robbins myers motor wiring

[wentzele]

I have a Robbins Myers motor 1842405031 KLM330b0ll

It is 1/4 hp 110v ac with 3 wires Blue Yellow Red and requires a capacitor
460-525 mfd.

No wiring chart and I can't figure out to hook it up.

Tried Yellow to line
Red to Cap
Blue to other side Cap also connects to neutral

Lots of vibration and spins but gets hot and smoke very soon.

Need help, can't find anything about this motor even at Robbins Myers,
most be a end user part number and they don't give info on thoses.

Thanks in advance for help



-------------------------------------




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[Samuel M. Goldwasser]

I have a Robbins Myers motor 1842405031 KLM330b0ll

It is 1/4 hp 110v ac with 3 wires Blue Yellow Red and requires a capacitor
460-525 mfd.

No wiring chart and I can't figure out to hook it up.

Tried Yellow to line
Red to Cap
Blue to other side Cap also connects to neutral

Lots of vibration and spins but gets hot and smoke very soon.

Need help, can't find anything about this motor even at Robbins Myers,
most be a end user part number and they don't give info on thoses.

First, figure out which of the 3 wires is the centertap. That's Neutral.

Next, given the uF value of the cap, it sounds like a starting cap, NOT
a run cap, so there has to be a centrifugal starting switch. Figure out
which wire goes to the centrifugal switch. The cap goes from Hot to that
wire. The remaining wire is Hot.

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[wentzele]

wentzele had written this in response to
http://www.electrondepot.com/repair/Re-robbins-myers-motor-wiring-25712-.htm
:

Samuel M. Goldwasser wrote:





-------------------------------------

Thanks for the input. This is an open frame type motor, meaning I can look
inside both ends and there isn't a centrifugal switch in there. There is a
thermal overload reset but thats it.

Right now I have the Blue and Red to lines and the Red and Yellow to the
cap.

Appears to run, not extremely smooth. It is a new motor and really looks
well made. I want to use it on a homemade cnc spindle. It is 3750 RPM, I
didn't mention that before not the it matters for the wiring.

Thanks for your help



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[Alan Douglas]

Appears to run, not extremely smooth. It is a new motor and really looks

well made. I want to use it on a homemade cnc spindle. It is 3750 RPM, I
didn't mention that before not the it matters for the wiring.

Must be 3450, as 3750 would be above synchronous speed.

"110 Volts" implies a very old motor, which was a bit puzzling.

If there's no centrifugal switch there must have been an external
relay to disconnect the start winding and capacitor.

Find out which is the run winding by measuring resistance and picking
the lower of the two. That one goes across the AC line. The start
winding goes across the line, in series with the capacitor, for a
fraction of a second.

Alan

 

[wentzele]

wentzele had written this in response to
http://www.electrondepot.com/repair/Re-robbins-myers-motor-wiring-25731-.htm
:

Wild_Bill wrote:





-------------------------------------


Hey, Thanks for all the great info, its helps greatly.

I may have to put a start relay in if needed. I am an electronic
technician and understand lots of stuff but sometimes these motors
really get confusing since there doesn't appear to be a standard and
also part numbers clearly marked on it and yet with the internet no
documentation to go with it.

I do have to state, yes it is 120v clearly stamp on the plate and RPM 3520
But being an old timer from vacuum tube days I am surprised I did not say
117v ac instead of 110v.

I tried to post pictures of the name plate on the motor but I can't seem
to find a method to do that here. I hope to try a timer relay to open cap
after start or simply pull the wire after it starts. I know, I will be
careful for all those who are about to tell me that is dangerous.

The nameplate also clearly states 450-522mfd 165v ac.

Earl



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[wentzele]

wentzele had written this in response to
http://www.electrondepot.com/repair/Re-robbins-myers-motor-wiring-25731-.htm
:

Wild_Bill wrote:





-------------------------------------

Well, I have it running, now I need to find a starter relay for the cap.

Hooked it up with the yel wire to the cap, this wire came out of a Klixon
temp
reset. The other two winding also go to different terminals on the reset
but then head straight for the windings and come out from the bottom of
the motor.

If I hook one line to the other side of the cap along with the red or blue
line of course the line not connected to the cap goes to nuetral. The
motor starts right away but hums or vibrates and gets warm. I then pull
the yellow line off the cap removing cap from circuit and motor run very
smooth and cool. Switching red and blue line changes motor direction of
course.

So everything is working fine, just need to find an external cap start
relay.

Thanks much guys, I am on my way.

Earl



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[wentzele]

wentzele had written this in response to
http://www.electrondepot.com/repair/Re-robbins-myers-motor-wiring-25746-.htm
:

Meat Plow wrote:





-------------------------------------


Yes it does but it is a discontinued module and I can't find the data for
it.
I put it back together I think the number on it was DK 12-35

If you have some info on this I sure would like to figure that out.

There is only one wire the comes out of the motor which to a yellow wire
and has T1 label on it. I connected to cap as stated earlier but it does
not disengage the capacitor after the motor starts.



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[wentzele]

wentzele had written this in response to
http://www.electrondepot.com/repair/Re-robbins-myers-motor-wiring-25806-.htm
:

Michael A. Terrell wrote:





-------------------------------------


It does have a klixom KD12-35 and it has 3 terminal on it.

Two terminals connect to wires which head into the coils.

The third is a yellow wire mark T1 with I connect to one side of

the Cap. The other side of cap goes to either red or blue wire depending

on direction of rotation plus to one side of line.

It still does not disengage cap after start but if I remove the yellow
wire from the cap after it starts it runs real smooth.

So either the Klixon is not working or it is not a dual purpose device.
That model is obsolete and not available so I need an alternitive external
relay to control it.

Any ideas?

Thanks


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[wentzele]

wentzele had written this in response to
http://www.electrondepot.com/repair/Re-robbins-myers-motor-wiring-25806-.htm
:

Michael A. Terrell wrote:





-------------------------------------

OK, thanks again for the info.

Yes I did go to klixon website and they show a picture of the unit but say
it is obsolete and no data given.

I think I have decided to just build a simple 555 timer and drive a
mechanical or solid state relay. The is the spindle motor for a small home
built CNC machine I am building for my son and it was suppose to be done
by Cristmas so I think I have spent too much time on this starter.

Thanks all for your help, at least I got the motor running and once I
disconnect the cap it really runs very smooth. Will drive the machine very
nicely. The computer will control the start logic, I will set for about
500 msec as a starting point.

Earl


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[Franc Zabkar]

Yes I did go to klixon website and they show a picture of the unit but say
it is obsolete and no data given.

Try the Wayback Machine:
http://web.archive.org/web/*/http://www.klixon.com

- Franc Zabkar