Thread: Amperage values "float" during flight with Dynon 1

I'm wondering if anyone has or is experiencing amperage readout "float" with the Dynon 120. 2008 CTLS shows constantly variable amp readout on Dynon amp meter. The amp gage appears to be a "random number generator". It constantly shows first high positive amp readings, then goes to negative readings and then back to positive. Operation of equipment, landing lights, etc., don't appear to affect this "float". The voltage meter reads constant +13.4 to +13.6 and appears to be OK and the charging system appears to be charging battery with no apparent loss of charge over time. Connections have been checked at voltage regulator. Any thoughts? Thanks.

Dick

I had a similar problem that would sometimes set off the high current alarm in the Dynon from going to -15A. Sebring Aviation said they replaced the fuse for the Dynon ammeter. I flew two hours today and no reoccurrence so far.

Mine does the same thing - has since new. The alarm has never been set off though. CTLS 08-03-08.

Glenn and Philip, thanks for the replies. We do get occasional red light and warning tone. I will have to look at the Dynon manual to see if there might be a setup parameter that is responsible for monitoring amperage limits?

I have the same problem with indication that it is not charging and then comes back after a while. No solution found yet. Wonder how long the plane would run on battery only.

The dealer said they actually replaced a fuse for the Dynon ammeter. I assume there is a fuse to be found on the port that reads the amperage in the system. They tried replacing the voltage regulator and that did not change anything. I flew two more hours today and no alarms. Previously, I would have had an alarm at least once. You could call the tech line at Sebring Aviation and ask where to find this fuse and how to replace it.

There is a shunt and fuses. The shunt is behind the D100 and looks like a metal bus bar between two contact points. The fuses are right behind the D120 in black plastic fuse holders. All these are easy to replace if need be.

Ah-ha! Great info. This forum is so helpful. I know that the ammeter shunt handles a lot of current and was wondering how the system was protected should a short occur. Makes sense that the fuse needs to be there but didn't know where to look (thanks Roger). Believe that this might be the problem because of the floating values. With an open shunt circuit, there's no current there for the ammeter to show. Thanks to all for the good info.

RFDESAM, you say that your problem is "no charge"? This is differnt than the floating amperage. We experienced a "no charge" concern and the cause of this was a dislodged pin on the voltage regulator connector. I have also been told that there have been a few "problem" voltage regulators replaced but have not experienced this concern. The CTLS can be flown for a good while without charge coming in but I wouldn't make a practice of doing this.

Dick

Run to eat: I like the name, that is my wife's daily chant while running...

I had the same problem, checked everything, but could not find the solution. I finally just adjusted the alarm parameters in the Dynon. I will recheck the Dynon fuses after reading this though.

My Ammeter has done the same thing from the beginning. I only watch battery voltage. Replaced the wiring and two D180's and no change.