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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Problem using 94758Z servos on eCCPM - NEW FINDINGS!
04-03-2005 02:51 PM  13 years agoPost 41
I3DM

rrProfessor

Israel

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OK guys,

i just got an FM reciever to test, and i am very suprised with the results.
with the EXACT same sytem (didnt change anything but the Rx) everything runs GREAT on 1 regulator ! the regulator does get hot, but it works ! no freezes at all. i could see the voltage drop in the LED meter when i wiggle the collective hard (4 of those digital working together!) but there are no freezes.

this wasnt a specific Rx issue, since i swapped (PCM) Rx's with identical results.

what do you guys think ? it was not BATT F\S since it did the same with it ON or INH.

whats weird now is why actually using 2 regulators did the trick, since this apperantly isnt a regulator issue after all.. this might explain how my friend who has the same setup on his Extreme running a WC2 radio doesnt have this ?

one wierd thing i did notice, is that im getting glitches on the ground with the Rx antenna completely pointed away from the model, and the Tx away too, and the motor isnt running. this is very strange, and might explain why im getting fail safe locks. this was the same with both my stylus Tx's.

trying to check what makes the glitches i started disconnecting wires, and only when i disconnected the 9254 from the extension going to the gyro - the glitches finally stopped, and stopped at once !!

tried a differnet (NEW) 9254 - same ! put in the WRX servo on the extension - all works ! then i tried the 9254 straight into the gyro (NO EXTENSION CORD) and everything works well !! tried a different extension cord - and again, the WRX is fine and tghe 9254 creates a ton of glitches ! with 2 different extension cords (of the same kind) !!


what do you guys think now ?

www.liorzahavi.com

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04-03-2005 05:13 PM  13 years agoPost 42
JKos

rrProfessor

Redondo Beach, CA

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I3DM,
It could very well be the output pulse nature of the ATX PCM rx versus an FM rx. This is exactly a concern I raised with the new 14MZ's rx which has simultaneous output pulses. The regulator gets hit much harder when three servos try to start moving at exactly the same time versus sequentially as with an FM rx.

I believe the ATX's PCM rx has more of a simultaneous output pulse setup.

- John

RR rules!

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04-03-2005 08:16 PM  13 years agoPost 43
tabbytabb

rrElite Veteran

seattle

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Lior, please test with a NIcd. I am curious to see what you come up with

Tabb

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04-03-2005 08:17 PM  13 years agoPost 44
I3DM

rrProfessor

Israel

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i will, soon.

www.liorzahavi.com

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04-04-2005 12:53 AM  13 years agoPost 45
JKos

rrProfessor

Redondo Beach, CA

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> what do you guys think now ?

1) Lose the gyro servo extension wire.
2) Use servos which connect directly to the Li-Ion pack such as the KO PROPO PDS-2123 (but I noticed you're selling them off) or the new Hitec HS-5995TG.

- John

RR rules!

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04-04-2005 05:36 PM  13 years agoPost 46
JKos

rrProfessor

Redondo Beach, CA

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I3DM,
By the way, I was able to confirm that the output pulse structure on the ATX PCM receivers is a bit different than other brand PCM receivers as well as FM receivers.

The ATX receivers send out pulses in pairs. Channels 1 and 5, 2 and 6, 3 and 7, and 4 and 8. As you can see, channels 2 and 6 which are used for the swash have simultaneous pulses, followed shortly by channel 3. This could definitely be why you didn't have the problem with an FM rx but see it with the ATX rx.

Of note is that this very pulse structure is one of the reasons the Stylus and now the RD radios have been known for behaving very well on eCCPM systems.

I think it will be very interesting to see if regulator problems arise with the new Futaba rx which has all three swash pulses occurring at the same time.

- John

RR rules!

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04-04-2005 06:32 PM  13 years agoPost 47
hhart

rrApprentice

San Jose, CA

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I3DM,

If you are using 2 regulators, then that means that regulator is not supply enough current, or regultor respons is not fast enough. PCM maybe uses more power to process signals, inturn, burns more current thus internal power bus on the rx and servos oscillating before settle down to intended regulated voltage.

Putting 2 regulators take care of the peak current demand, not average current. This might be the reason why 2 regulators works. Do you have any chance to try Fromeco regulators? Seems like this reg response much faster than duralite. Just another thing to try.

hhart.

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04-04-2005 07:15 PM  13 years agoPost 48
I3DM

rrProfessor

Israel

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hhart, the above problem with the 9254 happend with 1 regulator, and as soon as i can test the machine with FM and one regulator, im going back to PCM and will also try the Fromeco instead of running 2 regs..

thanks.

www.liorzahavi.com

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Problem using 94758Z servos on eCCPM - NEW FINDINGS!
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