brainache fault, see if you can work this one out

[jez]

here is a fault that took me about an hour (at least 10 minutes of this scratching my head) to cure, just posting for a bit of a laugh to see if anyone else works it out. (82-70 c series MP chassis)

lane 2, table motor will not start, i clean up the switch cards and test windings ETC, put it bacl together and it will not start, i think 'thats odd' and take it apart again (AO smith combi) and everything is fine, i pull the lead out of the table motor and plug it into the sweep motor and it runs perfectly, started and stopped 20 times with no problems, plugged the lead back into the table and it wouldnt start, i got my newly rewound/refurbished combi and install it, it dosent start, i think 'sh1t, my new motor dosent run' and plug the lead back into the sweep motor, works perfectly, so as something to do whilst i mulled said probelm over, i swapped both combi's (table to sweep, sweep to table) now to my astonishment, the table motor would not run but the sweep motor would, so i knew both motors to be good . . . .

10 points awarded for the first person that works out what the fault was!

even with a degree in engineering, some things still catch you out from time to time!

[Monkeyboy]

Re: brainache fault, see if you can work this one out

Let me guess.

Would it have been the machanical switch on the rotor not sitting properly.

???????????

[LaRue]

Re: brainache fault, see if you can work this one out

I,m so fried by my sweep problem that if I tried to figure that out right now I'd end up in the physco ward.

[jez]

Re: brainache fault, see if you can work this one out

no, not the mechanical switch on the rotor (both motors function perfectly) and it was not a bad connection in the motor plug

have to increase the prize to 20 points [img]/content/btubb/images/%%GRAEMLIN_URL%%/smile.gif[/img]

[EX-MECH]

Re: brainache fault, see if you can work this one out

Gripper Protection Switch?
Yea I'm guessing; Ex-Mech

[Kat]

Re: brainache fault, see if you can work this one out

How were you getting power applied to the motor cords? Using the contactor in the MP directly or the TA and SA cam switches?

This will narrow it down.

[jez]

Re: brainache fault, see if you can work this one out

it didnt matter wether i pressed the contactor, used the cams, used the contactor operating buttons on the side of the chassis or cycled the machine normally the table motor wouldnt start

[willey]

Re: brainache fault, see if you can work this one out

JEZ, did you have the table switch turned off at the back of the machine?
willey.

[Kat]

Re: brainache fault, see if you can work this one out

Originally posted by willey:
JEZ, did you have the table switch turned off at the back of the machine?
willey.

<font size="2" face="Verdana, Helvetica, sans-serif">This wouldn't have come into play since he plugged the table cable into the sweep motor and it worked.

[Kat]

Re: brainache fault, see if you can work this one out

Jez:

Does the motor hum at all like it's trying to start or is it just dead?

Does the table move when you crank it by hand?

I'm leaning in the direction of a bind somewhere in the table shaft...

[willey]

Re: brainache fault, see if you can work this one out

The only thing left is the centrifugal mechanism, posibly something missing here?
willey.

[BG]

Re: brainache fault, see if you can work this one out

umm...bad pins/sockets in chassis plugs?

[Kingram]

Re: brainache fault, see if you can work this one out

I'm assuming you use 220V. in the U.K.
Was your brand new winding wired to run on 120V?

[Mark_S]

Re: brainache fault, see if you can work this one out

Come Jez, don't keep us in suspense.

[JimDorsin]

Re: brainache fault, see if you can work this one out

Ok, so you got power to your table plug, because it would run the sweep. Both motors worked on the sweep, so both are good. Sounds to me to be a bind somewhere also. You say AO Smith? Was the rotor AO Smith too?? I had 3 brand new AO rotors snap within there 1st year of service in Vermont(however this you would notice as soon as you took off your motor). Is the whole gear box AO Smith? I am thinking bad gear box myself.