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2.4G Spektrum Radios Spektrum 2.4 Gigahertz Radios and Technology

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Old 03-08-2021, 11:41 PM   #1 (permalink)
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Default DX8 g2 low voltage alarm not working

Hello folks, first time posting and looking for some help.

I can't get my low voltage alarm on my DX8 g2 to work, as soon as I power on a model the warning screen comes on showing my current voltage. The voltage is still over the value I set in the telemetry menu, it doesn't matter what value I set as soon as I exit telemetry menu the warning comes on. When I exit the warning screen the warning doesn't come back on when I reach my set limit.

I have tried on all 4 of my helis which do have functioning voltage telemetry displayed on the transmitter.

Horizon tech support hasn't been any help, updated the Dx8 to v2.08 and it did nothing. Starting to wonder if it's a possible hardware issue? If anyone has any tips or similar issues I'd appreciate some feedback.
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Old 03-09-2021, 01:33 PM   #2 (permalink)
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If I understand you, the DX8g2 shows no warnings until you power up the model. Then the low voltage warning from the model's voltage telemetry warning pops-up (right?).
Of so, this is kind of normal.
On power up, the receiver's telemetry initializes the link to the transmitter before it has all the senor's valid data. And, many times the transmitter will see 0v for a second, followed by the actual voltage. That 0V is enough to trigger the warning.

Which voltage telemetry is being reported? If it is the Receiver Voltage, the only time it drops low enough (for me) is when I turn off the BEC and the backup power supply takes over - that is a 1/2v drop and it is enough to trigger the alarm.
But do not expect the voltage warning to pop-up when you power off the BEC. Once the BEC is off, the telemetry link is dead. With no data, there should be no more warnings.
But, every once in a while, I get a warning or two when I power off. I just attribute them to the last gasp of the receiver before it dies. But, I wouldn't expect to get them all the time.

Assuming the model is still power up, you should still be able to get the next warning if anything drops below the threshold you set.

On your voltage telemetry screen in the transmitter, what are the settings for Status Reports and Warnings?
I have my Receiver Voltage "Status Reports" "Inh" and the "Warning Reports" "10 Sec".
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Old 03-09-2021, 03:12 PM   #3 (permalink)
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I have set my voltage and current readouts to become active when I flip the Hold switch off. The low voltage warnings I have left active as a separate warning but changed the time frame it is called out so it is not so annoying. As long as the Hold Switch is on, the flight battery voltage is not called out, nor is the current. I have them set under Audio Events/Custom Reports. Hope this helps.

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Old 03-09-2021, 10:05 PM   #4 (permalink)
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Yeah correct, alarm comes on right away. I have found that the alarm also comes on right away after exiting the telemetry menu trying to change settings as well, meaning the model is already powered up.

The voltage type is the ESC voltage which I assume is the meassured amount of actual flight pack voltage.

In the ESC telemetry menu I have:
Volts min with alarm set to voice
Amps max Inh
FET temp max Inh
Poles Inh (depending on model)

Status report Inh
Warning report I tried Inh, 5, 10, 15, sec and so on and it made no difference.

I did set my D switch to voice out my ESC data if I want to find out my pack voltage without looking at the screen.
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