Used GA-90 Remote Start/Stop Circuit
by Dennis Vinas
(Batavia, IL. USA)
GA-90 Remote Start/Stop Circuit Diagram
We acquired a used GA-90 SN: AIF .079712 a couple of months ago. I installed the compressor and coupled the outlet port to 2-250 gallon air-holding tanks (in parallel) and output to a brand new Atlas Copco FX-15 Air Dryer. Compressor has been running seamlessly since I first started it in mid-August/2016.
I ran a remote Start/Stop, E-stop station outside of the compressor room. In remote mode, I can start the compressor but it won't put out any air. I switched back to Local control mode and the compressor puts out air normally as before.
Can anyone tell me what I am missing? I have attached a screenshot drawing for the start/stop and E-stop circuit I added. The E-stop has 2 normally closed contact blocks. The Start pushbutton was initially a momentary NO contact block because the book says not to use a maintained-action button. I switched that to a maintained NO contact when I noticed on my first attempt to start that as soon as I released the start button, the compressor stops. Do I need remote load and unload feedback to the control unit as well?
Thank you for taking the time to read through this.