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HomeAircraftHelicopterRadio - Futaba FASST › Gov not engaging or disengaging
06-17-2014 04:36 AM  4 years agoPost 1
RM3

rrElite Veteran

Killeen, Texas - USA

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Hi Guys,
Been out flying my gassers and I have a CGY750 that seems to not engage or sometimes disengages.

The CGY750 is new BTW.

I have magnets mounted to the main gear with the sensor mounted on the frame to pick them up...When testing the sensor output, when each magnet passes it registers as 96%.

The home screen on the CGY will indicate that the GOV is on (or off when disabled by the TX).

When flying sometimes the govenor is working, but when I go into idle up 1 or 2 the speed increases well over the set speed in some cases up to about 2500 rpm on my Radikal G20. Yet it seems to hold at a much higher speed, just not the speed I set it at, then sometime just hovering, the speed will settle down to the actual HS I had programed into the CGYs Gov. All the settings are correct, I have tripple checked them and have lots of experience with the CGY750.

It is possible the sensor does not work when on the bench but fails to pick up the magnets when its running and therefore "misreading" what the actual HS is?

showing a preference will only get you into trouble, 90% of everything is crap...

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06-17-2014 09:13 AM  4 years agoPost 2
dkm

rrNovice

sydney, Australia

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"I have magnets mounted to the main gear with the sensor mounted on the frame to pick them up...When testing the sensor output, when each magnet passes it registers as 96%."

You should only have one magnet working with the pickup on the main gear.
If you have fitted the second magnet to balance the gear, it should be fitted upside down (reverse polarity) and should not be sensed by the pickup.
Also check how you have the stick switch position set up.

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06-17-2014 01:05 PM  4 years agoPost 3
Pistol Pete

rrProfessor

Seffner, FL

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If its reading both magnets, flip one or half the ratio.

Edited
Also wiggle ( gently ) sensor wires while testing on bench as it could be an intermittent connection due to vibs..

~~Enjoying the hobby one flight at a time~~

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06-20-2014 02:24 PM  4 years agoPost 4
RM3

rrElite Veteran

Killeen, Texas - USA

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You should only have one magnet working with the pickup on the main gear.
I have 6, and the gov is set up for a ratio of 6:1...therefore the ratio is correct and the 6 magnets allow me to get a better resolution on HS as its reading from the main gear and not the engine. Now I could go with just one or two at set the ratio acordingly...but were is the fun in that.

I suspect the sensor is bad...

cause like I said, sometimes the gov works, sometimes it does not.

showing a preference will only get you into trouble, 90% of everything is crap...

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06-20-2014 02:58 PM  4 years agoPost 5
Mark Dean

rrApprentice

Maryland

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It could be the On/Off switch position
I would suspect your 6:1 ratio. You should be using 2 poles only on a gas engine. I also have seen the following.
If you have a switch set up for gov on/off and the switch is in the on position during power up the gov will never activate and will show a triangle with a ! in it. On firmware 1.3 you can toggle the on/off switch to get the gov to activate if you power up with the switch on, but I have noticed that the gov doesn't function quite right this way. Either disable the on/off function or ensure that the switch position is off during power on.

Mark

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06-20-2014 03:06 PM  4 years agoPost 6
Pistol Pete

rrProfessor

Seffner, FL

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Did you have the same issues before going with six magnets?

Perhaps too many magnets for main gear size.

~~Enjoying the hobby one flight at a time~~

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06-20-2014 04:22 PM  4 years agoPost 7
RM3

rrElite Veteran

Killeen, Texas - USA

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The main screen will show that the Gov is "on" when I want it to be on and off when I want it to be off...I have both a switch and throttle position to control the gov. basically I have an "enable" switch on the TX to enable the gov, but the gov will not engage until the throttle is at a minimum position. It worked just fine with the GV-1 even with the 6 magnets and similar setup.

now with the 750 it seems that its not reliable despite the sensor working just fine and the setup is done correctly (have not checked for intermittent sensor failure yet) and it sometimes works...its must be a wire "somewhere".

showing a preference will only get you into trouble, 90% of everything is crap...

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06-20-2014 04:38 PM  4 years agoPost 8
Mark Dean

rrApprentice

Maryland

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The main screen will show that the Gov is "on" when I want it to be on and off when I want it to be off...I have both a switch and throttle position to control the gov. basically I have an "enable" switch on the TX to enable the gov, but the gov will not engage until the throttle is at a minimum position. It worked just fine with the GV-1 even with the 6 magnets and similar setup.
Understand. You probably have a bad sensor as you said, but I am set up the same way, with exception of the 6 magnets. I thought maybe your gov was not turning on because of the same issue I have. As I said, I am set up with an on and off switch. I also have min throttle stick activate, and gov disabled by speed under 1000 in normal condition. I must turn the on/off switch to the off position or the gov will never activate.I did not have this issue with the GV-1. Good luck.

Mark

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06-20-2014 05:22 PM  4 years agoPost 9
RM3

rrElite Veteran

Killeen, Texas - USA

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I found the issue,

I had to go into the expert menu...

setting for LowLimitHover and LowLimitIdleUp were set too high (needed to be under 30% and 30%)...since the weather has warmed the needle settings had to change (which also needed a slight change in throttle positions to get optimal power from my modded 22cc) and this was no longer in line with what the minimum "low" settings were with the CGY750 Gov.

lesson:
"When everything 'normally' checks out...check the 'expert' menu"

showing a preference will only get you into trouble, 90% of everything is crap...

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06-20-2014 06:18 PM  4 years agoPost 10
Mark Dean

rrApprentice

Maryland

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Great.
I am curious to what your settings are now?
What are the limits set to and what are your throttle curve values?

Thanks,
Mark

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06-20-2014 08:10 PM  4 years agoPost 11
RM3

rrElite Veteran

Killeen, Texas - USA

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for now in the expert settings the LLhover is set to 22% and the LLimitIdleUp is set to 30% after a driveway "test", basically matching the throttle positions that will allow the engine to not go under idle setting in hover mode and for idleup, to keep the engine speed over Normal and below idleup speeds (when the Gov is disabled).

when I went into the expert settings they were set to 40% and 60%...which was way to high.

need to adjust these at the field today a tad bit more...if they are not optimal, you will notice that the engine almost dies sometimes after the HS overspeeds (and the engines recovers) OR like what happened to me the engine never settles down to set speed when under a light load and tends to exceed the HS settings for all flight modes.

anyway,

The throttle curves are at 20% 25% 30% 40% 80% for normal
the throttle curve for idleup 1 and 2 is 90% 45% 40% 45% 90%

I don't go to 100% cause during testing, opening up the carb to 100% actually lead to a slight drop in output power.

showing a preference will only get you into trouble, 90% of everything is crap...

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06-20-2014 08:15 PM  4 years agoPost 12
Mark Dean

rrApprentice

Maryland

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Thank you. I was curious about how close others would be running the limits to the throttle curve. I have bee setting mine almost the same as mid stick throttle curve values on Idleup limit and just above an idle on hover limit.

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06-21-2014 02:10 PM  4 years agoPost 13
Pistol Pete

rrProfessor

Seffner, FL

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Seems like expert settings in the 750 sounds similar to the hidden menu of the GV1.

Good to know...thanks for sharing.

~~Enjoying the hobby one flight at a time~~

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