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Author Topic: Mystery reverse polarity  (Read 4015 times)

Tricky Dicky

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Mystery reverse polarity
« on: November 06, 2014, 06:27:33 pm »

Hi All,
 Went to give my Caldercraft Brannaren its first sailing in my ownership. I'm using a Planet 5 TX with a Planet 6 RX all working fine. it was necessary to reverse the rudder operation by changing the switching under the panel. All went fine with a good hour or so enjoyable sailing. I brought her into the jetty in preparation to lift out. This may be my error, I turned off the TX and put it down out of the way, the motor on the boat suddenly sprung into life running astern, I grabbed the TX switched it back on and tried to control the motor to no apparent avail. Immediately I switch off the power in the boat and lifted out. When I had collected myself I re-tried the set up all seemed returned to normal except now I realize that the motor control is reversed eg., down on the TX stick for forward and up for astern. No wiring was changed or any alteration made at all except turning the TX off with the power on the boat still on. Any ideas? I have checked the RX connections, 1 ESC 2 Rudder. {:-{
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john44

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Re: Mystery reverse polarity
« Reply #1 on: November 06, 2014, 07:11:18 pm »

Hi Tricky, by turning off your Tx first  the loss of signal to the Rx sends the boat into fail safe
Mode, which on some older planet 6 Rx,s is full on!
Check rotation next time out and either swap motor leads over or Chanel switch on Tx.
The fail safe on the newer Recievers have a zero any stick position.
Transmitter on first off last.


John
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tr7v8

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Re: Mystery reverse polarity
« Reply #2 on: November 06, 2014, 07:27:27 pm »

Yup either kicked in failsafe on the RX or the ESC has got screwed up. TX on then RX, RX off then TX.
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Tricky Dicky

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Re: Mystery reverse polarity
« Reply #3 on: November 06, 2014, 08:59:26 pm »

Cheers everyone, I had a sneaking suspicion something like that had happened, being new to the pastime and having read my accounts on the forum regarding setups the failsafe has been mentioned several times. I am thinking of fitting a brass prop I imagine if I reverse the hand of the new prop all will be ok.

John44 did I meet you on Wednesday I came down to Westport as you were all packing up though 2 of you did come back after a cuppa to see I was alright and was able to correct the rudder function on the spot. I'm trying to join the club and if that is the level of support members give that's very encouraging, thank you. :-))
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john44

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Re: Mystery reverse polarity
« Reply #4 on: November 06, 2014, 11:56:09 pm »

Yes we did meet, It was myself and George that came back to make sure you were o/k
You are very welcome, any help you need just ask.


John
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Tricky Dicky

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Re: Mystery reverse polarity
« Reply #5 on: November 11, 2014, 05:39:01 pm »

  Just an up date having excepted the cause of my problem and that the motor was now running reverse to the TX I have concentrated on repairing damage present when I bought the boats. I reached a point where I needed to float test Sir Kay and was alarmed to find that its motor now ran in reverse to the TX. Abit of trial and error now took place including re binning the RX to no avail. I then remembered the adjustments on the Planet 5 under the little window in the bottom left hand side of the TX. We had already changed the the switch position to correct the rudder function and I noticed one reading THR so I changed its position and despite not appearing to have made any difference before it certainly did this time and correct control was returned to the motor. The test now was would this correct the Brannaren and sure enough it has. Question now is what was the default position when I originally bought the TX. Anyway lets leave sleeping dogs lie so to speak :-)) :-))
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inertia

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Re: Mystery reverse polarity
« Reply #6 on: November 11, 2014, 07:09:43 pm »

From memory of the T5 set you have to switch the transmitter off, then move the servo reverse switch, then switch the Tx back on again for the reverse to take effect. Don't forget that you can reverse the rotation of a DC motor simply by swapping over the two wires from the speed controller to the motor terminals. If it was rocket-science then I'd be knitting socks for soldiers instead.
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malcolmfrary

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Re: Mystery reverse polarity
« Reply #7 on: November 11, 2014, 08:54:29 pm »

With almost any combination, it is best to have the TX N-R switched to N, and wire the motor to run the right way.  Some ESCs give more power in forward than reverse, some have a relay for reverse.  You usually want the best power for forward, and the relay, when operated, takes considerable current from your RX supply.  Futaba like to be different, and mostly, are best set up with the switch set to N.  I recently came across a cheap Chinese ESC with an asymmetrical output that was designed by a Futaba fan - that needed to be set up with the switch set to R on my transmitter. 
Its amazing how many variations you can get that are total opposites within a simple standard.
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john44

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Re: Mystery reverse polarity
« Reply #8 on: November 11, 2014, 09:42:11 pm »

Hi,tricky, the default lies in the Rx. You have already stated in your original post, when you
Turned off the Tx your boat went into full reverse, so I would say your Rx is the one with
Full on as the fail safe. If you want to double check with the boat out of the water on its stand
Switch on as normal, Tx on then switch the boat/Rx on wait for binding to finish, try the
Controls all should be normal. Then turn off the Tx, if the motor goes full on switch the Rx off.
That will prove what the failsafe /loss of signal position is.


PS we will be down the lake tomorrow from 9 am


John
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Tricky Dicky

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Re: Mystery reverse polarity
« Reply #9 on: November 11, 2014, 10:26:11 pm »

 Thanks Guys, great feedback, the point I was making though was that both the boats were now in "reverse mode" despite only one one of them being at the water the other still at home. However, all is now well so lessons have certainly been learned and many more will be thanks to the wealth of knowledge contained within the forum.  :-))

John 44 will not be sailing tomorrow as both boats are under going repair but weather permitting may pop down anyway. O0
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