Low voltage protection

KopterX

KopterX

Member
"Line loss" setting is to small. You should put about 0.1V per cell, that's 0.3V for 3S (assuming your battery is new, for older batteries this value will increase)

"No Load" settings looks ok. You may try different "No Load" values for first level protection, until you get about 30 seconds between orange light and red light. Keep the same "No Load" setting for second level.
 

T

toptweaks

Member
KopterX said:
"Line loss" setting is to small. You should put about 0.1V per cell, that's 0.3V for 3S (assuming your battery is new, for older batteries this value will increase)

"No Load" settings looks ok. You may try different "No Load" values for first level protection, until you get about 30 seconds between orange light and red light. Keep the same "No Load" setting for second level.
Click to expand...



Thank you very much for advise KopterX

will change this value and look how it goes ... by the way any recommended telemetry system ... a link ...


thanks
 

N

nisouck

Member
I think you have a problem wtih the voltage monitor, "disconnected" is not normal.

View attachment 4672
 

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KopterX

KopterX

Member
toptweaks said:
Thank you very much for advise KopterX

by the way any recommended telemetry system ... a link ...
Click to expand...

1. Quanum http://www.hobbyking.com/hobbyking/...hz_Telemetry_System_Volt_Amp_Temp_mAh_V2.html
Very nice standalone solution that support up to 100 A current. Also the cheapest!
The current and temperature sensor is sold separately. Might take a while until you will receve it from Hobby King. Apparently they bought Quanum.

2. http://www.graupner.de/en/products/ad5bb423-3174-4c1b-aad2-6920ad769c15/33620/product.aspx
Good solution but this works with only with Grapner HOTT trasmitters, you will also need this Smart-Box http://www.graupner.de/en/products/33700/product.aspx
to program alarms and display telemetry.

3. The high end, overkill version: http://www.eagletreesystems.com/Pro/pro.htm. Does a lot more than just monitoring the battery pack. Expensive.

4. Other high end option: http://www.flightcommand.de . German only website, but really good stuff. Similar with Quanum but high end. I like this one. Expensive.

5. for Spectrum tx systems http://www.spektrumrc.com/DSM/Products/airTelemetry.aspx

I hope soon i will be able to compare all of them, and come back with a detailed review.
 


T

toptweaks

Member
hi ...

ok had made changes,

is this setting is okay as below, i am using 3s and sometimes make paralel connection with 2 3s lipos


voltprotect3.png
 

T

tppeng

Member
Since KopterX already went into details about "working voltage" vs "nominal voltage", I am going to skip lecturing you again.

Bare in mind: ALL battery brands have this working voltage drop and it varies among different chemical compounds and again, manufacturers.
Different cell count will have different loss, too.

Let me share a little of my experience when setting this battery protection function to have it working properly...

It is perfectly okay to set your loss as 0.00v in the BEGINNING of your setup. Using 3S Lipo as an example, here are the steps:

1) Set the loss to 0 and No-Load to 11.1 for First level, and set second at 9.9v (or 10v), setup timer on your transmitter in "count up" mode when throttle is raised over 25%

2) Have a fully charged battery, put your multirotor into hovering till the yellow flash kicks in.

3) Gently land your copter, and use a voltage meter to check your overall voltage. In most cases it should be 11.4~11.7. If too much then your battery's compound is below average (Explained below)

4) The difference between the voltage you just measured and the set 11.1V is your working loss, put that value in the Assistant Software

5) Set desired value for No Load and you will have a proper protection setup.

6) (OPTIONAL) I use the time counted by the timer for my Tx Alarm, it gives me a rough idea when I should start to bring my bird back.

Now, every brand will have different chemical compound ratio in their batteries, this will usually give you different Loading Loss. With 4s lipo I use on my copter,
Turnigy nanotechs have loss between 0.6V to 0.8V. I found this quite annoying because it will not fly as long as some other brands do. Some regular turnigys even got 1.0V loss.
Thunder Power has loss range between 0.3~0.4 for the same 5000mah 45C 4S battery, hence I swap all HK batteries to TP.

Take your time finding the right LOSS for your battery, and setup No-Load voltage accordingly to KopterX's previous post, you would have a safe machine.

BTW, ever since 5.0 I start using this function, and among 5.0.2~5.0.4~5.0.6 and even to the most current 5.0.8, they have all function properly.
 
Last edited by a moderator:


L

LarsNiko

Member
Voltage problems
Hi guys,
I recently bought a Secraft conversion kit and fitted a GH3 on to my standard S800. No retracts, just a video transmitter other than the camera.
I have two Turnigy Nano Tech 6S 6000mAh, 25-50C batteries at about 1800g.
Yesterday I reseted the voltage protection as I need to do a new calibration with the new weight and all. As first level protection I have 21.6V and on second level 19.8V.

I went out to do a test flight and first level protection kicked in after around 7 minutes. I went inside and measured the batteries to 23.05V and that tells me the line of loss is 23.05-21.6V = 1.45V, correct?

However, the WKM assistant won't let me put in any higher value than 1.2V?
What am I doing wrong? Is my line of loss to big? Is my rig too heavy? Did I do the test flight incorrectly? I got 4 yellow flashes at first, landed and realized it should continually flash yellow so I went up again for a short time until it started to do so. (The first 4 flashes I don't know what they meant?).

Any ideas? Any answer will be much appreciated!
 

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