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Active Contributor

Join Date: Jun 2012
Posts: 12

Capacitor Start/Run Wiring

06/16/2012 1:56 PM

I have and old Ajax motor used to run an old planer. To cut to the chase I have a problem rewiring the capacitors. It has a relay for the start capacitors to cycle out and a thermal switch. It has 5 wires (T1,T4, T5, T17, T18). Has anyone got access to an actual picture of a setup like this. What connects to what? The motor stopped working and I found a bad capacitor. From there it is history that I do not know how to put it back together. I have it running but it is producing excessive heat in the motor and I think it is because i have the capacitors wired wrong. It is a single phase 230 v motor.

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Pathfinder Tags: capacitor diagrams Induction wiring
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Guru

Join Date: Mar 2007
Location: at the beach in Florida
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Good Answers: 484
#1

Re: Capacitor Start/Run Wiring

06/16/2012 2:33 PM

Ajax has many different models, could you provide a model # or hp or number of caps??

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Active Contributor

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#2
In reply to #1

Re: Capacitor Start/Run Wiring

06/16/2012 2:41 PM

Ajax 7184TBF87030AAWCCW ; 5 HP; Frame 184T; Ph1; Code H; XTM5-184T; 1750 rpm; 60 cyl; SEr. 006687; 21 Amp; 230V; Class B; Cont.

All off of the plate. There are four capacitors. Two start and two run. I think they were in parallel, that is start with start and run with run. The relay is Essex RBM C27B, and the thermal switch is Klixon Type LEH 33KB F2A.

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#5
In reply to #2

Re: Capacitor Start/Run Wiring

06/16/2012 3:31 PM
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Active Contributor

Join Date: Jun 2012
Posts: 12
#7
In reply to #5

Re: Capacitor Start/Run Wiring

06/16/2012 3:49 PM

Just old.

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Active Contributor

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#3
In reply to #1

Re: Capacitor Start/Run Wiring

06/16/2012 3:02 PM

I think this it the wiring diagram but I do not know what wire is what wire. Can you label what T1,T4, T5, T17, and T18 would be on this? I do not have a centrifugal switch it is electrical.

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#4
In reply to #1

Re: Capacitor Start/Run Wiring

06/16/2012 3:23 PM
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Guru
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Join Date: Jun 2008
Location: Alabama
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#6

Re: Capacitor Start/Run Wiring

06/16/2012 3:42 PM

Google stearns.rexnord.com/pdf/Cat_902/26-27.pdf. Click the first selection.

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Power-User

Join Date: Jun 2009
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#8

Re: Capacitor Start/Run Wiring

06/17/2012 7:28 AM

Very simple. If the problem is still not sold, at first, measure with an ohmmeter the continuity of the 5 contacts to find 2 and 3 (the 2 will be a thermocontact, and the 3 - the motor's windings).

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Active Contributor

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#9
In reply to #8

Re: Capacitor Start/Run Wiring

06/17/2012 4:33 PM

I think I figured out the connections. When I got the motor running it overheated. I had read somewhere the possibilities for overheating and hoping it was not a partially bad winding I first checked to see if the start windings were shutting down. I did this by checking the starting relay. Not having all the tools needed and being a dirt guy (civil engineer) that works with what he has, I took the relay apart and mounted it so I could look at the relay points as the motor was running. The relays points were sparking like auto points but not disconnecting. I then rigded a way to disconnect the points with the motor running. When I disconnected the points (which I think is also shutting down the start windings) the motor power draw dropped (lights in shop were no longer dimmed) and the motor ran very quiet for some time without overheating. Therefore, I took from all of that that the start windings were not shutting down which was producing the overheating. That all said I now must replace an old start relay and an old thermal switch. I pulled the coil out of the relay and checked its resistance. 3500 ohms. I think bad based on what I have read. Do you concure? Can I replace just the coil in this old Essex RBM C27B 128126-1132TB relay? If not what would be a replacement relay for this relay? Also, the thermal switch is bad and I need to replace it. It is a Klixon Type LEH33KB F2A. Is there a substitute replacement that I can get for resonable price?

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Power-User

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#10
In reply to #9

Re: Capacitor Start/Run Wiring

06/18/2012 1:59 PM

I overlooked the relay. It should be the potential type one. When the motor gathers speed, it turns on and disconnects by its NC contact the additional capacitor. It seems this does not happens and the capacitor is left connected.

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