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 Post subject: Re: RECALL NOTICE - Tesla NEMA 14-50 Plug used with JESLA
PostPosted: Wed Jul 23, 2014 1:17 am 
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Joined: Wed Oct 30, 2013 3:44 am
Posts: 149
Location: Santa Cruz, CA
So now I'm wondering once again if the UMC can really hold up to daily use at 40A. My understanding is that the replacement 14-50 adapter has a thermal fuse but is it or the connection between the UMC and the adapter any less likely to fail? Can we expect the 14-50 fuse to trigger and need to replace the adapter often?

I saw this over on the teslamotors.com forum:
Quote:
I have a new 14-50 adapter being overnighted to me, since my old one just had the melted lead problem. The SC rep confirmed that the new design does not have a replaceable fuse and does not reset after cooling down. It's completely unusable after it trips and has to be replaced.

Hmmm... since we can't just dial down the charge rate through software with the RAV4, should I/we all switch out our 14-50 outlets for 14-30 and thus cause charging more slowly (24 amps) when using the "Jesla" UMC?

Or maybe buy the ClipperCreek HCS-40P, which can plug into a 14-50 and charges at 30 amps? (And keep the Jesla for portability.)


**********

Tony here (the software is preventing me from posting, sorry):

I'm not aware of a single failure of the new improved plug. Yes, if you want to charge slower, use the 14-30 plug... with a little hacksaw work, you can eliminate or modify the plug's neutral pin and it will plug into a NEMA 14-50R outlet. Neither the car's onboard charger, nor the JESLA need the neutral connection. If you don't understand what I'm referring to, please don't modify ANYTHING.

Don't do this modification on a 14-50 plug, because it will allow it to be plugged into a 30 amp circuit which will OVERLOAD the circuit.


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 Post subject: Re: RECALL NOTICE - Tesla NEMA 14-50 Plug used with JESLA
PostPosted: Wed Jul 23, 2014 5:59 am 
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Joined: Sun Mar 03, 2013 8:18 am
Posts: 208
Location: SoCal
You could replace the plug with a 14-30/50, add a pot between the extra wire and ground to set the current. If I remember right the 14-50 adapter has a 7k ohm resistor to set the 40 amp current, try a 10k ohm pot and see what range you get. I would want a 6-40 amp range.

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 Post subject: Re: RECALL NOTICE - Tesla NEMA 14-50 Plug used with JESLA
PostPosted: Fri Jul 25, 2014 12:36 am 
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Joined: Wed Dec 05, 2012 11:20 am
Posts: 21
Location: Tustin, CA
I dropped by the Costa Mesa Tesla service center last month and swapped the old NEMA 14-50 plug for a new one (with white face), no question asked, except for my VIN number, to which I explained it's for my Tesla friends who stop by to charge ("Oh, OK")....

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 Post subject: Re: RECALL NOTICE - Tesla NEMA 14-50 Plug used with JESLA
PostPosted: Fri Jul 25, 2014 2:53 am 
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Joined: Wed Oct 30, 2013 3:44 am
Posts: 149
Location: Santa Cruz, CA
LastEmp wrote:
I dropped by the Costa Mesa Tesla service center last month and swapped the old NEMA 14-50 plug for a new one (with white face), no question asked, except for my VIN number, to which I explained it's for my Tesla friends who stop by to charge ("Oh, OK")....

Hee hee... my girlfriend tends to do this often too – make up seemingly unnecessary little stories! (Or maybe what I should say is that I have a perhaps naive tendency to tell the unnecessary truth: "Yes officer, I had noticed that I was exceeding the speed limit.")

Anyway, I just went down to the Fremont service center again today to exchange mine. Last time I tried back in March or April, they didn't have them yet. And I was asked a question: "Didn't you receive a new one yet?" To which I answered (openly as usual), "No, I don't have a Tesla. I have a RAV4. And this one has actually melted!" To which he said okay and asked me some further questions to look up the sale in their system. He then went off to find someone or find the part. It actually took him a couple of trips and quite the long while (20+ minutes?) for him to locate one. Perhaps he had to ask several people or go off to some distant factory parts inventory room. (This is the Fremont location.)

Anyway, I've got it now but the surprising and interesting bit I came here to report is the following: I said I was aware the new adapter had a thermal fuse but asked whether anything had been done with the adapter or the Tesla UMC (universal mobile charge cord) to prevent this from happening again. And he said no! No, it's likely to keep happening.

I'm surprised that he was both so forthright and that Tesla hasn't wanted or been able to do anything about their design. I then told him that I was contemplating switching to a 14-30 outlet to force a downgrade in amperage. He suggested that I just dial down the amperage via the car's user controls to which of course I had to explain that Toyota didn't provide that feature in the RAV4. (And yeah, that's a good idea to trim the neutral pin on my 14-30 adapter so I can use it with my existing 14-50 outlet. Had that with my LEAF's charge cord.)

So there you go... be careful with your continued usage of the 14-50 adapter and the UMC.


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 Post subject: Re: RECALL NOTICE - Tesla NEMA 14-50 Plug used with JESLA
PostPosted: Mon Jul 28, 2014 8:23 pm 
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Joined: Wed Oct 30, 2013 3:44 am
Posts: 149
Location: Santa Cruz, CA
TonyWilliams wrote:
Yes, if you want to charge slower, use the 14-30 plug... with a little hacksaw work, you can eliminate or modify the plug's neutral pin and it will plug into a NEMA 14-50R outlet. Neither the car's onboard charger, nor the JESLA need the neutral connection. If you don't understand what I'm referring to, please don't modify ANYTHING.

Just thinking about modifying my 14-30 adapter today...

Tony, don't you use the neutral connection (along with one of the 120V legs) for the little light in the handle of the JESLA? So wouldn't I want to trim the neutral pin (get rid of the L bend) rather than cut it off entirely in order to keep that light working?


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 Post subject: Re: RECALL NOTICE - Tesla NEMA 14-50 Plug used with JESLA
PostPosted: Tue Jul 29, 2014 12:09 pm 
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Joined: Wed Nov 14, 2012 9:50 pm
Posts: 3835
Location: San Diego
Incredulocious wrote:
TonyWilliams wrote:
Yes, if you want to charge slower, use the 14-30 plug... with a little hacksaw work, you can eliminate or modify the plug's neutral pin and it will plug into a NEMA 14-50R outlet. Neither the car's onboard charger, nor the JESLA need the neutral connection. If you don't understand what I'm referring to, please don't modify ANYTHING.

Just thinking about modifying my 14-30 adapter today...

Tony, don't you use the neutral connection (along with one of the 120V legs) for the little light in the handle of the JESLA? So wouldn't I want to trim the neutral pin (get rid of the L bend) rather than cut it off entirely in order to keep that light working?


We don't use neutral at all. The LED light is powered by 3.3 VDC to ground.

You can safely cut off the neutral pin on a 14-30 so that it will fit in a NEMA 14-50 outlet, but please don't do that on a 14-50 plug. It's too easy to plug it in a 14-30 outlet which will overload that circuit.


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