RC India
Welcome Guest, please login or register.
 
Pages: 1 [2]  All   Go Down
0 Members and 1 Guest are viewing this topic. Topic Tools Topic Tools 
Read
« Reply #25 on: January 22, 2019, 11:37:26 AM »
chintal
Heli Lover
Forum Hero
*****

Reputation Power: 4 
chintal has no influence.
Offline Offline

City: mumbai
State: Maharashtra
RC Skills: Advanced
Posts: 1498
Join Date: Dec, 2013



I suspect the speed controllers are fake, I have asked Emax to look into the matter , can you post a link to the aliexpress page from where you have bought them ( the one above does not work ).
Emax esc's are pretty good I have never had one fail on me.
When buying stuff from Chinese websites please check reviews written by real customers.
Logged

Rcmumbai.com
Passion is Airborne
 

Read
« Reply #26 on: January 22, 2019, 11:51:57 AM »
chintal
Heli Lover
Forum Hero
*****

Reputation Power: 4 
chintal has no influence.
Offline Offline

City: mumbai
State: Maharashtra
RC Skills: Advanced
Posts: 1498
Join Date: Dec, 2013



As per Emax these ESC's are fake 

Screen Shot 2019-01-22 at 11.48.07 AM.jpg
Re: ESC burn up with 14.8V 4500mah 45C lipo - Quadcopter
* Screen Shot 2019-01-22 at 11.48.07 AM.jpg (75.94 KB, 800x707 - viewed 58 times.)
Logged

Rcmumbai.com
Passion is Airborne
 

Read
« Reply #27 on: January 22, 2019, 03:35:32 PM »
pnkyjs
Plane Lover
Senior Member
***

Reputation Power: 3 
pnkyjs has no influence.
Offline Offline

City: Satara
State: Maharashtra
RC Skills: Intermediate
Posts: 230
Join Date: Apr, 2010



seeing the images, i wonder how you have terminated the working end of the ESC , since they are not connected to any motor, still they appear bunched together. If they short in anyway , this could be an issue, since they output alternating current , simple insulators would fail easily.
Logged

V911
V977
XFX 450 V2
Scratchbuild foamies galore
 

Read
« Reply #28 on: January 22, 2019, 10:56:51 PM »
tmvnarunkumar94@gmail.com
Plane Lover
Active Member
**

Reputation Power: 1 
tmvnarunkumar94@gmail.com has no influence.
Offline Offline

City: Chennai
State: Tamil Nadu
RC Skills: Beginner
Posts: 15
Join Date: Jun, 2018



Thanks for the information Chintal. Actually the purchase link that I posted earlier has expired entirely and aliexpress have posted with some other product in that link.

I checked all the ESCs, each FETs has different codes printed over it, not all 6 FETs are similar for 4 ESCs. Will it be same for original ESCs (This information will be helpful for my next purchase on ESC)
Logged
 

Read
« Reply #29 on: January 22, 2019, 11:00:43 PM »
tmvnarunkumar94@gmail.com
Plane Lover
Active Member
**

Reputation Power: 1 
tmvnarunkumar94@gmail.com has no influence.
Offline Offline

City: Chennai
State: Tamil Nadu
RC Skills: Beginner
Posts: 15
Join Date: Jun, 2018



I agree with you Mr. pnkyjs. Only 2 out of 4 ESCs were soldered with 3pin Xt60 connector. Even the open working end ESCs got burnt.
Logged
 

Read
« Reply #30 on: January 22, 2019, 11:05:49 PM »
tmvnarunkumar94@gmail.com
Plane Lover
Active Member
**

Reputation Power: 1 
tmvnarunkumar94@gmail.com has no influence.
Offline Offline

City: Chennai
State: Tamil Nadu
RC Skills: Beginner
Posts: 15
Join Date: Jun, 2018



Hi Kiran,

I checked for continuity at the output terminals (A B C) . . . I could see short-circuit at terminals A-B in all ESCs and A-B-C in 2 ESCs. Will this happen when the ESCs are fake/ unreliable ?? Or this is due to the burnt FETs Huh?
Logged
 

Read
« Reply #31 on: January 22, 2019, 11:41:54 PM »
kiran rc
Plane Lover
Forum Hero

*****

Reputation Power: 20 
kiran rc barely matters.kiran rc barely matters.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Intermediate
Posts: 1220
Join Date: Feb, 2013

Live your dream and wear your passion



Hi Kiran,

I checked for continuity at the output terminals (A B C) . . . I could see short-circuit at terminals A-B in all ESCs and A-B-C in 2 ESCs. Will this happen when the ESCs are fake/ unreliable ?? Or this is due to the burnt FETs Huh?

Two possibilities...
1) The A,  B lines/traces on the PCB may be shorted on all the ESC's.
2) Burnt FET's. It's possible that not all the MOSFETs are burnt on the 2 of them,  hence showing contuinity for just A,  B.

The former possibility can only be eliminated by testing new ESC. It maybe a manufacturing defeat(usually happens with counterfeit products)
Logged
 

Read
« Reply #32 on: January 23, 2019, 10:07:43 PM »
tmvnarunkumar94@gmail.com
Plane Lover
Active Member
**

Reputation Power: 1 
tmvnarunkumar94@gmail.com has no influence.
Offline Offline

City: Chennai
State: Tamil Nadu
RC Skills: Beginner
Posts: 15
Join Date: Jun, 2018



Thanks All !!!

I come to a conclusion that the ESCs were counterfeit. Though it's a loss of money and time, I would like to make a wise move then.

I am using EMAX MT3110 - 700kV motors and 14.8V - 4500mAh - 45C Lipo for my application. The maximum current being 17.6A at max throttle for 12x3.8 prop. The thump rule for ESC selection that i followed was 1.5 x 17.6 = 26.4A.

I am about to purchase 5 sets of ESC.

1. Which will be a suitable 25A or 30A ESC ?
2. Which firmware shall I go for (Blheli or Simonk) ?
3. Which brand to go with and where can I get a reliable one ?

Motor spec.jpg
Re: ESC burn up with 14.8V 4500mah 45C lipo - Quadcopter
* Motor spec.jpg (65.42 KB, 587x600 - viewed 30 times.)
Logged
 

Pages: 1 [2]  All   Go Up
Jump to: