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HelicopterMain Discussion › Futaba tail step down PS-01RS5.0
03-09-2015 04:42 PM  3 years agoPost 1
datidun

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N Ireland

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Would anybody be using this tail step down as I ran into trouble while just about to take off and realised I had no Rudder control,absolute no power going to the servo,both the DS655 tail servo and step down have had 14 flights,after switching off and on again I had power to the servo,my battery is Life 6.6v,I have inspected all the wiring plugs etc over and over again and cant find any fault,the manual I have on the Futaba step down mentions that the step down has a protection circuit in case there is an overload,then remove the cause of the overload and wait 1 hour,that does not help if it happens in flight,my question is would the Life 6.6v cause an overload,the manual does not say what voltage would cause this,I am really puzzled,is it the servo or the step down.

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03-09-2015 05:02 PM  3 years agoPost 2
Andy from Sandy

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Bedfordshire, UK

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I think you will find that that servo will work quite happily at LiFe voltage.

I would be inclined to just remove the step down.

If an overlaod occurs it means the servo is drawing a too higher current not so much you a feeding it too higher voltage within reason.

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03-09-2015 05:10 PM  3 years agoPost 3
datidun

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N Ireland

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I would rather keep the voltage a little lower especially on a tail servo,maybe a different step down,most drop it down to 0.8,so that would give me 5.8v going through the DS 655,but I still dont know what caused it which makes me paranoid,or a step down that does not have overload protection.

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03-09-2015 05:16 PM  3 years agoPost 4
tonyd12

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hamlin,PA

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step down
I use that futaba product for a older 611 gyro and its assoated servo. For life batteries, I use any good ^volt rated tail servo. I don't need or want a higher voltage setup.

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03-09-2015 05:24 PM  3 years agoPost 5
datidun

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N Ireland

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Ok,so do you think the step downs protection circuit kicked in,causing no power to the servo.

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03-09-2015 05:33 PM  3 years agoPost 6
Andy from Sandy

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Bedfordshire, UK

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Does it work now or not? If not maybe you have a faulty servo. If it is working maybe it was binded (bound up) somehow and stalled at power on.

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03-09-2015 05:37 PM  3 years agoPost 7
Four Stroker

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Atlanta

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I use this step down on 2 helicopters with good results. BUT they have 9253 and a JR MPH81G servos. Neither of them are high torque. The 1 AMP limit was probably reached and it activated the overload protection circuit - protecting itself at your expense.

Run a HV tail servo directly off of the LiFe 6.6 volts.

None of the BEC/Regulators in this hobby are any good. The best setup is all HV servos and a battery. A good regulator for 20 AMPs peak would be humongous and nobody would buy it !

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03-09-2015 05:45 PM  3 years agoPost 8
Carey Shurley

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Orlando, FL - USA

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PS-01RS5.0
I use it on my older non-HV servos both for T/R and Throttle

never had an issue with it.

Proprietor - Gas Powered Helicopters

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03-09-2015 05:49 PM  3 years agoPost 9
datidun

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N Ireland

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Yes it works,cant find any faults,there is no binding or strain,I have the same set up on another bird with no faults,must be the over load protection then,I suppose one cannot say if it will happen in flight.

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03-09-2015 10:29 PM  3 years agoPost 10
Four Stroker

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Atlanta

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Correction, I of course do not use it on the JR MPH81G WV. It's an old BLS254 (4.8 volt servo).

But to your point. Servos can intermittently short out. This will reset receivers (brownout) and could easily overload the PS-01. Try another servo.

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03-09-2015 10:59 PM  3 years agoPost 11
datidun

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N Ireland

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Is it possible to overload in flight though,thats what worries me.

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03-10-2015 10:17 AM  3 years agoPost 12
Chris.C

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Hong Kong

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I remember I have similar incidence once. Unplugged it and checked everything and couldnot find any problem.

Plugged it in again and touch wood,it works until today.

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03-10-2015 10:24 AM  3 years agoPost 13
Ron's RC Helicopters

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Corpus Christi, TX

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Is it possible that your gyro didn't initialize properly in this one case?

What gyro are you using?

The PS-01RS5.0 can withstand momentary current draw of 5 amps. Sitting on the ground, I can't see a scenario where the servo would draw that much, assuming you have the limits set correctly.

I agree with Andy; this regulator isn't necessary if you use a LiFe battery. It is designed for servos that run at 4.8 volts and, as opposed to the step down type, the Futaba actually drops the voltage to 5.0 volts.

FYI
I have tested the Align Step Down and, without a load, it drops the voltage anywhere from .4 volts to .6 volts but no more. Since Align's 655 servo is rated for, and designed to operate at 6 volts, it is adequate. However, if you use a tail servo rated for 4.8 volts the Futaba regulator is much better and will give longer servo life.

Of course there is always the possibility that the servo is "talking to you". Over the years I've talked with hundreds of guys about their crashes and what caused them. Quite a few, with tail failure, noted that the servo had started twitching or acting weird, usually right before the crash. Then you have to ask yourself; is it the regulator, the servo or the gyro? Replacing all can get expensive in a hurry, but so can a crash.

The bottom line is... it's your decision.

Good luck
Ron

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03-10-2015 11:24 AM  3 years agoPost 14
datidun

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N Ireland

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Thanx for the replies,I wish there was a straight answer as 50% of the guys use a step down on that servo Align ds655 as its rated 6 volts,what I am told anything higher will damage the servo in the long run,higher voltage is not needed and wont make the heli fly any better,however the manual on the PS-01 does state HV specification system that uses life,lipo the step down can be used,but thanx its peace of mind that one can fly without it,Gyro is Skookum 540.

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03-10-2015 03:18 PM  3 years agoPost 15
Flyin for Jesus

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Troy, IL. 62294

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Most people think a car battery is 12V... But a fully charged one is over 12.5V. Then, with the engine running, the alternator has to put out 13.5-14 volts to actually charge the battery.
Point is... Your 6v NiMh pack fully charged is over 6v... The 2s LiFe pack maintains a pretty constant fully charged NiMh pack voltage. There are 50% of your friends running a step down regulator that do not need one.

I do have a 4.8v servo and run this with no issues so far...

http://www.spektrumrc.com/Products/...rodID=SPMVR5203

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03-20-2015 06:51 PM  3 years agoPost 16
datidun

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N Ireland

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Ok now I need serious advice,because I dont know anymore,brand new servo put in DS655 and another brand you Futaba step down put in all the same brand,had 4 flights so far,today when I was checking the Skookum over on the bench suddenly once again the Rudder went dead,absolutely nothing,plugged in the lap top to see if there was an error,all ok,then I plugged the the rudder servo out and back in,it was fine,WHAT IS GOING ON.spoke to Skookum about the fault,they said it must be the servo,so two new servos and two new step downs,should I take the step down off,I have exactly the same set up on another nitro,no problems,can it be an overload going to the step down cutting off all the power to the Rudder servo,but what surely it would not draw that much

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03-22-2015 01:06 PM  3 years agoPost 17
jharkin

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Holliston, MA - USA

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Most people think a car battery is 12V... But a fully charged one is over 12.5V. Then, with the engine running, the alternator has to put out 13.5-14 volts to actually charge the battery.
Point is... Your 6v NiMh pack fully charged is over 6v... The 2s LiFe pack maintains a pretty constant fully charged NiMh pack voltage. There are 50% of your friends running a step down regulator that do not need one.
Exactly... I sometimes feel like I explain this to at least one person a week. Servo voltage ratings are not absolute limits - they are ranges for certain cell types. like so

4.8v = 4 cell NiCD/NiMH. A fully charged 4 cell would be 5.5-6 volts for a short time. mostt of the flight you would be around 5.4

6v = 5 cell NICD/NiMH. A fully charged 5 cell comes off the charger around 7.3 and most of the time you where running around 6.5 under load

HV servos are rated for 2s lipo, so why they might be labelled "7.4" they can handle up to 8.4 of a fully charged 2s.

Moral of the story is I agree, far to many people are using regulators that dont need them. And some servos can even operate far beyond their official ranges without issue. I run GV-1s (4.8 rating) on 6.6 LiFe all the time, and I have some Futaba 4 cell servos that I have gotten away with it as well (in planes on non critical applications - i dont over driving servos like that on a heli).

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

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03-22-2015 01:30 PM  3 years agoPost 18
datidun

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N Ireland

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Thanx that still does not give me an answer if its the step down or not.

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03-22-2015 06:13 PM  3 years agoPost 19
Four Stroker

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Atlanta

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As stated, the PS-01 is the best stepdown since it is an actual regulator. To test it put a 5 ohm resistor across it and turn it on for 30 minutes. That is about 1 Amp as advertised. If the voltage sags, it's the regulator. If not, it is the gyro (or FBL) or servo. Resistor will get very hot. Don't walk away and burn down your house.

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03-22-2015 11:50 PM  3 years agoPost 20
horsefeetky

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frankfort ky usa

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step down
i only have used western robotics step down. it is very lite and smalland always worked fine for me in tail servos. i have one on a 300 cfx with stock e flite servo on tail that cant take over 5v..

just my 2 cents worth. and it could always be a bad solder joint on the board of the ikon at certain vibration level during flight or spool up. bet it doesnt fail at idle if left all day long but will fail only during flight..

fly fly rebuild 2 to 1 ratio is good right

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HelicopterMain Discussion › Futaba tail step down PS-01RS5.0
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