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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › Futaba PS10
02-12-2018 10:42 PM  7 months agoPost 1
JLF92677

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Southern California

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Does anyone know what is the fail safe mode for Futaba PS10 regulator? In other words, if the regulator fails does it continue to conduct and provide unregulated voltage to receiver or does it stop conducting?

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02-16-2018 10:14 AM  7 months agoPost 2
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

No fail mode... If your pack is in trouble, your bec would be in trouble too.

/

Saludos cordiales,

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02-17-2018 02:10 PM  7 months agoPost 3
Dr.Ben

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Richmond, VA, USA

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Knowing the way Futaba is about safety, I will hazard it would go to pass through, but it would depend on the severity of the failure of the unit I suppose. If enough magic smoke comes out, it could ultimately break the circuit.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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02-17-2018 03:53 PM  7 months agoPost 4
wjvail

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Meridian, Mississippi

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Don't know the answer to the question.

Someone needs to hook one up and pull 20 amps out of it 'till something happens. Not it! Somebody else needs to hook one up and pull 20 amps out of it...

"Well, Nothing bad can happen now."

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02-17-2018 05:22 PM  7 months agoPost 5
JLF92677

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Southern California

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Rojoalfa
Rojoalfa
No fail mode... If your pack is in trouble, your bec would be in trouble
you totally missed the question.

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02-17-2018 05:26 PM  7 months agoPost 6
JLF92677

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Dr.Ben, barring severe over current, yes I would hope it would fail on pass through unregulated mode. It would be good if someone (Futaba) can confirm. Thank for your reply.

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02-17-2018 05:32 PM  7 months agoPost 7
JLF92677

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wjvail
wjvail
Someone needs to hook one up and pull 20 amps out of it 'till something happens.
Agreed!!! Perhaps Futaba will volunteer... I would hate burning $69 doing this test for them.

BTW, I enjoyed reading your Aling 700 XN build post. Well done.

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02-17-2018 06:38 PM  7 months agoPost 8
Dr.Ben

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I can get an answer from Japan. PM me in 3 weeks when Nick is back from his road trip.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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02-18-2018 03:34 PM  7 months agoPost 9
wjvail

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Meridian, Mississippi

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JLF92677
Agreed!!! Perhaps Futaba will volunteer... I would hate burning $69 doing this test for them.

BTW, I enjoyed reading your Aling 700 XN build post. Well done.
I guess there are two questions. If I've read the literature correctly the PS10 is rated for 5.2 volts output and 7.0 amp continuous 13.0 peak output.

The questions are:
- If a receiver pack voltage drops below 5.2 volts, how does the regulator respond? I would only be guessing but I would bet it goes into a pass-through mode. I believe that is what Ben was suggesting. I also see that the regulator is rated for 6.0 to 12.6 volts input so it is a valid question to ask, what does it do with <6.0 volts input.
- The other question would be, and the one I joked about earlier, what does it do in an over current condition? Again I'm only guessing but I got money that says it begins to overheat and reduces current and/or voltage to protect itself.

There are other questions such as:
- why is it 2.4ghz only?
- why can't I put it after the receiver to protect a LV tail servo?
- why is it a PS10 instead of a PS7?
- Why does Tower call this a "Futaba PS10 10Amp Votage Regulator Rx" when nothing about it is 10 amp? https://www.towerhobbies.com/cgi-bin/wti0001p?&I=LXBHZV

I suppose these are less critical questions. My dad taught me to be very careful of "why" questions- they are usually a dead end.

Those guys at Futaba got some 40 pound heads and I'm pretty sure they did something smart. Dr. Ben will be the source of the real answers.

Cheers on the 700XN build. Thanks for commenting. Sometimes I feel like I'm talking to myself.

"Well, Nothing bad can happen now."

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02-19-2018 03:39 PM  7 months agoPost 10
Four Stroker

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Atlanta

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The PS-10 is not much of a regulator. The originals (I had two of them) were recalled. They would randomly fail in flight and then reset or something. My 600N would drop 3 feet and rotate 90 degrees before the receiver (Futaba 6008HS) would catch up. Very entertaining. I send them in and received two new ones with a white dot. If yours does not have a white dot, send it in for replacement.

I tested the old and new ones by putting a 4 Amp load (big resister) on the output. At 6.6 volts input the output was 4.4 volts! This regulator is not good enough for a helicopter with real servos. I still have one running three 9202 analog servos - because I will replace them some day with 9250 5 Volt only servos.

On the other hand the PS-01 tail servo regulator seems fine and I have been using two of them for several years with typical 50 in-oz tail servos.

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02-19-2018 09:33 PM  7 months agoPost 11
Grimracer

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Eau Claire WI

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I have a bunch of these.. In Planes helis and boats.. Never had one give me a lick of issues. My big D7 has 3 of them in it for each of the power systems. same with my P-47.. I have them in some of my helis too BUT.. I am a scale pilot so I dont stress them all that much.
Grim

Michael J Zaborowski

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04-02-2018 08:21 PM  5 months agoPost 12
JLF92677

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Southern California

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In case anyone is interested, I ran some load tests on the PS10 this past weekend with the following results:

PS10 Specs:
Input Voltage Range: 6.0 - 12.6V
Output Voltage: 5.2V
Rated Output Current: 7.0A (momentary maximum 13.0A)
Operating Temperature Range: -10 to +45°C

Test results based on 3 minute intervals between load steps:
Source battery: Hobbico LiFeSource 3200mAh
Input voltage: 6.82V - 6.46V
Ambient temp: 21C
Load A.......Output Voltage
0.0.................5.350
1.0.................5.175
1.5.................5.103
2.0.................5.011
2.5.................4.903
3.0.................4.824
3.5.................4.732
4.0.................4.621
5.0.................4.511 PS10 Temp:36C after 24 minutes

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04-02-2018 10:48 PM  5 months agoPost 13
Four Stroker

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Atlanta

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That roughly agrees with my tests. I measured the output voltage after the connector on the resistor wires. That is, the resistor had a female Futaba connector on it and I measured the voltage at the resistor wires.

Why did you not go up to 7 amps? Anyway, that is not a 5.2 volt regulator.

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04-03-2018 12:30 AM  5 months agoPost 14
JLF92677

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Southern California

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Four Stroker
Why did you not go up to 7 amps?
Two reasons: 1) once I stepped from 4 to 5A the PS10 temp started to increase faster and did not want get into thermal runaway since the unit is rated a 45C max. 2) more importantly, the output voltage drop was so significant at 5A load that there was no point in testing it further.
Four Stroker
Anyway, that is not a 5.2 volt regulator.
Agreed!!! No question about it, very disappointing. It should only be rated for 4.9V and 3A continuous at best.

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04-03-2018 06:27 AM  5 months agoPost 15
wjvail

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Meridian, Mississippi

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Thanks for the update. Thanks for sharing the results. I don't think I'll be buying one. Your results are disappointing for a Futaba products.

Out of curiosity, what did you use to load the regulator during testing? Is there any chance you could load it to say, 13 amps? Even momentarily? Any chance you could feed it 5 or less volts and see what it does?

"Well, Nothing bad can happen now."

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04-03-2018 04:00 PM  5 months agoPost 16
JLF92677

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Southern California

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Hello Bill,
wjvail
Out of curiosity, what did you use to load the regulator during testing?
I used a Graupner Polaron to load the PS10 programmed for 4S NiMH discharge and a thermocouple. The Polaron allows you to change the load current on the fly, so I started a 1A and increased to 5A at 3 minute step intervals.
wjvail
Is there any chance you could load it to say, 13 amps? Even momentarily?
No, I don't want to risk failing the PS10.
wjvail
Any chance you could feed it 5 or less volts and see what it does?
I'll give it try later this week and let you know.

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04-03-2018 04:25 PM  5 months agoPost 17
wjvail

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Meridian, Mississippi

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JLF92677
I'll give it try later this week and let you know.
Thanks for the reply. I'm unfamiliar with the Graupner Polaron. Being able to use it as a load cell is a nice feature.

Please don't put to much work into this. It's pretty clear I won't be buying one of these. I think my interest in this is that I've come to expect better from Futaba.

"Well, Nothing bad can happen now."

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04-04-2018 01:59 AM  5 months agoPost 18
JLF92677

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Southern California

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wjvail
Any chance you could feed it 5 or less volts and see what it does?
Hi Bill, please keep in mind that this is not a valid test for the PS10 as same is rated for 6 to 12.6V input. Nevertheless, pursuant to your request I just took a voltage measurement with no load on the PS10 applying 5.05V input and output result was 4.22V.

Hope that helps,
Joe

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04-04-2018 02:23 PM  5 months agoPost 19
wjvail

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Meridian, Mississippi

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JLF92677
...please keep in mind that this is not a valid test for the PS10 as same is rated for 6 to 12.6V input. Nevertheless, pursuant to your request I just took a voltage measurement with no load on the PS10 applying 5.05V input and output result was 4.22V.
I was just curious what it would do if battery voltage dropped below the 6V spec minimum. Futaba receivers brownout at something around 2.8 volts so almost any battery type should continue to provide sufficient power as long as whatever voltage regulator being used goes into pass-through mode.

Thanks for the information.

Bill

"Well, Nothing bad can happen now."

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