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Reversing switch for 220 volt motor

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Tom

04-12-2001 18:20:57




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I am getting ready to install a drum reverseing switch on my lathe motor but realize in all the books I have on tools around here I can't find one that tells me how to wire the switch. Does anyone know?? The motor instructions say to reverse leads T5 and T8 but I don't see how to wire the switch. Any help would be welcome.

Tom




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Franz

04-13-2001 18:08:57




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 Re: Reversing switch for 220 volt motor in reply to Tom, 04-12-2001 18:20:57  
This would be real simple to explain, with a drawing. The drum switch is actually a combination of 2 switches, one is a single pole on/off switch that operates one side of the line feeding the motor. The rest of the switch is a double pole reversing switch.
A close look at the switch innards will usually tell you where the single pole part is. This can be confirmed with a continuity tester, on in both forward and reverse. For sake of explanation, call these screws #1 &2. Call the remaining screws #3 4 5 &6 for sake of a better identifier.
The remaining 4 screws are the X configuration switch that actually does the reversing. Hook 1 wire from #3 screw to wire #5. Screw #4, on the opposite side of the drum base connects to the point you removed wire #5 from. Connect screw #5 to wire #8, and screw #6 to the place you removed wire #8 from. JUST REMEMBER, TO LET THE MOTOR COME TO A COMPLETS STOP BEFORE SWITCHING TO REVERSE FROM FOREWARD. A SINGLE PHASE MOTOR WILL CONTINUE TO RUN IN THE DIRECTION IT'S GOING IF REVERSED WHILE IT IS STILL TURNING.

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Tom

04-13-2001 19:08:01




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 Re: Re: Reversing switch for 220 volt motor in reply to Franz, 04-13-2001 18:08:57  
Thanks, I think I can get it with your explanation. And thanks to all you other guys who answered back with ideas! I am beginning to understand how it works with all the ideas and discussion, plus checking out the switch, it is as Franz says one pair is connected in either switch position, and the other four make connections either across the switch or to the remaining screw on the switch on the same side.

Tom

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Ford Man

04-12-2001 21:09:29




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 Re: Reversing switch for 220 volt motor in reply to Tom, 04-12-2001 18:20:57  
Tom,
I took my motor and switch to the local electric motor repair shop . They wired it for $10 .

Different brand drum switches are sometimes different in the switching . I took a tester to the switch that the shop wired for me and figured out how they did it . I have been able to wire a couple more myself since .

Post a schematic of the motor wiring ( especially which wires must be connected to change direction ) and the drum switch diagram and I will see if I can help .

A couple of things to remember , not all motors are reversable ( check the plate ) , and you will not have instant reverse if not running 3 phase power .

Ford Man

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RON/PA

04-12-2001 19:20:51




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 Re: Reversing switch for 220 volt motor in reply to Tom, 04-12-2001 18:20:57  
TOM, YOU CAN ACHIEVE THIS WITH A DRUM, OR BARREL SWITCH. YOUR CENTER POSITION WOULD BE OFF, ONE WAY WOULD CAUSE THE MOTOR TO ROTATE CLOCKWISE AND THE THIRD POSITION WOULD BE FOR CLOCKWISE, FROM THE CENTER YOUR CAN TURN THE SWITCH TO RUN YOUR MOTOR EITHER WAY.



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Al English

04-12-2001 19:02:29




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 Re: Reversing switch for 220 volt motor in reply to Tom, 04-12-2001 18:20:57  
Hi Tom, You'll need a double pole/double throw (DPDT) switch to do what you want to do. This is actually two single pole/double throw (SPDT) switches in a common case with a common lever...Al English



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Tom

04-12-2001 20:20:24




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 Re: Re: Reversing switch for 220 volt motor in reply to Al English, 04-12-2001 19:02:29  
Yes, I have a drum switch with 3 terminals on each side, but I don't have a diagram of how to connect it all up.



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Skinner

04-13-2001 06:16:39




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 Re: Re: Re: Reversing switch for 220 volt motor in reply to Tom, 04-12-2001 20:20:24  
It would require a 3 position (center off) double pole, double throw switch. Your wiring will depend on the switch layout, but if you have three terminals on each side then normally, the terminals in the center are input, and the top terminals is 1 output, then the bottom terminals is the other output (depending on the switch position). With that said....

Normally you would do this by hooking the line 1 to the center terminal on one side then line 2 to the center on the opposite side. (line is the power coming in. line 1 would be 1 leg of 220 and line 2 would be the other leg).

I don't remember which terminals you stated above for reverse, but you would hook the two terminals for clockwise rotation to the top side of the switch (1 to each side) then for counter clockwise you would take the recommended terminals and hook to the bottom terminals.

So for example only, if T1 and T5 were for CW and T2 and T4 were CCW, then T1 hooks to the top left terminal, T5 hooks to the top right terminal, T2 hooks to the bottom left terminal, and T4 bottom right terminal.

If your switch is different, then either look at the print, or take your ohm meter and check continuity across the terminals to find out the pattern.

Either this helped you or confused the heck out of you.

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Al English

04-13-2001 16:43:30




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 Re: Re: Re: Re: Reversing switch for 220 volt motor in reply to Skinner, 04-13-2001 06:16:39  
Hey Skinner, Kind of like writing someone a letter to teach someone how to tie their shoes isn't it?...Al English



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Franz

04-14-2001 21:54:10




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 Re: Re: Re: Re: Re: Reversing switch for 220 volt motor in reply to Al English, 04-13-2001 16:43:30  
Al, my favorite demonstration is where you take 1 instructor, a jar of peanutbutter, a jar of jelly, 2 knives and a loaf of bread, along with a room full of college kids. Each kid in turn gives 1 instruction, and the instructor does it. The idea is to make a sandwinch, and the usual result is to make a mess.
Years back, Xerox did a study to find out how many pages it took to instruct a person how to smoke a cigarette. After a few months of study, they concluded it would take over 500 pages, 8 1/2 X 11, single space.
Tain't necessarily easy to write instructions, even when you know what you want done. Lot easier when you can see what's happening and yell stop.

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