T-34 - A & B motors

matelot · Extreme 3D Joined: 09 Jan 2012 Posts: 106 Location: France

Hi, peeps,

Both motors have packed in - A motor gave off smoke after starting to spin up with a new battery, and B just remained cold after causing a plummet. Although there's continuity with a multi-tester, there's no rotation.

If I disconnect them from the receiver for further testing - in case that's the error - does each motor take the full 7.4V, or does the receiver split the voltage to 3.7V each? Don't want to mess up anything else by pumping in too many V.

Cheers
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tombo242 · Posted: Sat Jan 28, 2012 10:00 pm Post subject:

Hi Matelot,

Your ESCs vary the power to the motors according to throttle and rudder settings. I doubt that the ever get the full 7.4V as a straight battery connection. I think that I would test at perhaps 3V to see if anything works, but first I would check what power is coming out of the ESCs. The most likely thing to burn out is the 3(or whatever)-in-one control unit powering the motors. (I think that part is what you called the receiver.)

Tom.
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matelot · Extreme 3D Joined: 09 Jan 2012 Posts: 106 Location: France

Well, that's a bummer. Clicked off the receiver cover, only to snap off the on/off switch as well! Cack.

New blades and new batteries on standby, and now I may as well get two new motors and a receiver... I'll try and jury-rig 3V into each motor, but without an on/off switch, I think the rx is for the bin. Crying or Very sad

Edit:

Managed to move the remnants of the receiver switch. On or off, neither motor will spin if connected to the receiver and powered through the receiver (and tx) or powered independently. When totally disconnected, the A motor will spin fine according to voltage applied.

So although the receiver red light comes on and flashes, I've got a serviceable A motor, and a u/s B motor and receiver.

Does that sound about right before I order any bits? What if it's the transmitter and B motor? How would I check the tx against the receiver?

Cheers
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tombo242 · Posted: Sun Jan 29, 2012 3:53 am Post subject:

What I would do is plug the B motor into the A motors' power. It will probably go the wrong way, doesn't matter - if it spins it's fine and it's the Rx/controller - if no spinning then you know it's a U/S B motor.

Tom.
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matelot · Extreme 3D Joined: 09 Jan 2012 Posts: 106 Location: France

Thanks, tombo. I'd tried that earlier. Neither motor will turn if connected to the rx, whether powered through the receiver or left connected and power applied directly to the terminals on top of the motor. If totally disconnected from the rx and each motor tested in turn, the A will spin up, but on no occasion does the B spin up.

But if the A motor will NOT spin up when powered either way yet connected to the rx, how will I know if it's the receiver or transmitter? I'm assuming the rx is faulty as the tx didn't fall out of the sky! Accepting a dud B motor in any event.
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tombo242 · Posted: Sun Jan 29, 2012 7:09 am Post subject:

OK Matelot,

All we can tell for sure is that it is either the Tx, ESCs or Rx. As you say the Tx did not fall out of the sky so it is likely to be alright. You certainly have one U/S motor.

I find that the T-34 has - "Auto power-off system to protect the blades and motors if struck." However, I can't find any information on how to reset it. It could be just this system still trying to protect the motors. (Obviously not a fast enough power-off to protect the 'B' motor.) Other than that it has to be the controller in the heli. Most likely not the Rx section, probably in the motor control section of the controller. Unfortunately the whole thing seems to be built into one unit.

Wish I could help more.

Tom.
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matelot · Extreme 3D Joined: 09 Jan 2012 Posts: 106 Location: France

That's fine, tombo. Thanks for help. I'll grab another B motor and new rx unit from... Jenair8? They look reasonble.

It'll be fun taking the machine apart to repair.

Cheers
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tombo242 · Posted: Mon Jan 30, 2012 6:02 am Post subject:

That's the spirit Matelot,

If it's already broke you can't make it worse and you could make it better.

Got to it!

Tom.
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