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  • motor fault + repair

    An electrician wired a forward/reverse motor circuit, but the following faults were found
    a/ motor failed to start

    b/ after starting the motor run in only one direction even when stop and start

    1/ three possible cause for above

    2/ why the motor only run in one direction

  • #2
    Re: motor fault + repair

    Originally posted by Ky4eva View Post
    An electrician wired a forward/reverse motor circuit, but the following faults were found
    a/ motor failed to start

    b/ after starting the motor run in only one direction even when stop and start

    1/ three possible cause for above

    2/ why the motor only run in one direction
    I think more information is needed. First off, is this a DC or AC motor? Secondly, IF AC, it is 3 phase or single phase? Third, is the motor one that was made to be reversed?

    Comment


    • #3
      Re: motor fault + repair

      Its a AC powered motor ,and yes its a forward reverse motor and also its 3 phase wiring

      Comment


      • #4
        Re: motor fault + repair

        Sounds like you have a phase sensative motor. You have to have each hot wired in a specific spot ( you have 9 different combinations & only 1 is going to work). This is not like a normal 3-phase 1 direction motor where you can just switch 2 hots to get the direction you want it to go.

        Comment


        • #5
          Re: motor fault + repair

          It is or isn't running?

          Is it wired right?
          Have you confirmed proper phase rotation?
          Are all of the heater tabs in the motor starter there/good?
          Is there a three way valve in the system? Was it set? If none is it only spinning backwards when another pump turns on? If this is the case the shaft may be sheared.

          More info needed.
          Last edited by Gettinit; 07-09-2012, 09:44 AM.
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          • #6
            Re: motor fault + repair

            it appears to be wired wrong, to reverse a thee phase motor you normally reverse any two leads. (I supposed that a winding in the motor could be at fault as well), and if it does not start it may have two leads on the same line, making it act like it is on single phase,

            the first picture is the switching that takes place in side of a drum type switch,


            the second picture is wiring diagrams on a drum switch (showing nearly all types of motors) three phase on bottom line,


            if it via contractors one will just have to study it out and see what is crossed or miss wired,
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            • #7
              Re: motor fault + repair

              Almost forgot to ask....is there a line reactor for it? Is there a dc volt VFD being used for the motor? What is signaling the motor to do what you want it to do?
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              • #8
                Re: motor fault + repair

                Update?
                AllurePlumbing.com
                • leak detection
                • drain cleaning
                • utility locating
                • conductor fault locating
                • and other specialties.

                Greensboro NC, Winston-Salem NC, High Point NC, Thomasville NC, Kernersville NC

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                • #9
                  Re: motor fault + repair

                  This should be easy for the electrician to fix.
                  Licensed Electrician

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                  • #10
                    Re: motor fault + repair

                    Originally posted by John Valdes View Post
                    This should be easy for the electrician to fix.
                    This should be easy for anyone to figure out with a few hand tools and a meter.
                    AllurePlumbing.com
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                    • #11
                      Re: motor fault + repair

                      Did anyone notice--The OP occupation says "electrician" Something doesn't smell right.

                      Comment


                      • #12
                        Re: motor fault + repair

                        Originally posted by Pipestone Kid View Post
                        Did anyone notice--The OP occupation says "electrician" Something doesn't smell right.
                        I figured he was a new helper trying to get his boss off with a few suggestions from others. As little info that he put up without any actual investigation/results on his part, I was also curious.
                        AllurePlumbing.com
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                        • and other specialties.

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                        • #13
                          Re: motor fault + repair

                          People who have no idea what they are talking about (when it comes to electricity) should keep their opinions to themselves.

                          The origional post said "An Electrician wired...." The best solution have the "Electrician" fix it.

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                          • #14
                            Re: motor fault + repair

                            Originally posted by johncameron View Post
                            People who have no idea what they are talking about (when it comes to electricity) should keep their opinions to themselves.

                            The origional post said "An Electrician wired...." The best solution have the "Electrician" fix it.
                            Funny how I go behind electricians quite often. I work on VFD's. I work on variable speed blowers. I work on pumps and it could be a pump issue. If there is something that I brought to the table that is wrong, then by all means pipe up. I am on my phone so I cannot tell if you have brought anything to the table as of yet other than a smart remark. If their is something you can add that may help, we are all ears....I know I am.
                            AllurePlumbing.com
                            • leak detection
                            • drain cleaning
                            • utility locating
                            • conductor fault locating
                            • and other specialties.

                            Greensboro NC, Winston-Salem NC, High Point NC, Thomasville NC, Kernersville NC

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                            • #15
                              Re: motor fault + repair

                              Originally posted by Gettinit View Post
                              Funny how I go behind electricians quite often. I work on VFD's. I work on variable speed blowers. I work on pumps and it could be a pump issue. If there is something that I brought to the table that is wrong, then by all means pipe up. I am on my phone so I cannot tell if you have brought anything to the table as of yet other than a smart remark. If their is something you can add that may help, we are all ears....I know I am.
                              It's better to be thought a fool than to speak and remove all doubt. Abraham Lincoln

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