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[drover]

I am trying to get two M500 motors, an Mtroniks Viper Marine 25 ESC and an 8.4volt battery pack working in something ideally approaching harmony.


When connected individually to the ESC the motors turn but following a wiring diagram i found on the Westbourne site for connecting both motors via a connector block to the ESC they do not respond. Any suggestions as to reason for this.


I also note that when starting to move the throttle stick the motors whine but this disappears at higher revs is there a way of rectifying this.


As a secondary issue I am using a Tamco 2 channel 2.4 ghz radio and found that following the instructions for connecting the throttle connection from the ESC to ch2 on the receiver and steering to ch1 doesn't work. After fumbling about I could only get things to work if I connected the ESC to ch1 and the steering to a socket which may or may not be for battery. The receiver has 4 sockets but the instructions that came with the radio only seem to refer to three. At the moment I have only turned the motors over in short bursts, I'm worried problems may occur when running for longer spells.


Apologies for my stupidity but my model making up to now has involved simply putting finished models on a shelf, I am totally clueless in what I consider the black arts! Next year I should be able to join a club but at the moment it is easier to rely on this forum for guidance.

[Kipper]

If your motors are both 6v, you don't have sufficient voltage in your 8.4v pack to run both together (6v x 2 = 12v)

[morley bill 1]

Hi if your motors are wired in parallel they should still be drawing 6 volt  Bill..

[john44]

Hi drover, I run 2, 600 7.2v motors off 1 speed control using a 8.4v battery with no problems.
I would re check your wiring mine is wired exactly like the drawing on Westborne 2 motors off
1 esc dia. Motor A blue to motor B yellow, motor A yellow to motor B blue.
Then connect to the esc. If they run the wrong way change the esc wires over.
Works for me.


John

[malcolmfrary]

If wired as per this link, it will work with the motors running in opposite directions. http://westbourne-model.co.uk/images/help/Twin-single-new.htm
For us to check possible reasons, a picture of your wiring is needed to compare.  The motors in the diagram are wired in parallel, so both get whatever voltage is output by the ESC.

[nivapilot]

"when starting to move the throttle stick the motors whine but this disappears at higher revs"

The whine is caused by the frequency at which the ESC operates..........ESC's operate on a principle called Pulse Width Modulation (PWM). Full power is turned on and off at the controllers specific switching frequency (ie: 1KHZ) of a brief fraction of a second. As the "on time" is increased the model goes faster. This switching frequency is what is heard thru the motor.(thanks to Greenboat on RC Groups)

You would need to change the ESC to one that has a different operating frequency to try and get either better harmony with the motor, or one with such a high pitched whine, you would not hear it.

"The receiver has 4 sockets but the instructions that came with the radio only seem to refer to three"
The receiver is a three channel receiver, and normally, on a mode 2 transmitter (throttle on left stick), channel one = steering, channel two = elevators (aircraft) and channel 3 = throttle....the fourth set of pins are for binding and power to the receiver

You need to find out which channels your receiver are operating on.....attach a servo to channel 1 and try it see which stick moves the servo arm, try the other stick with the servo in channels 2 and 3, then you will know which stick operates which channel...
Your receiver is a three channel receiver and the transmitter only uses two of those channels.....the third is redundant.

[drover]

should change this topic to no longer a problem...  My son called in last night and I asked him to check that I'd wired up as the diagram. He could see no fault, however in desperation I stripped everything down and then set it up again with him checking I that was doing it properly and now it works. This is why I dislike electrics, we just don't get on. Recall reading another post on this site where someone had an electrical problem which just seemed to resolve itself for no apparent reason.


Navapilot   "one with such a high pitched whine, you would not hear it" I wonder do all the dogs in the vicinity of the pond start acting strangely??

Any way thanks for your responses. Now I'm just hoping it stays working!

[malcolmfrary]

one with such a high pitched whine, you would not hear it" I wonder do all the dogs in the vicinity of the pond start acting strangely??

Quite possibly.  I run a yacht using an ESC as a winch control, so a basically silent boat with just the ESC arguing with the winch motor.  Passing dogs do tend to pay a lot of attention.  Whether its the sight of a big bird or the faint motor whine, who knows?