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02-13-2022, 09:50 PM | #1 (permalink) |
Registered Users
Join Date: Jul 2011
Location: SW Suburbs of Chicago
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Jeti rpm hall questions
I’m having issues getting a jeti rpm hall sensor to work properly. In operation the calculated headspeeds are way too high. I have the sensor properly configured using device explorer with a gear ratio of 8.8.
However, I can’t find any info online regarding the actual installation of the magnets and sensor and think that this may be causing my issues. I currently have two magnets installed, one has the North Pole towards the sensor, the other one is flipped the opposite way. I’m also not sure if the sensor itself needs to be oriented a specific way to read properly. Unfortunately the jeti instructions just deal with the firmware settings and don’t provide guidance regarding the physical installation. Thanks in advance for any help.
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Raw700-G, Raw 700 KSE-G, Protos700-G, Glogo 690-T, Whiplash-T, 2x KingTech 800-T, Vario Bell 47 |
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02-15-2022, 04:44 AM | #2 (permalink) |
Registered Users
Join Date: Apr 2007
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Hi,
Finally another user with issue. I posted similar question and got zero answers. I have hall fitter to heli reading one magnet on main gear. I get all sorts of readings from 800rpm to 3000rpm. As it’s a simple one magnet setup it should just count but it seems to want to multiply and I done know how. I have a gitana gov with its sensor mounted on motor and its works perfectly and just want the jeti ball to from radio reading of headspeed. Let’s see if we get answers. Sent from my iPhone using Tapatalk Pro |
02-16-2022, 06:49 AM | #3 (permalink) | |
Registered Users
Join Date: Jan 2014
Location: Glendale, AZ
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Magnets active, Sensing Divider, Sensor
While trying to get the Spirit governor to work with my gasser, I learned a few things that might be helpful. I fly with Jeti and Spirit FBL. Maybe some of this info will be helpful, although maybe not specific to your FBL/Governor.
Spirit FBL - governor requires: The magnet(s) must be active, if using more than one magnet they all need to be active. I didn't think it would matter if I had two magnets, one north, and one south (active/inactive), but Thomas of Spirit System posted here - they both (all) need to be active. Unfortunately, in my case, the magnets I need to use are manufactured as part of the engine flywheel and can not be changed. The sensor orientation matters. Typically the flat side of the chip faces the magnet. Connect the sensor to your spirit and use the RPM sensor testing in the Spirit settings software to verify magnet and sensor orientation. Also applies to external governors, e.g. MultiGov Pro sensor test, as one example. I saw another post about wild RPM readings (Spirit governor), the problem, in that case, turned out to be the sensor not connected correctly. At one point, with the sensor connected correctly, I too had wild RPM readings - I tried a different sensor and the problem went away. I'm using the Xgaurd sensor inside the engine fan case (reading off the flywheel) and an Aerospire sensor on the outside of the case, also triggering off the flywheel. On my gasser, I'm using the second sensor [connected to the Spirit] for telemetry only - to my Jeti radio. The signal I get back to the radio is clean enough for telemetry readouts, and logging, however, I see drops to 0 RPM throughout the log file. I suspect this is due to the magnet arrangement on the flywheel and the reason I can not get the Spirit governor to engage.I resolved to use the Aerospire MultiGov Pro [because I can not change magnet orientation] and it worked on the first try. Sadly, I was not able to get the Spirit governor to work on my Gasser. I did, however, use the Spirit governor with good results on a Nitro heli. With the help of a friend at the field and his optical tach, we verified the head speed is accurate as shown by telemetry, setting aside the 0 RPM drops. I also tried a 'Y' connector and shared the signal from one sensor between the MultiGov and Jeti telemetry. It worked on the bench, but I didn't "feel" comfortable with the configuration so I settled on two sensors. Note: By Jeti telemetry, I'm speaking of the telemetry reported to Jeti from the Spirit. Even though I have two magnets, one active and one inactive, the Spirit is sending accurate telemetry to the Jeti TX, but with RPM drops to 0. Head Speed not matching caculated Verify your Sensing Divider is set equal to the number of active magnets you are using. Lastly, verify the gear ratio is set correctly for your heli.
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------------ Kevin Helicopters: If you have too many, you're sure to have enough! TDSF, DIABOLO-700 '18, SOXOS, MA Whip-E/G, Interceptor, JETI+SPIRIT GTR Last edited by Roadkinghd; 02-16-2022 at 07:19 AM.. |
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02-16-2022, 06:28 PM | #4 (permalink) |
Registered Users
Thread Starter
Join Date: Jul 2011
Location: SW Suburbs of Chicago
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Thanks for the detailed replies and suggestions. I’m going to go through my setup one more time to see if I can get it to work. I have used vcontrol and frsky systems with cheap align rpm sensors and two magnets oriented as indicated in my first post and they have worked on multiple gassers without issue. I was unable to find anything regarding magnet installation in jetis instructions.
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Raw700-G, Raw 700 KSE-G, Protos700-G, Glogo 690-T, Whiplash-T, 2x KingTech 800-T, Vario Bell 47 Last edited by GRR45; 02-16-2022 at 06:58 PM.. |
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