Can anyone tell me how to wire up a 3 button reversing switch . It has Forward ,reverse and a stop button . It is a Siemens 50MA3KLE switch. I got it from McMaster Carr. I called Siemens and ask for a diagram but they were no help .Thanks Mirage
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Mirage,
I can't give you a specific part number but may be able to head you in the right direction. I think the easiest method would be to use a standard drum switch but if you could find a toggle switch rated for the appropriate ampacity and HP it might work.
I think drum switches work great. They have a comfortable handle for smooth actuation, they are usually adequately HP rated and seem plentiful on sites like eBay.
Whatever you get it must be a maintained type switch and have enough poles to switch the proper motor leads to achieve reversal. I hope this helps.
Stuart
1)b think what I have on the lathe is a "split phase" electric motor; it is very heavy old cast iron "7M" case Century brand and does not have capacitor "bumps" but it runs smoother than any others I have. would like to continue to use it with a "reverse drum switch"+ i already have it.Some issues:
1) One problem with 1 phase motors as opposed to 3 phase is that they are not all the same, there are several methods of making 1 phase motors work. Most (but not all) 1 phase motors that are cap-start/cap-run, or cap-start/induction run, or split phase can be reversed because you typically have the wires for the caps and/or start windings separated from the run winding wires. Some PSC (Permanent Split Capacitor) 1 phase motors don't provide the separation of the wires, so you can't reverse them. For the most part PSC motors aren't used in machine tools so they aren't going to be a problem. But depending on the manufacturer's willingness to allow access to connections, you may not be able to reverse every 1 phase motor.
1)b below
2) You cannot use momentary buttons to directly change directions in motors. Momentary buttons control contactors, and the CONTACTORS change the power wiring to reverse the motor.
2)b below
3) Maintained contact push buttons are now rare. They were considered dangerous because they could be too easily misapplied in place of momentary push buttons and they looked exactly the same. Most mfrs have dropped the concept.
3)b below
4) Drum switches are the preferred method to accomplish manual reversing. This thread provides excellent information on reversing 1 phase motors with a drum switch.
http://www.practicalmachinist.com/v...wiring-single-phase-motor-drum-switch-157819/
4)b below
5) When Siemens fought Furnas 20+ years ago, they dumped off the Drum Switch products and sold the rights to Hubbell Industrial Controls but if you call Siemens now, there are no longer any employees left that know this. HIC now makes and sells them and still use the Furnas name, if you download the catalog they are a good source of wiring diagrams. Hubbell Industrial Controls :: Furnas Brand Class 58 Drum Switch - Type 4258
is this a non reversable motor or....
You have a real antique. Check the internals inside to see if you have a 'repulsion start-induction run' motor. They will have a commutator and brushes with the brush holder rotated to reverse direction. They were popular before the capacitor style was built.
JRW
My best answer is a rude question:
Does the dataplate say "Reversing", or "Reversible", or "to reverse rotation"?
Of course, no dataplate says "Cheap Chinese", but some are....
An engineer might be able to pull a proverbial rabbit out a hat, but I suggest abandoning plans to reverse any single phase motor, if the dataplate doesn't indicate "Reversing",
It's probably repulsion inducton based on the absence of a start capacitor that I can
see. There's probaby a brush shifter inside the non-shaft end that permits reversing,
you MUST stop the motor and unpower it to do that.
It will look something like this:
The two hash markes shown line up to a lever sort it item to get fwd and rev, and
the trick to realize this is how a motor like this operates, is the cover opens up
simply by slacking one screw and flipping it out of the way.
While your drum switch diagram shows a configuration for repulsion induction, some
of these motors with four wires are dual voltage, rather than reversible. In my
case the motor shown has the four wires connected as two pairs for low voltage,
and for high voltage it would two tied together and insulated, the other two being
the incoming line then.
If you tried to wire my motor up according to the drum switch diagram, I suspect
it would behave as yours does - runs in one direction, will pop a breaker in the
other.
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