HELP ! MMP + Spektrum RX = cutting out ?

[Arct1k]

An ultra HT servo such as the 7955TG or 7950TG I've shown to pull 4amps at stall... The MMP bec is just not comping... An extra CC bec is a pain but compared to what we used to do its a small price to pay

[Stoomstrijkijze]

Originally Posted by BashemSmashem

Well , I also went too the LHS and picked up a CC 10a BEC , put it in and it seems to have cured my problem ? So why cant the BEC in the Mamba Max Pro do the job ? Is there some kind of fault with them ? I am using a high torque servo (JR 9100T) but I use that servo in all my 1/8th scales and the MMP ESC is the only one that is giving me trouble .

That servo is known to be a current eater

[kingdomracer]

I'm following but what I want to know is; if using the 7950TG and MMP with a 2s setup could you get away with just adding the 10,000uf 10v cap or should you still put in a CC BEC because of the HV servo. If that's the case would changing the servo make then an external BEC unnecessary?

[bryan]

I personnaly would rather have a cc bec on my ten than a cheesey servo.
just my .02

[kingdomracer]

I guess I should've been more specific. I was thinking instead of using the 7950TH to switch to my 7955TG which isn't HV. In that case would I still need an external BEC on 2s? And is it ok to put say 3 x 4600uf 10v caps in series to be closer (well actually way over) to BrianG recommended 10,000uf 10v? Thanks BrianG for a reply.

[bryan]

i actually had problems with a similiar servo.Not the hitec 7955tg,but the hobbico ct170,or cs170,anyway basically the same servo per the specs.So i would say no. BEC should solve your problems.Buy the cc bec pro so we can get some feedback on it.I've been concidering one.

[kingdomracer]

Originally Posted by bryan

i actually had problems with a similiar servo.Not the hitec 7955tg,but the hobbico ct170,or cs170,anyway basically the same servo per the specs.So i would say no. BEC should solve your problems.Buy the cc bec pro so we can get some feedback on it.I've been concidering one.

You buy Hobbico servos and use the word cheesy in your other post
And please post help according to a person's application. I'm using a 2s setup why would I want a CC BEC PRO that doesn't even make sense. Like I said I'll wait for an answer from BrianG, thank you!

[Arct1k]

A 7955 and 7950 both pull about the same at stall from my tests - You could try adding the extra 10000uf capacitor however thats about as big or bigger than a CCBEC...

I've done tests etc and already put up results of the CC BEC Pro - I use one on my comp super (crawler)

[SpEEdyBL]

I would just go with a medium size digital servo. I run a futaba s9551 low profile servo in my 1/8 buggy because of the problem. Despite only 122 in-oz of torque, it gets the job done. The JR9100s causes bad glitching and the spektrum s6040 makes a complete joke out of the bec all together. One twitch of the steering and the esc resets itself.

But seriously though, Castle needs to get their act together on this. This has been a problem from day one and I have not heard a word from them addressing it in the last 6 months. I've posted complaints here twice.

I've gotten replies such as:
"It only seems to be a problem with a particular servo." Not the case. Seems to be any high power digital servo that is causing the problem and it put me back $80 to find that out.

"You probably have a bad chip." Maybe two? in each of my escs that seem to be working normally otherwise?

"A power cap should solve the problem because it's the current spikes created by the servo when it changes direction." Been there, done that. No go.

Face it, it's time that Castle takes some heat on this. They could at least be proactive and let people know what is going on. When I people who are newer to the hobby running into this problem and have gone painstakenly out of their way to pinpoint it without luck, it really gets me.

Originally Posted by SpEEdyBL

I would just go with a medium size digital servo. I run a futaba s9551 low profile servo in my 1/8 buggy because of the problem. Despite only 122 in-oz of torque, it gets the job done. The JR9100s causes bad glitching and the spektrum s6040 makes a complete joke out of the bec all together. One twitch of the steering and the esc resets itself.

But seriously though, Castle needs to get their act together on this. This has been a problem from day one and I have not heard a word from them addressing it in the last 6 months. I've posted complaints here twice.

I've gotten replies such as:
"It only seems to be a problem with a particular servo." Not the case. Seems to be any high power digital servo that is causing the problem and it put me back $80 to find that out.

"You probably have a bad chip." Maybe two? in each of my escs that seem to be working normally otherwise?

"A power cap should solve the problem because it's the current spikes created by the servo when it changes direction." Been there, done that. No go.

Face it, it's time that Castle takes some heat on this. They could at least be proactive and let people know what is going on. When I people who are newer to the hobby running into this problem and have gone painstakenly out of their way to pinpoint it without luck, it really gets me.

THANK YOU ! You said EXACTLY what I was thinking ! There is obviously SOMETHING not right with these ESC's !

I was running the same setup with 2 other ESC's and neither of them had this problem running 2s ?

Why should we have too buy an external BEC to run 2s when its a supposed to be a 1/10 ESC and MOST 1/10's run on 2s ?

I love Castle's products but after this experience I dont think I could recommend the MMP to anybody who wants to run 2s on it

Well , its still cutting out just a tiny bit when you hit full throttle from a dead stop WITH the external BEC !

Tried going too an ACE 1015 servo also but that didnt help either

Man I was hoping not to have to buy another ESC but I dont like the way the MMP runs the Novak 550 motor

I was going too try a cap with the BEC next but I dont want too spend anymore money trying fixes too get this thing to run correctly

[Arct1k]

If you are running an external BEC and its still dropping out it has NOTHING to do with the ESC.

I'm guessing that your batteries are dumping massively and causing the issue.

Whatever , I am using 5200 Mah 30c batteries that are fairly new and a 8000 Mah 25c battery that is about 3 months old .

These batteries work great in everything I own except the truck with the MMP in it .

The motor and batteries also worked fine with the 2 other ESC's that were in the truck before ?

[Stoomstrijkijze]

Originally Posted by kingdomracer

I guess I should've been more specific. I was thinking instead of using the 7950TH to switch to my 7955TG which isn't HV. In that case would I still need an external BEC on 2s? And is it ok to put say 3 x 4600uf 10v caps in series to be closer (well actually way over) to BrianG recommended 10,000uf 10v? Thanks BrianG for a reply.

It's safe to run the 7955TG on 2S unregulated lipo. It's the same servo as the 7954SH but with titanium gears instead of steel gears.

[Arct1k]

Originally Posted by Stoomstrijkijze

It's safe to run the 7955TG on 2S unregulated lipo. It's the same servo as the 7954SH but with titanium gears instead of steel gears.

No thats a 7950TG.... A 7955TG is a 6V servo...