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HelicopterRadio - Servo - Gyro - Gov - Batt › Is my Spartan 760 toast?
10-08-2010 03:44 AM  7 years agoPost 1
Andypants

rrApprentice

Sydney

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Hey guys

Took a month's break from flying and bought myself an inolab 201 and Spartan 760 for my rex 250 in the meantime, ready to tear up the skies in style.

But there's a problem. I got both second-hand from a trusted source and he said he'd set it up for a 250 (he doesn't fly anything else). So I haven't touched any perameters at all thus far. However, as soon as I plug in the battery, the tail servo goes crazy - 'chattering' from side to side and the rudder sticks move the chatter sometimes, sometimes not. I've tried it on 0% gain up to 100% gain with the same results. It'll chatter like this for as long as it's plugged in. The blue light initially displayed four flashes then a pause, and now doesn't light at all, which doesn't bode well.

The weirdest thing is both the ESC and the tail servo were COOKING hot after a few minutes' being plugged in. Way beyind normal operating temperatures, especially seeing as it wasn't flying - only powered on the bench.

So I plugged the inolab directly into the Rx and it works fine. Hmm, okay. So then I plug an aileron servo (Hitec 65MG) into the gyro and same chattering malfunction there. So the problem is clearly the Spartan... but I've no idea what the problem could be.

Any ideas, anyone? My only ideas are there's perhaps a short in the gyro's wiring (although I can't back that up with anything approaching actual knowledge or proof), or my battery is feeding in incorrect voltage. The fact it's clearly stressing the tail servo in particular leads me to believe it's a fault rather than some hidden diagnostic mode or something. Never used Spartan products before so I'd rather get some advice before I leap in and ruin everything.

Cheers guys

Andy

Lots/Very high/Ridiculously hard/No you can't

I HEART BLADE FARTS

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10-08-2010 05:25 AM  7 years agoPost 2
ch-47c

rrElite Veteran

san jose, ca

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Andy,

Go to spartan-rc.com and download their installation guide.

What voltage is the battery? The ds760 is rated 4.0 volts min to 8.4 volts max. Do you need to regulate your voltage for the servo?
I don't know what servo you had or what servo specs your source setup the ds760 gyro to operate at. The ds760 shouldn't be used with analog servos. The Hitec 65MG is an analog type servo, which can be damaged or rendered unreliable.

I'm thinking the servo isn't matched to the gyro. If you don't have a servo listed in the guide, email Spartan for info or match your servo specs with one listed, then setup and configure.

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10-08-2010 10:48 AM  7 years agoPost 3
Andypants

rrApprentice

Sydney

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Hey mate

The Inolab is definitely there on the list on the Spartan website so it works with the Spartan - the 201/760 combo is very popular for the finicky rex 250... pretty much the gold standard without robbing a bank first. I hope I didn't cook the Hitec - it was plugged in for three seconds tops but you never know.

because the combo is so popular and many people match it to the Hitecs on the cyclic, I hadn't considered a possible need for a stepdown as I'd never heard of the need for it. But it gives me another avenue for enquiry and would definitely lead to the servo acting spazz and overheating.

A user on another forum suggested the frame rate/pulse width has been set incorrectly which also sounds reasonable.

So we've got possible need for a voltage stepdown and possible incorrect pulse width/frame rate. I'm heartened nobody seems to think it's trashed as yet.

I'll keep you updated.

Andy

Lots/Very high/Ridiculously hard/No you can't

I HEART BLADE FARTS

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10-09-2010 12:13 AM  7 years agoPost 4
gorn

rrElite Veteran

Western Australia

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If you cant find the issue...

go to Spartans Website, fill out a service form.
They are very pro-active.

For the love of the hobby

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10-09-2010 12:40 AM  7 years agoPost 5
raptorheli2

rrElite Veteran

rip off britain and​no changing it

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sounds like you haven't set up the gyro properly. i think you need to change the frame rate to suit your servo and your golden.

cheers


www.waterfoothelis.com

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10-09-2010 06:26 AM  7 years agoPost 6
Andypants

rrApprentice

Sydney

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Yerp - getting into the menu was a bit harder than I thought but once I did, I adjusted the frame rate and all is cruisy.

I swear, the internet has given helis a new lease of life. Can you imagine troubleshooting something like this by yourself, with no net and with no flying field or club nearby? What about V-Bar systems? Complex avionics like this are pretty dependent on the end user being able to troubleshoot.

yay internet! And runryder. Fanks guys!

Lots/Very high/Ridiculously hard/No you can't

I HEART BLADE FARTS

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