[TheForge] O.T-. compressor wiring question

[Darrell]

Bob,
I sent you a direct E mail with a PDF attachment.

Darrell

----- Original Message ----- 
From: "Bob Smolen" <boka at mwt.net>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Tuesday, June 28, 2005 8:47 PM
Subject: [TheForge] O.T-. compressor wiring question


> I bought an older Ingersoll compressor from an estate. I did not see it in
> operation but it looked to be in pretty good shape.. I believe a model
30T.
> It has a 3 phase 7.5 h.p. motor.
>
> To test the unit,I hooked my shop 3 phase directly to the 3 wires on the
> compressor motor and it started no problem. I now want to hook up properly
> and want advice on proper wiring to pressure switch and low oil sensor.
> There is a switch and pressure gauge mounted to the tank. There is also a
> low oil sensor for the compressor pump which is monted on the pump and the
> wired into the switch. There are two sets of wire that were disconnected
> when the unit was moved from the last shop.One set is from the motor and
has
> 3 wires.These are the wires to run the motor which I have verified will
> start the motor when hooked up to shop power. There is also a set of 2
wires
> extending out of the switch (which I will decribe as enter/exit because I
> guess they can lead current into or out of the switch).I do not see where
> any other wires could previouly could have come out of or  entered the
> switch box.
>
> The switch has 4 contacts(I believe) marked line, load,load, line.The oil
> sensor has 2 wires  entering the switch box. One oil sensor wire is simply
> connected to one of the 2 wires that exit/enter the switch. The other oil
> sensor wire is hooked to a "line" terminal.The second wire that
> enters/exits the switch is hooked to the load terminal of the switch.
>
> My uneducated guess is that one of the 3 current source lines  should be
> connected to one of the wires extending from the switch. The other switch
> wire is then connected to one of the wires extending from the motor. In
> other words, current goes into the switch and leaves the switch and enters
> one of the lines connected to the motor. The two remaining wires coming
from
> source are connected to the 2 remaining motor wires. If the oil is low or
> the pressure sensor signals the switch to cut the motor, the one leg of
the
> 3 phase hooked to the switch will  open, shutting down the cuurent in that
> leg and therby shutting down the motor. Does this make sense? If not, any
> suggestions?
>  Thanks,
> Bob
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