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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Spektrum DSM › Fail Safe on Spektrum module
05-21-2007 08:11 PM  13 years ago
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wrathofkhan

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LA, CA - US

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Fail Safe on Spektrum module
hello,

my radio and receiver are already bounded together, but i can not set the fail safe ... is there any trick/s?

help !
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05-21-2007 08:29 PM  13 years ago
Rafael23cc

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Junction City, KS

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Consider this as a 15 minute bump.

I don't own anything spektrum yet, but as a future customer, I was reading up on the features of the products.

If you are talking about a plug in module for a JR or Futaba TX then I should tell you that my research pointed out that the Failsafe menu would be disabled, and not work that way. As a matter of fact, there should be no failsafe menu as you should have changed the Modulation from PCM to PPM in effect disabling the Failsafe menu. There is no menu to set the failsafe like we used to before.

Your new failsafe settings were programmed when you "bound" the TX and the RX.

Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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05-21-2007 08:57 PM  13 years ago
R/C Speed Nut

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Galesburg, Michigan USA

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Your new failsafe settings were programmed when you "bound" the TX and the RX.
Correct, the stick positions at bind are your "fail safe" positions.

Mike

Funky Chicken?!!..........I thought this was how you do a piro flip!!
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05-21-2007 08:58 PM  13 years ago
wrathofkhan

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the way you are supposed to bind it is, 1.put a supplied plug on the receiver and then turn the receiver on. 2. for fail safe position, there are no screens on the TX, basically the stick positions you bind it in at, is the position it goes to when it loses signal

unless, i am understanding something incorrectly ... or if i am supposed to do anything differently? thanks for your post ...
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05-21-2007 09:06 PM  13 years ago
wrathofkhan

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the reason i am thinking that the fail safe is not working is because

1. first i bind it, and i know the servo positions
2. turn the tx/rx/servos on (test them to see if they work)
3. turn off, just the TX
4. at this point, i notice that the servos do not go back to the predetermined positions (when i had initially binded them)

that is why i am thinking that the fail safe in my system is not working

is my conclusion wrong?
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05-21-2007 09:19 PM  13 years ago
R/C Speed Nut

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I think I remember reading that the system holds the last channel position except on throttle, but I could be wrong.

Edit: I just confirmed this with a quick search.

Mike

Funky Chicken?!!..........I thought this was how you do a piro flip!!
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05-21-2007 09:56 PM  13 years ago
midwestpilot

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Crystal Lake, IL

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You are correct..
All Channels hold except throttle.. which goes to the point it was at when you bound the receiver
In life there is no spacebar!

Rich Erikson AMA 6175
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05-22-2007 12:43 AM  13 years ago
wrathofkhan

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i will test it tonight with throttle on, and then turn the transmitter off to check if the motor quits or not.

thanks
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05-24-2007 07:46 AM  13 years ago
wrathofkhan

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OK, i did some research as well as actual test. i hooked up a servo to my throttle channel (i did try with live motor/lipo hooked up ... but that was way too scary for tests).

after binding, i turned both RX/TX off. then i turned them back on, and test the servos ... before turning off the TX. at this point, i was expecting the throttle/servo to go all the way to the bottom/failsafe throttle low position, but it didn't -- thank god, i didn't try this test with live motor/lipo.

anyhow, some of the materials i have read ... mentions to put the mid stick position as 'zero'/ATV prior to binding. haven't tried that yet, but that is the next test i will be doing ...
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05-24-2007 02:07 PM  13 years ago
kcass518

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Port Washington, NY - USA

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I don't know if this will help because I have tried to follow what you are doing and am not totally clear on what is happening. But, here's what should happen:

When you bind, the throttle stick should be all the way at the bottom of its travel. Then don't touch any of the sticks - they should be in their normal position. Bind the system as you have before. After binding, remove the binding plug and check to be sure everything works correctly. If so, with the Tx and Rx still on, move the throttle stick to its mid position. Then just turn off the transmitter. The throttle servo should then move to its fully closed position. That tells you that Fail Safe is working properly. If the throttle servo doesn't move, then there might be a problem. With mine, I power everything up, put the heli on the runway, and give it a little bit of throttle - just enough to get the blades spinning. If I then turn off the transmitter, the throttle goes to idle. This is how I've range checked it, too. I get the blades spinning slowly, push the bind button, and start walking. When the blades stop moving I know I'm at the limit of the range. This is all after about two weeks of experience with the DX7, so if any of this is wrong, someone please chime in and correct me. I'm learning the system, too!
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05-24-2007 02:14 PM  13 years ago
Rafael23cc

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Junction City, KS

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The problem that I see with binding with the throttle stick all the way to the bottom is that the pitch then would be at your negative value and will DRIVE your heli into the ground or make it shoot upwards if you are inverted in the event of a failsafe.

Think about binding as we used to think about failsafe in PCM receivers. Pitch to ZERO, throttle to idle. What combination of stick and switches causes that? Left stick to mid point and TH ON. then bind.

If it does not work in your unit, you might have to find a box and send it in.

Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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05-24-2007 02:22 PM  13 years ago
kcass518

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Rafael23cc,

If I understand the DX7 Fail Safe, wouldn't the pitch servo remain in the same position it was when the radio went into Fail Safe? In other words, I would think that only the throttle servo would be reduced to idle - all other servos would stay in the position they were at when the glitch occurred. It's not the throttle stick that moves down in Fail Safe - just the servo.

Ken
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05-24-2007 02:57 PM  13 years ago
midwestpilot

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Crystal Lake, IL

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You are correct...
the pitch servo holds postion in FS.

I think he is confusing low voltage reboot of the receiver with the fail safe.. two completely different things.

When the receiver reboots all servos go to the postion of the bind... so some folks are binding at mid stick and using a temporary throttle curve that sets motor at idle at mid stick.. then after binding change the curve back to normal... this way if you have a low voltage reboot of the receiver the pitch goes to "0" and throttle goes to idle.

Hope I have cleared it up...
In life there is no spacebar!

Rich Erikson AMA 6175
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05-24-2007 03:26 PM  13 years ago
kcass518

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midwestpilot -

Thank you for the clarification. Now I get it! That's why some people's models are slamming into the ground when they glitch. That makes a lot of sense.
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05-24-2007 05:36 PM  13 years ago
Rafael23cc

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I thought that the failsafe in the spektrum modules actually applied to all channels not just throttle. It does not make sense to me that we take one step back (failsafe) when we took a step forward (2.4gHz) 1 point towards keeping my PCM stuff.

I'll research a little more, as I said before, I don't own anything spektrum yet, but I'll keep reading on it's features until I do own and finally be able to read and experiemnt with it.

Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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05-24-2007 07:39 PM  13 years ago
kcass518

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The Spektrum system of Fail Safe actually makes much more sense to me than the PCM. In PCM, in the event of a glitch, your servos move to a preset position - presumably in the middle for straight and level flight. But what happens if you're doing a knife edge and you hit a glitch - the rudder suddenly cranks to the center and you're left with your mouth hanging open. With the DX7, the controls would continue to hold at their last position - i.e. still in a knife edge - but the throttle would drop to idle. Still not a good place to be, but at least your direction of travel would continue until the glitch worked out, at which time your throttle would come back up to your stick position. The only time your control surfaces would neutralize, or be different from their last position, would be in the case of a total lock-out, which would give you the same result as in PCM, presuming you programmed PCM Fail Safe to go neutral.
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05-24-2007 09:21 PM  13 years ago
helo_chris

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PCM systems will not go into failsafe just because of a glitch, it takes several seconds of sustained interference before this happens. You would never see a glitch at the servo on a PCM system, that is the point of using it. All of the PCM systems I have seen allow you to program either way, preset stick position or hold last."There is a fine line between cutting edge and bleeding edge.."
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05-24-2007 09:53 PM  13 years ago
Rafael23cc

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Like Helo_Cris said, PCM does not glitch, it goes into failsafe after an extended period of no connection with the TX. NO GLITCHING. That was the Step forward from FM to PCM.

Otherwise I was expecting Spektrum to be exactly like PCM. Being able to set-up the failsafe locations for the servos (for all of them), Not just the throttle. Maybe I don't want to spend the $$ on Spektrum. Thinking about it, averybody is going to spektrum, if I had very few frequency conflics before, I'm going to have even less now.

Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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05-24-2007 10:05 PM  13 years ago
kcass518

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I think my use of the term "glitching" was probably inappropriate. Substitute the phrase, "whatever puts your system into Fail Safe". I've read that 2.4 ghz are "glitch free", so clearly I shouldn't be using that word.
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05-24-2007 11:08 PM  13 years ago
d_wheel

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Deep in the heart of Texas.

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It is my understanding that the new 9 channel receivers have the ability to be programmed either way. Hold or preset on all channels.

Later;

D.W.
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