Eddie Lozano

Having trouble setting up my new radio with ATJ-120

After I go through set the ECU, I get a message " LOW trim Radio is not properly set".

I've follow these step.

1. Set up ECU throttle in channel 3.

2. Select End Point (ATV) menu.

3. Set channel 3 throttle ATV limits to 135%.

4. Set channel 3 throttle TRAVEL limits to 135%.

5. Set throttle stick and throttle trim to full low. (Set trim for fast travel)

6. Select Linkage/Fail Safe menu.

7. Save Channel 3 F/S POS with stick and trim set to full low. (Should be approx -135%)

8. Select End Point (ATV) menu.

9. Set throttle TRAVEL to 50%. (The objective is to get enough millisecond spread between the F/S setting of 135% ATV and the 50% TRAVEL limit to trigger the ECU fail safe with signal loss. The range of the throttle TRAVEL settings is not critical. Could use 60% or even 40% if necessary.)

10. The throttle ATV and TRAVEL settings must be set in each TX condition used on the model. Use Group and Condition copy on TX programming if possible.

11. Set throttle stick and throttle trim to full low.

12. Perform Learn RC procedure on ECU described in ECU manual.

13. Check for ECU fail safe with TX off at all throttle stick and trim positions.

14. Check for ECU fail safe with TX off in all TX conditions used on the model. (Takeoff, Land, Normal, 3D, etc.)

Thanks

quist

My Feedback: (198)

Is your trim rate still at 30%?

And your trim step at 200?

Trim mode ATL?

ATL reverse on NORM?

quist

My Feedback: (198)

With the Jetcat ECU I have never needed that large of a spread to activate ECU failsafe mode. I set my failsafe at 125 and fly the plane with an atv of 100.

Eddie Lozano

Here's what i Have

CH Func Limit Travel -|- Travel Limit Speed
3 Throtle 135% 135% 135% 135% 0


Fail Safe

Mode B.F/S F/S Posi.
3 Thro Hold B.F/S +0%


Is your trim rate still at 30%? ... how do you set the rate ..

And your trim step at 200? ... how do you set the step

Trim mode ATL? how do you set the trim mode

Sorry I am stupid

ww2birds

My Feedback: (14)

Sounds like quist has you covered. I've set up many turbines on my 14mz, but not the one you have .. but from my own experience:

Critical item #1: on every turbine ECU I have set up, you have to use reverse on the throttle channel since the ECU manufacturers assume you are using a JR radio.

Critical item #2: (what I think quist is getting at) .. some ECUs want more "travel" on the trim than the default setting so you have to go into the trim setup and make the trim range larger so the ECU sees a bigger difference between low throttle and off. It is enlightening to look at the servo monitor screen as you change these settings.

Regarding failsafe: Agree that +/-100 on ATV is fine .. I do the "learn" with +/-100, then I enable the failsafe shutdown on the ECU (if it has that setting) .. then take the throttle to shut down position, then go to the ATV screen and watch the ECU controller .. as you start increasing the ATV above 100 on the low side you will eventually see a point where the ECU controller indicates failsafe .. then you know the ATV setting that will ensure a failsafe, go 5-10% more for good measure, then go to the failsafe screen, set throttle failsafe to the current setting, then back to ATV and reset ATV back to 100. Sounds complicated but actually is not...

I suppose if you did the above and never saw an ECU indication of failsafe you could "learn" at +/-80 or 60 or even 50 but I've never had to.

Best of luck.

Also, FWIW, on my 14mz I change the function menu so that the top left slider becomes the throttle trim, making it analog and its position visible (like the JR .. they had a good idea there!).

Dave

quist

My Feedback: (198)

If you change the step of the trim to 200. 2 clicks take you from low to high idle. On my buddy jets I set it up using the Left dial, he likes that method.
I have never had to reverse anything for the Jetcat ECU.

Tony

Eddie Lozano

I reversed the throtle and it work. Thank you guys for all your help.