Picked up a Quincy QR-210 duplex compressor

[bsaint]

I've been on the hunt for a new compressor but I didn't want 5hp and I wanted more than 1-1/2. Well just my luck I find a Quincy duplex machine. I was going to offer him lower but it was a good deal and he loaded it for me with his bucket loader. I got it for $200.

This is how it looked after I gave the tank a good cleaning and I changed out a broken gauge. Pumps wont be cleaned until I go through them but I will run them for now. The ad said the one connected was a 1-1/2hp and the other motor/pump weren't connected. Turns out it had a 1hp and a 2hp motor. But as you can see even for a 1hp, the pulleys were too small. I found in my stash of stuff the right size pulley for a 2hp so that's what it gets (green motor.) Im selling the 1 hp and will put the money towards a used 2hp for the other side. I hooked up the drain and outlets. A lot of bent 1/4" tubing will need to be replaced and the right belt ordered. But I am pretty happy. What's nice is I made a PLC controlled duplex pump controller a few years ago that I am going to use for this unit. So normally I will have the electric bill of running a 2 hp and when I need more air I will have 4hp. My plan is to change the plumbing some and add a common manifold for control air and pressure switches. I have a belt guard for one side but will need to find something similar for the other. I have a 2 and 4 year old who help me in the garage.

 

[930dreamer]

Did the setup come with the electrical hardware i.e. the motor alternating circuit?

 

[bsaint]

Did the setup come with the electrical hardware i.e. the motor alternating circuit?

Nope, I have all that stuff. Even if it did, I would've tossed it. The off the shelf alternator circuit does not allow you to remove power from one pump without killing the control voltage to the alternator.

 

[930dreamer]

How difficult is it to build a new duplex starting system?

 

[bsaint]

That is the one Im talking about where you can kill power to one motor to service the other, but when you kill the power to the opposite motor, it kills the power that controls the alternator. This is the one I designed and built. Its standalone. It sends control signals to two separate motor starters. But only a bigger panel would be required to fit two starters along with the control.

 

[md21722]

Nope, I have all that stuff. Even if it did, I would've tossed it. The off the shelf alternator circuit does not allow you to remove power from one pump without killing the control voltage to the alternator.

It really depends on how you wire it. Conventionally I have seen

(1) One power source for alternator and both motors

(2) Two power sources, one used for control and motor "A", and another circuit used for motor "B"

But there is no reason you can't use a $30 relay and do

(3) Three power sources, one for control, one for motor "A", and one for motor "B"

 

[bsaint]

Well lets see your schematic. Plus Id love to see a $30 alternating relay. Prob real good quality.