[TheForge] O.T-. compressor wiring question

[Bob Smolen]

Darrel,
Thanks. Unfortunately, my ISP puts a filter on so I dont get attachments.
Bob
----- Original Message ----- 
From: "Darrell" <darrell at machinemaster.com>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Wednesday, June 29, 2005 8:52 PM
Subject: Re: [TheForge] O.T-. compressor wiring question


> 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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