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Author Topic: Problem with connecting ESC, Battery, Motors  (Read 4515 times)

goBulawayo

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Problem with connecting ESC, Battery, Motors
« on: November 20, 2012, 06:21:28 PM »

Hi Guys, rebuilding a Hooben Perkasa and I have just taken delivery of a 12v gel battery, now I connected it all up and I cannot get anything to work via Tx.

When i connected it all up with a 6v pack, I get a red and green light on the ESC (photo 1) and when I turn on the transmitter the motors turn when stick pushed forward. However when I connect the 12v battery I only get a red light (both flash on connecting the power but then the green goes off) see pic 2 - Pic 3 shows the ESC - When I accidentally connected the battery wires red to black and black to red the motors ran instantly, I assume this is because the  ESC is Fwd only?

Any suggestions please, Thanks

Wayne





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DickyD

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Re: Problem with connecting ESC, Battery, Motors
« Reply #1 on: November 20, 2012, 06:49:05 PM »

Your ESC is an aircraft one and you dont see many planes flying backwards.
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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #2 on: November 20, 2012, 07:28:51 PM »

Yep quite right, problem is I cannot get it to go forwards even!!   >>:-(

Wayne
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Stavros

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Re: Problem with connecting ESC, Battery, Motors
« Reply #3 on: November 20, 2012, 10:52:34 PM »

Going by your own admission of connecting the wires incorrectly ,personslly I think you have cooked it and it is scrap
 
 
Dave
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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #4 on: November 21, 2012, 06:15:08 AM »

Thanks Dave, problem is it still works when connecting the 6v pack?

Wayne
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Netleyned

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Re: Problem with connecting ESC, Battery, Motors
« Reply #5 on: November 21, 2012, 07:39:12 AM »

A new 12V fully charged SLA will be nearer to 15 Volts than 12.
Could the esc be shutting down on overvoltage?


Ned
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essex2visuvesi

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Re: Problem with connecting ESC, Battery, Motors
« Reply #6 on: November 21, 2012, 07:59:57 AM »

A new 12V fully charged SLA will be nearer to 15 Volts than 12.
Could the esc be shutting down on overvoltage?


Ned

Seconded I was going to post the same thing, but you beat me to it
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malcolmfrary

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Re: Problem with connecting ESC, Battery, Motors
« Reply #7 on: November 21, 2012, 12:56:32 PM »

Quote
When I accidentally connected the battery wires red to black and black to red the motors ran instantly, I assume this is because the  ESC is Fwd only?
If its a Fwd only one the motor may have fired up via the protection diode or the intrinsic diode built into the output transistor, and if kept brief, may have saved the ESC, but usually a reverse power connection results in toast.
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Netleyned

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Re: Problem with connecting ESC, Battery, Motors
« Reply #8 on: November 21, 2012, 02:04:46 PM »

f its still working ok on 6v it aint toast  :-))

Ned
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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #9 on: November 21, 2012, 03:31:21 PM »

Thanks Guys, If it is putting out 15V, how do I reduce the voltage? I think my multimeter can check a 12v battery, will have to see (I know nothing about these sort of things) but I am sure it has a selection with a 12 over some solid and dashed lines - My battery is a gel cell type I assume this type could still be putting out 15V as it is new?

Thanks, Wayne
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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #10 on: November 21, 2012, 06:41:27 PM »

Mmm cannot find any setting with 12v on the multimeter, perhaps its not suitable - Photo below, can anyone tell me whether I can check the charge of a 12v battery with this multimeter please

Thanks, Wayne

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Stormbringer

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Re: Problem with connecting ESC, Battery, Motors
« Reply #11 on: November 21, 2012, 06:47:20 PM »




use the 50 v scale
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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #12 on: November 21, 2012, 07:10:13 PM »

use the 50 v scale

White or yellow side? Wayne
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Netleyned

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Re: Problem with connecting ESC, Battery, Motors
« Reply #13 on: November 21, 2012, 07:17:39 PM »

White

Ned
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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #14 on: November 21, 2012, 07:25:18 PM »

Thanks, me thinks my multimeter is shot - It is just swinging all the way across the screen when measuring on 50v and the same on 250v - I opened it up to change the battery and the - wire fell out, looks like it has corroded away. Time for a new one

Wayne
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CF-FZG

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Re: Problem with connecting ESC, Battery, Motors
« Reply #15 on: November 21, 2012, 10:16:48 PM »

A new 12V fully charged SLA will be nearer to 15 Volts than 12.
Could the esc be shutting down on overvoltage?

So does a 10cell Nixx pack and the esc's rated for that.


Question for Wayne - have you set it up according to the destructions??


Mark.
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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #16 on: November 22, 2012, 06:17:51 AM »

Umm destructions, no I didn't have any - this was a freebie ESC - did not realise it would have had them - What might I have needed to do other than connect the wires?

Wayne
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essex2visuvesi

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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #18 on: November 23, 2012, 10:05:30 PM »

Tried the Mtroniks instructions - I have also emailed mtroniks as I am having no joy - I wonder if the receiver is not suitable for 12v as the L-R stick does not operate the rudder servo when connected to 12v, though it works OK on 6v

Wayne
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catengineman

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Re: Problem with connecting ESC, Battery, Motors
« Reply #19 on: November 24, 2012, 12:17:11 AM »

Just a small question
Are you delivering 12 v to the receiver? if so that is why there is nothing going on but does at 6v the Rec will only work with 6v so you will need to have a separate 6v supply to the rec OR get an ESC with a bec (battery elimination circuit)


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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #20 on: November 24, 2012, 07:43:06 AM »

Thanks catengineman, how do I stop the ESC delivering power to the Rx? I have the battery connected to the ESC, teh ESC connected to the motors and the Rx and I have the rudder servo connected to the Rx

Wayne
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catengineman

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Re: Problem with connecting ESC, Battery, Motors
« Reply #21 on: November 24, 2012, 08:53:05 AM »

If you remove the red wire from the plug on your ESC then get a 6v battery pack and plug it into the rec your 12v supply should only go to the motor and the 6v system will drive the ESC and any servos you have in the system


It's worth a try to see if the  ESC you have is shutting down because of some slight fault within


R
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goBulawayo

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Re: Problem with connecting ESC, Battery, Motors
« Reply #22 on: November 24, 2012, 10:21:20 AM »

Thanks R - I will send the ESC off to MTroniks first before cutting any wires

Wayne
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DickyD

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Re: Problem with connecting ESC, Battery, Motors
« Reply #23 on: November 24, 2012, 10:34:18 AM »

Dont cut the red wire, remove it from the plug using a pin and tape it to the cable so you can reconnect it if needed at a later date.
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malcolmfrary

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Re: Problem with connecting ESC, Battery, Motors
« Reply #24 on: November 24, 2012, 11:14:43 AM »

Thanks, me thinks my multimeter is shot - It is just swinging all the way across the screen when measuring on 50v and the same on 250v - I opened it up to change the battery and the - wire fell out, looks like it has corroded away. Time for a new one

Wayne
Yes, its broken.  It looks like the internal circuit that looks after the ranges is no longer a working circuit.
On a working one, you can measure any voltage below what the scale says. 
The dash with dot underline is a universal symbol for DC, so that is what you would use around batteries. The "~" is the symbol for AC. 
Setting for too high a scale will just make the needle give a small travel on a low voltage, moving to a lower scale gives bigger travel and is easier to read.  Making the needle travel too far too fast will kill it.  A needle meter does not need batteries for reading voltage and current.  The batteries are for the resistance scales, which are also very useful for checking whether the meter and leads are fit for use.
If you get a digital one, you get the same ranges, but the results are presented as numbers, thus easier to read.  Usually, they don't care which way round the leads are connected, the display just shows a "-" if its reversed.  The downside is that they need a battery to work at all.
Without a working one, when trying to track electrical faults, you are just guessing and hoping for good luck and magic.
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