How to wire 2 start stop stations for a 3ph motor.

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Do you know how to wire a single three wire stop start station?

If so then wiring multiple stations will not be much harder - just need to put all the stop buttons in series and the start buttons in parallel.

If you don't already know how to wire a single three wire stop start station this may not be so easy to explain without diagrams.
 
JBjimbo said:
Good evening!

Would anyone be willing to help me with wiring 2
start stop stations for a 3ph motor?

Thanks!
Click to expand...

In case the other answer is a little to direct...

Think of the start switches and the stop switches as two separate items with separate wiring. Either of the stop switches must interrupt the current to the motor starter coil momentarily, so the wire must go from the source, through one stop switch, which is normally closed and then from that switch to the other switch, through it to the starter. (I.E. series) During motor run, the current to keep the starter coil in uses this route also going through an auxilliary contact and the overload contact on the starter and returns to the source (panel, control transformer, etc.) along the common. So any one of the contacts, overload, auxilliary, or stop opens, the motor starter will open and the motor will stop.

Either Start switch must provide momentary current to the starter coil to pull it in allowing the above contacts to all close, maintaining the power to the coil. In order to do this, the current must be available at one side of both start switches which are normally open, at all times. (parallel) When either button is pushed the current then flows to the coil pulling it in.

So to repeat the simple answer. Start contacts in parallel, stop contacts in series.
 
Strathead said:
In case the other answer is a little to direct...

Think of the start switches and the stop switches as two separate items with separate wiring. Either of the stop switches must interrupt the current to the motor starter coil momentarily, so the wire must go from the source, through one stop switch, which is normally closed and then from that switch to the other switch, through it to the starter. (I.E. series) During motor run, the current to keep the starter coil in uses this route also going through an auxilliary contact and the overload contact on the starter and returns to the source (panel, control transformer, etc.) along the common. So any one of the contacts, overload, auxilliary, or stop opens, the motor starter will open and the motor will stop.

Either Start switch must provide momentary current to the starter coil to pull it in allowing the above contacts to all close, maintaining the power to the coil. In order to do this, the current must be available at one side of both start switches which are normally open, at all times. (parallel) When either button is pushed the current then flows to the coil pulling it in.

So to repeat the simple answer. Start contacts in parallel, stop contacts in series.
Click to expand...

Um, Stop button to starter? I would say last stop button to start switches, then​ to starter coil.(unless its going to a VFD or PLC input)
 
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Strathead said:
That isn't really true. Draw it out.
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If you look at the way starters USED to be made, there was the aux contact already wired to one side of the coil ... our panel wiring was

line, stop (NC), start (NO), coil, overload contact (NO held closed), common
 
Strathead said:
That isn't really true. Draw it out.
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Not sure how many 3 wire stop-starts I've drawn and wired, but it's alot! I supose if you stacked your starts first, or if you're just talking about a taking a wire from the stop to the aux contact for the seal in, but I always wire my stops first, then stack my starts with the seal-in, then to the coil.
Okay, won't let me load a constructor file, and the picture is too big dang it! Try again:)
 

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Johnnybob said:
Not sure how many 3 wire stop-starts I've drawn and wired, but it's alot! I supose if you stacked your starts first, or if you're just talking about a taking a wire from the stop to the aux contact for the seal in, but I always wire my stops first, then stack my starts with the seal-in, then to the coil.
Okay, won't let me load a constructor file, and the picture is too big dang it! Try again:)
Click to expand...
Your drawing is the most common way to do it. One could put the stop switches to the right of the start switches or even to the right of the contactor coil and it still would work though, they just need to be in series with the coil somewhere. You could even put one stop switch to the far left and one to the far right and it still would work.
 
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