Mill Reverse Wiring Problems

[ebstauffer]

I have this motor and a gear reducer powering my MM2.0. Not one to leave well enough alone I wanted to wire up a Hubbell 3025 swith as a reversing switch (I have no good reason to do so, I think you could probaby grind rocks in this thing). The wiring on the motor is relatively simple -- to reverse you simply switch polarity on the T5 and T8 wires -- the others stay the same. The switch schematic is at the bottom.

I have it wired up and it sort of works. If I start it with the switch in the middle (off) position the motor makes a "grrrrrrr" ing sound. It's not pleasant. If I start it with the switch in the down position it move CCW. Toggling the switch neither shuts it off nor reverses direction (I bet it has a centrifugal switch to stop this stupidity). If I unplug, toggle switch up and plug it in the travel is reversed.

What have I done wrong?

 

[raouliii]

Post a photo of the wiring diagram for the motor and explain (or post a photo of) how you have wired in the switch.

 

[ebstauffer]

Here's how I have it (hope this makes sense)

and the full extent of the documentation that came with the motor

 

[sdgenxr]

I can't really tell how you have things wired up just by the pictures provided. However, the picture of your motor states that if you need to reverse the direction, interchange Black(T5) and Red(T8) leads. It might help if you can provide a schematic of how you have it wired up to resolve the initial start problem.

 

[raouliii]

Assuming the wires labeled "to pump" are just attached to T1,T3,T8 & T2,T4,T5, that's not going to work.
T5 and T8 must be switched between the groupings of the other wires. In other words, the opposite direction must be wired T1,T3,T5 & T2,T4,T8.

Important Note: Wiring a DPDT switch with the diagram below will successfully reverse the motor, however, an additional switch will likely be needed to control the 110VAC as I'm not sure how the motor will react to having voltage applied across T1,T3 & T2,T4 while switching. I use a 3PDT switch to include both on/off and reversing functions together in a single switch.

I'll assume the switch is labeled well.

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[ebstauffer]

Apologies to all for the crap picture. Tried to save a bit of time. I have it wired thusly:

It does reverse the rotation as long as power is removed altogether when toggling the switch. I believe you're spot on in that either a 3PDT switch is needed or an ancillary switch to cut power between polarity reversing.

Question 1: what do T1,T3 & T2,T4 connect to? I would guess the cap but then what else?
Question 2: What if you simply reversed the polarity of all conductors instead of just T5 and T8?

 

[raouliii]

Obviously my initial assumption was wrong about your existing connectivity. I don't believe it's a good idea to apply voltage to the motor unless all connections are made. In other words, voltage to T5 and T8 should not be removed while voltage to the the other connections continues to be applied. That produces that horrible sound you heard.

Answer 1:

Answer 2:
Since AC doesn't have "polarity", it would function exactly the same.

The reason swapping T5 and T8 relative to the others will reverse direction is because the start cap's/winding's voltage becomes inverted relative to the run windings.


I used a 3PDT on this build:

The gearbox slows the motor to a halt fairly quickly. It is currently for sale, since I built two.



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[sdgenxr]

That's a thing of beauty!

 

[ebstauffer]

I used a 3PDT on this build

I've been looking for a 3PDT "wall" style switch to no avail. Looks like I'll pick up a toggle-style. Where did you source yours?

That produces that horrible sound you heard.

It raised the hair on my neck!!

 

[raouliii]

I bought my, NTE branded, ON-OFF-ON, 3PDT, toggle switches from ebay for about $12 each. Try to get a heavy duty version and steer clear of the cheap chinese mini switches.

BTW, I have a similar diagram for 3PDT use.

 

[ebstauffer]

http://www.newark.com/nte-electronics/54-015/switch-toggle-3pdt-15a-125vac/dp/32M5201

This is the one you use?

 

[Stealthcruiser]

Link will not load,is my experience.

 

[ebstauffer]

BTW, I have a similar diagram for 3PDT use.

Could you share that here?

 

[raouliii]

http://www.newark.com/nte-electronics/54-015/switch-toggle-3pdt-15a-125vac/dp/32M5201

This is the one you use?

Yes. That's it, but you can likely get an equivalent for about half that price on ebay. Look for NTE or Carling switches. 3PDT, ON-OFF-ON

Could you share that here?

Sure