Hobbywing 70A-HV

[JayCee]

After a bit of help and advice please.

 

Just started to assemble my Chrisie Pressie Hangar 9 Pulse 125 which is going to be Electric Flight.

 

 

 

 

 

The model requires  to four cell 5000 mah batteries in series. I have purchased a Hobbywing 70A-HV ESC it clearly states NO BEC However there is a red lead

connected to the throttle output (BEC?)

 

There is nothing in the instructions regarding removing the Red + lead so that I can install a UBEC

 

Also there is a thin BLACK - wire, again the instructions give a complicated connection sequence to avoid a 'Spark' when the battery is connected. However as I am using two batteries in series using 'Deans' connectors it's not possible to follow their instructions:-

 

Connect main RED + first, then THIN BLACK - then within 3 seconds Main BLACK -  Just not possible using 'Deans'

 

I don't want to use 'Bullet' type connectors as there is to much room for error when connecting the batteries in series. 

 

JC

 

 

 

[Richard Wood]

Hi Jaycee,

Probably the neatest way of connecting the thin black wire is to

plug it into the negative connector on the negative battery's balance

connector.(The current  through this wire will be low).

 

You must make sure that you connect this wire to the negative

of the two batteries to avoid a short circuit across this battery when

the main black lead is connected.

 

You'll also need to make a break in the negative arm of your main wiring

harness with another Deans plug & socket connection on the main black wire.

This connector will therefore be the last connection made when all is

connected up.

You could of course have two Deans connectors wired in here - one for

the thin black wire & one for the main black wire & do away with the

connection to the balance connector.

 

The red wire in the Rx plug may well have no connection & perform no function,

and is just left intact from the standard lead during manufacture.

To be safe just remove the red wire from the plug to use a UBEC.

 

I hope this makes a bit of sense - let me know how you get on as

I'll be using this sort of arrangement in a future model.

 

Another good source of info is the Giantcod forum.

 

 

Cheers

Richard

 

 

 

[Richard Wood]

You must make sure that you connect this wire to the negative

of the two batteries 

 

This sounds a bit confusing after reading it back.

Connect the thin black wire to the negative lead in the balance connector

on the first series battery.

 

 

[JayCee]

Thanks Richard, thought nobody loved me

 

In the end I did this:-

Made a series connector lead with Deans plugs for the battery(s) but terminating in 4mm bullet connectors to connect to the ESC. I have managed to incorporate the small black - with a 2mm bullet connector and the same on the ESC so that I can connect as per Hobbywings instruction manual.

 

I wanted to use Deans for the batteries to try and keep everything universal.

 

Was quite pleased with myself until I realised I had forgotten to incorporate the UBEC supply in with the + & - on the ESC.... and it looked so neat

 

I managed to contact Hobbywing in China regarding the red wire in the throttle plug and got the reply 'The Red Lead is useless'  which I assume is a literal translation meaning it's not connected to anything!

 

JC

 

 

[Richard Wood]

Neatly done job JC.

Hobbywing's spark killer is a good idea.

 

Good luck with the Pulse 125.

 

 

[Frank Skilbeck]

Posted by JayCee on 29/12/2010 23:34:37:

 

I managed to contact Hobbywing in China regarding the red wire in the throttle plug and got the reply 'The Red Lead is useless'  which I assume is a literal translation meaning it's not connected to anything!

 

 

 Well maybe not, if an ESC has a BEC it uses this to supply the voltage to the microprocessor on the ESC, it will still do this if you disconnect the red wire providing the ESC has a BEC, if it doesn't have a BEC the power for the microprocessor will be from the reciever power supply.