valve, you risk ext/retract happening at the wrong speed - or not at all if the exhaust is restricted. If you just want to control where the exhaust takes place, you can...

Your VFD is creating a pulsed DC output that is effectively simulating an AC output voltage, it's not stepping it up or down from input to output. If the VFD is rated to accept the input of 230V/50Hz (which it appears that it is according to your specs) it's going to convert it to a DC bus...

To address the original question: defining proportional band and also comparing it to proportional gain, here is an article that explains some of the details, if anyone is in search of a bit more background information in addition to all of the great responses posted here...

Don't think about IoT like 'How can someone help me set up an IoT project?' As noted above, it's a generic term that includes a ton of technologies for a ton of different reasons. Instead, you need to choose a purpose as your end goal, like what do you want to accomplish? Then you begin looking...

I like those Fuji ones, but they do need the aux contacts... https://www.automationdirect.com/adc/shopping/catalog/motor_controls/iec_magnetic_contactors/auxiliary_contacts/sz-a11t...

A schematic would definitely help. The old contactors most likely have internal wiring to complete the A1 coil circuits, because you do need something at both A1 and A2. Probably (again, schematic to verify, I do not know the setup for certain) the NC 22 from each old contactor receives the...

I guess asking which is most important is a pretty simplistic way to ask a question, since every situation is pretty different from the one before it, so everyone will have a different take. Like asking which car part is most important. The screwdriver vs voltmeter options always seemed to be...

For anyone curious to learn more about this topic of wet vs dry contacts (with the dry contacts being another term for these voltage-free or sometimes potential-free contacts), Control.com published an article. If you would like to learn more, I'd encourage you to check it out. Wet vs. Dry...

If you want to learn more about HART and a current example of PLC implementation, we recently published a Control.com article explaining the fundamentals. It doesn't cover every scenario and use case, but if you want to gain a little better understanding, I'd encourage you to check it out...

We published an article a while back comparing wet and dry contacts, which is essentially the same concept as contacts with or without potential (voltage) applied. You can check that out here, and I hope it helps if you visit this thread and need more information! Wet vs. Dry Contacts: Knowing...