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Old 12-15-2009, 02:07 AM   #61
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Older air compressor wiring help


I think that works but I think you meant to say air pressure switch cycles the starter coil powering the compressor motor.

Seems though you would not have to have two circuits if you have a relay. If you put the oil pressure switch in series with the control circuit on L1 and then wire the relay to the start switch. When the momentary start switch is pushed closed it closes the relay contact which is then held closed being in series with the stop button. Then connect the relay to one pole on the pressure switch then the other side of the pressure switch to the starter coil NO contact. Connect L2 to the other pole of the pressure switch (if two pole) and then the other side of the pressure switch to the closed contact of the OL then other side of OL to the other side of the starter coil. The pressure switch is now in series with the closed (latched) contact and will cycle the motor. Pushing the stop button deenergizes the relay coil and drops the starter coil out. The pressure switch can no longer cycle the compressor.
This might actually be what your saying only my way of explaining it. Anyway the oil pressure switch opens the latched circuit on L1 if the mechanical shaft allows the oil level switch to open and this drops the relay coil out and consequently the starter coil. Until the oil is filled the motor cannot start.

Gosh I'm rusty at this stufff.....

You know we would ruin our fun but a simple on off switch would be a lot less headache .... Rob is laughing at us....

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Old 12-15-2009, 11:59 AM   #62
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Older air compressor wiring help


the MS in the circle is the coil for the motor starter. the air pressure switch does cycle the motor starter. the upper line has an aux relay. that circuit is designed to allow the run circuit to stay energized when the air pressure circuit cycles.

as to the oil pressure switch: you could put it anywhere in the top line except the mainline between where the paralleled branch than contains the contact for the relay (R1-1) taps off and back on. All that is to do is the same thing the stop switch does; open the holding circuit and allow the relay to drop out. I put it in series with the contact R1-1 simply because that is my preference.

actually, if you put it in the lead of that circuit (in immediate series with the stop button), it would be better since, the way I have it, you could push the start button and the motor would run until you released the start button. If you put it on the mainline, it would prevent even that amount of start.

and you are going to have to draw the rest. You know what they say about a picture being worth a thousand words.
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Old 12-15-2009, 01:19 PM   #63
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Quote:
and you are going to have to draw the rest. You know what they say about a picture being worth a thousand words.
Why is it that I knew you were going to ask me that.....

Ok, I'll draw your circuit and post it in a day or so.

Have a good day
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Old 12-15-2009, 02:20 PM   #64
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This is my simple drawing for the DIY OP.
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Old 12-15-2009, 02:26 PM   #65
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Older air compressor wiring help


include a maintained on/off switch (toggle would be fine) rather than the momentary stop switch and that will work. That is what some/many/most (take your pick 'cuz I didn't keep track) have suggested. That is s simple 2 wire control and is fine.


Not like mine will but it will work

I just like to make things the average guy cannot work on. Job security and all.

boy that drawing looks familiar


whoops! I see you did label the switch as maintained. I just saw the diagrammatic representation which is of a momentary switch.
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Old 12-15-2009, 02:49 PM   #66
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Yep.. and a simple maintained on / off is really all you would want. If you look at the cover door for his contactor you will see the provision for an on / off on the left of the cover. In the center is the reset for the overload contact and to the right is the provision for a 3 wire control momentary start / stop. This is standard for this starter. In order to get the 3 wire control to work in an air compressor application is to add a relay. 3 wire control has a lot of advantages but I would say in a residential garage for a home owner it would not be what you would want...too hard to troubleshoot for someone not familiar with how the circuit is built. In the OP's case as I said earlier I want a way to stop the compressor located at the compressor. Rob gave the simple solution early on in this thread. Me .. I would get the optional maintained on /off control buttons and install it in the cover of the motor starter.
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Old 12-15-2009, 03:43 PM   #67
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Quote:
Originally Posted by nap View Post
include a maintained on/off switch (toggle would be fine) rather than the momentary stop switch and that will work. That is what some/many/most (take your pick 'cuz I didn't keep track) have suggested. That is s simple 2 wire control and is fine.


Not like mine will but it will work

I just like to make things the average guy cannot work on. Job security and all.

boy that drawing looks familiar


whoops! I see you did label the switch as maintained. I just saw the diagrammatic representation which is of a momentary switch.
Kudos to nap. That is his drawing that I edited. I can barely use Windows Paint. Nap also had a fine schematic that would have worked just as good. Please excuse the fine print. Like I said I am not very good with the drawing program.
Thanks for the help with "Paint" nap
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Old 12-16-2009, 01:18 PM   #68
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I won't say a thing about your abilities with paint...a simple program to use..sorta on the level with solitaire.... My little 4 yr. old nephew is bored with it, my 6 year old cousin thinks it's stupid ..... when there is auto cad....


...as I was saying NAP and I are discussing a 3 wire control that will latch and hold the run circuit for an air compressor using a momentary start/stop station. The circuit must also allow the air pressure switch to cycle the motor/compressor and let an oil level shutdown kill power to the air compressor by breaking the latch circuit.

Anyway here is my diagram on how I think it could be done...... I would suspect there are several ways to accomplish this scheme.

EDIT: In the original drawing I had an error in that I had no L1 power source for the starter coil (wire on wrong terminal of relay). NAP caught this error and brought it to my attention ... soooo .... the drawing has been corrected. NAP suggested using a second contact in the relay where I am just jumping the relay from the run circuit to latch the relay coil.
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Old 12-16-2009, 01:55 PM   #69
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I wouldn't want to leave out JV's circuit ......
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Old 12-18-2009, 09:21 AM   #70
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1. Do I have the heater in the proper place and right side up? Didn't come installed.

2. Do the pressure switch and the low oil cut off go in series on the dotted path with the on /off switch?



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Old 12-18-2009, 09:44 AM   #71
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Older air compressor wiring help


That's exactly how the heater goes in. Just remove the two screws, drop it in place, and put the screws back in.

The pressure switch, low oil switch, and on-off switch are all wired in series where the dotted line is. It's not critical as to which ones goes where, but I'd connect the on-off to L1, then the others. Slightly safer that way.

Wirenuts are OK to use inside the starter enclosure to connect the control switches.

Rob
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Old 12-18-2009, 10:50 AM   #72
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lash, what kind of switch do you have to turn this on and off? the drawing is showing a momentary contact switch, which is not going to work with the system you have.
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Old 12-18-2009, 01:39 PM   #73
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I don't have a switch yet but my plan is to go with MM idea of a light switch. I understand it must be a two pole switch. correct? Would it be alright to add it inside the box and just cut out a hole for the switch lever?
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Old 12-18-2009, 02:41 PM   #74
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Hello Lash

Can you down size the image a tad ?

You just need a single pole light switch. See drawing below. What we are doing here is is putting the oil switch, the air pressure switch and the 'off" switch in series with the control / run circuit that pulls the starter coil in ... closing the motor contacts and running the compressor. As long as the switch is 'on' the pressure switch will cycle. Open the switch and the coil drops out opening the motor contacts stopping the compressor motor. Or if the oil micro switch opens the starter coil drops out .. till you correct the oil level issue or if the pressure switch opens the starter coil drops out and stops the motor when it closes on low limit it starts the motor again. All of these devices are controlling the coil to pull in the contacts of the motor starter.

The overload (O.L.) will also drop the starter coil out if the motor runs at too high amperage for too long.

I believe this is what Rob is wanting ... it is essentially the same circuit J.V. posted.
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Old 12-18-2009, 09:56 PM   #75
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Stubbies drawing above is exactly correct.

The light switch will enable the compressor to run, when it's on, the compressor will cycle on and off with air usage. If the oil level gets too low, it won't run at all until the oil level switch is reset. When the light switch is off, the compressor won't run at all.

Man, I wish I could draw like that!

Rob

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