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  1. tosh999
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    tosh999 New EF Member

    I have got a 3 phase motor running a conveyor belt, every couple of days it will trip the overload. I have tested the motor, windings are ok, not drawing excessive current, good insulation resistance. It has a brake mounted on it but this seems to be releasing ok.
    Motor does get a bit hotter than the 2 conveyor motors next to it.
    any ideas
     
  2. Pete999
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    Pete999 Trusted Advisor

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    Location:
    Northampton
    What is the flc of the motor?
    What are the overloads set at?
    How it it wired DOL or SD
    How is the motor configured Star or Delta?
     
  3. westward10
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    westward10 In echoed steps I walk across an empty dream. Electrician's Arms

    Location:
    Northamptonshire
    If it is running hotter than the other two and the motors are under similar loadings could be a bearing problem.
     
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  4. Barry White
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    Barry White Guest

    Intermittent problems are the hardest to find. could be as said above.
    Do the basic things first
    Check the belt runs freely no stiff bearings or badly tracked belts.
    Clean the fan, cowl, and motor casing so it can cool correctly.
    Check condition of any remote isolator and the actual contactor loose, dirty or pitted contacts can cause intermittent phasing and overload. Also check and test cable condition.
    Use a clamp meter to check the current draw each phase.
    Do you know if its tripping on start up or after its been running for a while?
     
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  5. ams3521
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    ams3521 New EF Member

    Location:
    Manchester
    Exactly what came to my mind if all the motors are of the same spec.
     
  6. Marvo
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    Marvo GMES....You absolute beauty. YOU ROCK DUDE!!!! Staff Member

    Location:
    South Africa
    More info required. As per Pete's questions, how's it wired, YD, DOL or is there a drive?
     
  7. Corona
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    Corona New EF Member

    Location:
    Norfolk
    What material are you conveying? If the environment is dusty or damp, or the faulting conveyor is used more than the others, you may have to up the PPM on that asset. Overloads generally set at 5/8 FLC or 65% ish, if its already been cranked up there may be much knee work and head scratching.
     
  8. koldwater
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    koldwater EF Member

    Location:
    STL
    Business Name:
    Koldwater Technical Training Software
    If the current, load, load frequency, and environmental are same as other two motors. You confirmed all wiring. you could be seeing the results of a past problem. Like a previous load issue over heated motor and caused insulation failure, or contractors worn from past problem. Basically I am reminding you to consider, past abuse may have have caused degradation which now presents itself to appear as intermittent problem when it is really an accumulative issue. Ringing it and use a scope may help verify.
     
  9. netblindpaul
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    netblindpaul Trusted Advisor

    Location:
    South Wales
    Not quite sure how the motor can answer a phone for you to ring it!
     
  10. Rob
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    Rob Trusted Advisor

    Location:
    North west
    Only if the motor is YD and the overload is in the delta leg.
     
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  11. koldwater
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    koldwater EF Member

    Location:
    STL
    Business Name:
    Koldwater Technical Training Software
  12. netblindpaul
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    netblindpaul Trusted Advisor

    Location:
    South Wales
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  13. Pete999
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    Pete999 Trusted Advisor

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    Northampton
    Stupid Septics Meg a motor, what next?
     
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  14. LeeH
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    LeeH Insert witty monkey comment here. Electrician's Arms

    Location:
    Lincs
    I had to change the rotation of 2 motors on a US machine yesterday.

    Some of you will like the termination.

    The whole machine was a mess, panel and everything.

    View attachment 35872
     
    • Like Like x 1
  15. Rob
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    Rob Trusted Advisor

    Location:
    North west
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  16. mickfred
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    mickfred Regular EF Member

    Location:
    Liverpool
    Are all the conveyor s the same ,if not the heat can be a red fishy , most likely bearing or damaged fan (if not swap overloads over)
     
  17. koldwater
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    koldwater EF Member

    Location:
    STL
    Business Name:
    Koldwater Technical Training Software
    Cheers. o_O My stupidity could be all my own, nothing to do with what country I am from. Enjoy your retirement.
     
  18. darkwood
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    darkwood It's all about Gmes Staff Member Electrician's Arms

    Location:
    West Yorkshire
    Can we all get back on topic instead of bouncing and rising up off each other, it will only drag the thread off topic and lower the tone, a little appreciation to differing terminologies would help too.
     
  19. darkwood
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    darkwood It's all about Gmes Staff Member Electrician's Arms

    Location:
    West Yorkshire
    Pete, please can we avoid such comments please, calling members stupid for the different international workplace slang is not going to help, it is often taken offensively hence the response you got, can we be a bit more respectful to our new American member.
     
  20. Pete999
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    Pete999 Trusted Advisor

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    Northampton
    Yes OK sorry guys
     
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  21. Pete999
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    Pete999 Trusted Advisor

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    So sorry mate,
     
  22. mickfred
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    mickfred Regular EF Member

    Location:
    Liverpool
    6.50 am ,Pete get to bed
     
  23. Pete999
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    Pete999 Trusted Advisor

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    Northampton
    Been up 1/2 an hour.
     
  24. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    beat ya. was up @ 5. chihuahua about ready to give birth, had to check her.
     
  25. Pete999
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    Pete999 Trusted Advisor

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    Northampton
    :dog:
    Oh good luck to the pooch hope all is well with your extended family, quick question Tel what batteries do you use for your laser level:rolleyes:
     
  26. netblindpaul
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    netblindpaul Trusted Advisor

    Location:
    South Wales
    darkwood,
    With respect, if he is going to come here and proport to be able to teach, train & advise, then he should use "our" terminology, this is a UK forum, and if you went on a US forum and started talking about doing things correctly instead of the wire fire and leave mentality they have, and the use of wire nuts, and other such stupid devices that are beginning to impinge on our more robust methods of connection, and further more, because of the issues that occur in the NEC world, we may be forced to utilise one of, the, most ridiculous devices known to the electrical world, you would be flamed off the planet.
     
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  27. darkwood
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    darkwood It's all about Gmes Staff Member Electrician's Arms

    Location:
    West Yorkshire
    With all respect net, there are many ways to make a point but when it comes down to mockery and insults then it pulls the thread down and takes it off topic, yes! there may be very different terminologies and standards and that would be a thread in it's own right but this thread was been taken off the topic point and although mild, insults were been given, they bait for a war of words.
    There are many ways to skin the preverbial cat to get the same point across, I only stepped in because it was getting off topic and becoming personel.
     
    • Like Like x 2
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