The 10 HP compressor is now in my yard. Looking good, but needs a little cleaning.
I will hopefully receive the VFD on Friday or so. It is a Siemens SED218.5 kW rated drive. Assuming it works, I have to set its parameters and here's where I need a little bit of wisdom.
Specifically, my question is how do I set the acceleration ramp-up so that it works nicely with the unloaders. My own thinking is that I should accelerate slowly almost up to the speed when unloaders kick in, and then accelerate as fast as I can once unloaders do kick in and the pump starts pumping. Any idea what is the speed when unloaders kick in?