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Author Topic: Problem with TT Neptune sub.  (Read 7871 times)

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Re: Problem with TT Neptune sub.
« Reply #25 on: August 24, 2009, 03:42:55 PM »

AFAIK you have a receiver, ESC and ballast tank control board. Anyhting else?

The ESC is a fairly bog standard design, I believe with a built in BEC.

From what I've sen of the control board, it looks like a knock-off of Norbert Bruggens design. A micro controller based relay switcher, that simply enables the peristaltic pump to push each way. I believe it has a low voltage failsafe, missing pulse detection, a pressure senser input to cut the pump before the bag bursts (hopefully), and maybe a water detector(?).

If the receiver is a bit duff, it's entirely possible that you would experience the symptoms you are getting. Add to this the fact that you have tried it with a separate TX, and it is still playing up.

The other thing I would check is to ensure you are getting a good 5 volts to the receiver bus from the BEC. Ideally this wants to be done with a load put on it. You could wire a 5 ohm 10 watt resistor across the leads. This will pull 1 amp across the BEC, which it should be able to manage. Measure the voltage, it should maintain the unloaded reading, if it drops significantly, you might want to consider an external BEC. Depending on the make of receiver, some will happily work down well down to about 3 volts or so (i.e. a lot of futaba kit) whilst others will start to flake out if you drop much below 5 volts.

One other final thing to try. Change the crystals in both TX and RX- sometimes they can get damaged, and I have read that they age, although I'm using crystals that are years old without issues.

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Re: Problem with TT Neptune sub.
« Reply #26 on: August 25, 2009, 05:42:52 PM »

Hope you get it sorted, keeping my eye on this thread, just in case.....
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6705russell

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Re: Problem with TT Neptune sub.
« Reply #27 on: October 09, 2009, 02:09:09 PM »

After purchasing Colins Neptune and making some alterations/additions to it including re-soldering some dry joints on the main board and added some ferrite rings to the motor cables, I have added some lighting and carried out several bath tests and also in the lake to a range of 20metres and there were no problems, i shall try a further range test this weekend...

Russ
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colin-stevens

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Re: Problem with TT Neptune sub.
« Reply #28 on: October 11, 2009, 06:56:35 PM »

have you managed to keep it dived yet?
colin
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6705russell

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Re: Problem with TT Neptune sub.
« Reply #29 on: October 11, 2009, 07:02:12 PM »

Hi Colin

I am still tweeking the ballast (adding more) and using some styrafoam to compensate the extra weight, I have had it just under the surface and no problems yet....

It needs quite a lot of extra ballast to compensate for the side tanks which are making it to bouyant and stopping it going deeper.

Russ
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Albion

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Re: Problem with TT Neptune sub.
« Reply #30 on: October 12, 2009, 02:01:43 AM »

What a great modification, looks like a proper sub not a toy. hope you solve your problems
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colin-stevens

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Re: Problem with TT Neptune sub.
« Reply #31 on: October 12, 2009, 08:49:57 PM »

MMMMmmm, suprised. i did get it to stay under for a couple of minutes, was down quite a few feet before the signal was lost and she surfaced. i was ready to start to mess with the ballast but didnt think i would have to.
sugestion, reckon performance could be increased with nicads or whatever it is that has replaced them and had considered putting them in the battery tubes on the sides.
keep me updated please
colin
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6705russell

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Re: Problem with TT Neptune sub.
« Reply #32 on: October 12, 2009, 08:54:12 PM »

When you were submerging how long did you run the pump for Colin? I f you keep the pump going when the bag is full it reverses and pumps back out unless you kill the pump, perhaps you kept it onto long??

Russ
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colin-stevens

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Re: Problem with TT Neptune sub.
« Reply #33 on: October 12, 2009, 09:01:46 PM »

please dont say that was all it was.
certain there was an auto cut off to prevent over filling?
colin
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6705russell

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Re: Problem with TT Neptune sub.
« Reply #34 on: October 12, 2009, 09:07:31 PM »

That is the auto cut-off, it reverses and pumps the other way before it overfills the bag.
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colin-stevens

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Re: Problem with TT Neptune sub.
« Reply #35 on: October 12, 2009, 09:12:26 PM »

naw wernt that, everything cut off. turning tranny of then on sorted it
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Re: Problem with TT Neptune sub.
« Reply #36 on: October 13, 2009, 07:30:54 PM »

Surely the auto cut-off should just prevent your from over-filling e.g. shut the pump down when the pressure switch trips. Then keep the pump off until commanded to surface from the transmitter. Reversing the pump makes no sense to me at all!

colin-stevens

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Re: Problem with TT Neptune sub.
« Reply #37 on: October 13, 2009, 07:49:37 PM »

testing in the bath would not alloe the bag to over fill
it did reverse, just for a second to take the pressure off.
not what was happening in the open water
colin
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