Motor issue in my Skipjack

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  • Pawly
    Lieutenant, Junior Grade
    • Jun 2013
    • 59
    #1

    Motor issue in my Skipjack

    Hello,
    I have installed an SPC 2 in my submarine and set it up according to the instructions. Upon reenergising and bench testing I have an issue with the motor control. As I apply throttle the motor jerks on then returns back to where I have the throttle position. This happens in forward and astern.

    I have a Mtroniks 15A marine TIO esc, radio set is a JR Propo X-378 transmitter and a R770 reciever. The antenna line is run the the connection point on the bulkhead of the SD. I have shortened all the cables for neatness apart from the esc cable. I have a CC 10A BEC, this cable was shortened as well. I use a lipo 3 cell battery.

    Before the installation of the SPC2 I did not have this issue. When the SD electrics are not in the tube it all runs well. It is once electrics are installed that this issue occurs. I have checked all the wiring for any nicks or shorts, I have not found any.

    Any ideas anybody?

    Regards

    Pawly.
    Tags: None
    • He Who Shall Not Be Named
      Moderator

      • Aug 2008
      • 13404
      #2
      It's early, have not had my coffee, so .... what's an SPC 2?

      David
      Who is John Galt?

        Comment

        • Pawly
          Lieutenant, Junior Grade
          • Jun 2013
          • 59
          #3
          An auto leveller form engel.

            Comment

            • He Who Shall Not Be Named
              Moderator

              • Aug 2008
              • 13404
              #4
              Originally posted by Pawly
              An auto leveller form engel.
              Well, take it out of the system and see if the motor still jerks.

              David
              Who is John Galt?

                Comment

                • Subculture
                  Admiral

                  • Feb 2009
                  • 2414
                  #5
                  As you are using an independent BEC, have you isolated the ESC's BEC?

                    Comment

                    • Pawly
                      Lieutenant, Junior Grade
                      • Jun 2013
                      • 59
                      #6
                      I am using an independent bec and have isolated the ESC's bec.
                      HWSNBN I will isolate the auto leveller this arvo when I get home and see if this is the problem. I don't see how it could be as it is not in the motor line. Stranger things have happened though.

                        Comment

                        • trout
                          Admiral

                          • Jul 2011
                          • 3658
                          #7
                          If it is the leveler, it could be introducing noise. A ferrite magnet might help. Well, we will wait to hear from you.
                          If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.

                            Comment

                            • He Who Shall Not Be Named
                              Moderator

                              • Aug 2008
                              • 13404
                              #8
                              Originally posted by Pawly
                              I am using an independent bec and have isolated the ESC's bec.
                              HWSNBN I will isolate the auto leveller this arvo when I get home and see if this is the problem. I don't see how it could be as it is not in the motor line. Stranger things have happened though.
                              It does share the same power bus as the ESC, so could be the source of bad-signal. Let us know what happens when you try things with it out of the loop.

                              David
                              Who is John Galt?

                                Comment

                                • Pawly
                                  Lieutenant, Junior Grade
                                  • Jun 2013
                                  • 59
                                  #9
                                  Removed the auto leveller out of the circuit, the problem is still there. What is more likely, a dud ESC or receiver?

                                  Shortening the cables, was that a good idea? It looks neat and tidy, no good if it doesn't perform correctly.

                                  I have also noticed that it is going from forward to reverse, it is not jerking but stoping and going in the opposite direction.
                                  Last edited by Pawly; 02-27-2017, 05:02 AM.

                                    Comment

                                    • Subculture
                                      Admiral

                                      • Feb 2009
                                      • 2414
                                      #10
                                      My money would be on a duff ESC. Or perhaps the motor has gone bad?

                                      Try swapping the channels over on the RX. If the problem moves to an adjacent channel, then it isn't the receiver.

                                        Comment

                                        • Pawly
                                          Lieutenant, Junior Grade
                                          • Jun 2013
                                          • 59
                                          #11
                                          Well, if I wasn't frustrated before I am now. I have changed the receiver, same issue in the tube and out of the tube. Found a loose red wire on the CC BEC, reterminated a new end and all works as it should outside the tube. Nice work I think to myself. Change back to the original receiver all working well outside the tube. Cable tie up the wires, etc, test again, all is going well.
                                          Put it back in the tube and I am back to square one. When I throttle fwd, jerks fwd at speed then slows down no hunts around, when I throttle aft it jumps from fwd to aft, stutters. At this stage I power down.

                                          So far I have tried
                                          -remove the auto leveller from the circuit, no change
                                          -changing the receiver, no change
                                          -changed which port the throttle was in , no change
                                          -repaired a loose wire, worked out of the tube but not installed in the tube

                                          Cant think of what else to try.

                                          Regards

                                          Pawly.

                                            Comment

                                            • He Who Shall Not Be Named
                                              Moderator

                                              • Aug 2008
                                              • 13404
                                              #12
                                              Is the motor spark suppressed? If so, are the capacitor wires soldered well to the motor terminals?

                                              David
                                              Who is John Galt?

                                                Comment

                                                • type7
                                                  Lieutenant Commander

                                                  • Apr 2009
                                                  • 186
                                                  #13
                                                  Is there a chance of any binding going thru the motor shaft seal or servo seal? Always seems to cause chatter or or problems if there is any binding or extra friction going on.

                                                    Comment

                                                    • Pawly
                                                      Lieutenant, Junior Grade
                                                      • Jun 2013
                                                      • 59
                                                      #14
                                                      The sub driver is the one that came from Caswell before Nautilus took over, I believe the motor has the suppression it from build, internally. There is no caps on the outside of the can. I will check that this arvo. What size caps would have been used??
                                                      Everything seems to be free running.
                                                      Last edited by Pawly; 02-27-2017, 03:51 PM.

                                                        Comment

                                                        • Pawly
                                                          Lieutenant, Junior Grade
                                                          • Jun 2013
                                                          • 59
                                                          #15
                                                          Well joy to the world and to you guys. Thanks Trout. A ferrite ring has solved the issue.

                                                          Thanks to everyones input, I am now more understanding of electronics in a small area.

                                                          Now onto final ballasting.

                                                            Comment

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