Anyone wishing to register, once you have, PLEASE CHECK YOUR SPAM FOLDER for the confirmation email. There are a lot of people registered but not activated their accounts.

frsky rb-20

Discussion about Tx, Rx, Servo's, Batteries, Chargers, and all the other things we like to talk about..
Moderator: VinceC
Post Reply
jack
Posts: 48
Joined: 20 Mar 2015, 21:55
Location: chepstow,south wales

frsky rb-20

Post by jack » 11 Mar 2019, 17:48

Hi all,well,l have progressed the B4 to the gear install stage,l have just fitted my new RB-20 redundancy bus,but it seems like l have a problem with it,at first all seemed fine,my u/c and doors were going up and down in fine style....then my tx started shouting at me,warning power overload-servo overload,which it kept repeating.....this got my attention,it not being something l had set up or even heard before :o ,investigation followed,but all seems to be fine,this warning is produced even after l pulled all the servo plugs from the rb-20 :? ,l also removed the back up power lead so l know its not an overload,the fact that the warning happens even when no servos are connected is worrying :? ,does anyone have any ideas as to the cause :?: ,the instruction sheet states that the rb 20 does have overload protection on each channel,but l cant see why its activating with nothing but the power lead plugged in and only supplying 6 volts...maybe my rb-20 is faulty :?: any frsky gurus out there have any suggestions :?:

User avatar
Barry_Cole
Posts: 1166
Joined: 10 Mar 2015, 09:30
Location: Hampshire UK

Re: frsky rb-20

Post by Barry_Cole » 11 Mar 2019, 19:15

Jack,
I will inquire, of those that know these things.

:D :D :D :D

BC

User avatar
Simon WS
Posts: 272
Joined: 18 Mar 2015, 11:39
Location: Kent, UK

Re: frsky rb-20

Post by Simon WS » 12 Mar 2019, 14:31

It would be unfair of me to "rubbish" a product based on one experience (and in general I love Frsky products) but a friend of mine used the RB-20 in his 7m Let glider and lost complete control on the maiden and the model was partially destroyed. He is convinced that the RB-20 was to blame but obviously we can't be certain.
Personally I go for a simpler route when I need lots of channels by using two receivers each with their own battery and build in as much redundancy as possible (one elevator for each receiver etc)

Simon

jack
Posts: 48
Joined: 20 Mar 2015, 21:55
Location: chepstow,south wales

Re: frsky rb-20

Post by jack » 13 Mar 2019, 19:25

hi people,an update on my RB-20 troubles,so far neither myself or barry have been able to come up with an explanation for this problem,richard at T-9 has been really helpful,couldnt ask for better response from a supplier,but,l still have a unit that l cant trust....the fact that the "power overload and servo overload" are still generated even after unplugging everything bar a single power lead suggests to me that its an internal fault,l updated my Tx to the 2.2.3 release but this made no difference.....l have now returned the unit to T-9,for replacement,l have asked Richard to let me know the outcome and will post it here,Simon,l have just read your reply post and its a bit concerning to say the least :( ,but like you l do like frsky stuff,it would be of interest to hear from people who may have had incidents with the RB-20,anyway,l will be having another as soon as Richard can supply one,will let you all know how l get on :!: :!:

User avatar
Barry_Cole
Posts: 1166
Joined: 10 Mar 2015, 09:30
Location: Hampshire UK

Re: frsky rb-20

Post by Barry_Cole » 13 Mar 2019, 20:17

There are plenty of posts on RC-Groups from people who are using them very successfully on large IC planes and fast jets.

:D :D :D :D

BC

Elliot Howells
Posts: 151
Joined: 18 Mar 2015, 08:18
Location: West Wales
Contact:

Re: frsky rb-20

Post by Elliot Howells » 13 Mar 2019, 22:15

Interested to see your prognosis, I have an RB-20 waiting for a model...

Ell.

User avatar
Cliff Evans
Posts: 1419
Joined: 13 Mar 2015, 10:32
Location: Bristol
Contact:

Re: frsky rb-20

Post by Cliff Evans » 14 Mar 2019, 07:47

Have you checked to see if there is a firmware update for the unit itself!

There is also a thread on RCGroups that may help with the problem, https://www.rcgroups.com/forums/showthr ... st40597131
The user there with the user name of "webbsolution" may be able to help as I beleive he has written some of the firmware for FRSky.

jack
Posts: 48
Joined: 20 Mar 2015, 21:55
Location: chepstow,south wales

Re: frsky rb-20

Post by jack » 15 Mar 2019, 20:17

Evening cliff,had a look on rc groups,the problems are more or less the same as those l am having,in my case l was getting the warnings as soon as l switched on....even when l had nothing but a single 6 volt feed connected :? ,l checked the voltage being supplied and got about 6.80 on a freshly charged nimh pack,these units are rated up to 8.4 volts so it was definitely not overloaded,its gone back to T-9 now,hopefully Richard can get to the bottom of it,presently l am using an x8r to set things up with no trouble at all,so ,as far as l can see,its all pointing to an internal fault of some kind in the RB-20,possibly related to the overload protection on the channels :?: ,all the best,jack.

Post Reply