Plugged my 2021 Tab 400 into a 240 plug on accident and blew the converter (maybe?)

adamTabOwner

I did a real dumb and plugged my Tab in a 240 volt 30 amp - that I myself had wired. I know, I know. This is 100% my mistake. I have wired plenty of 30 amp plugs in that past and just wired it up as a 240 out of habit. Consider me suitably admonished and please help me out of this mess. 

First the good news: I was testing the plug and didn't have anything running. The rig was plugged in 30-60 seconds before I noticed the lights on the surge guard (which, if you didn't know, is not a surge protector - I know this now). I unplugged everything and did some googling to see how much trouble I was in, and luckily, all the appliances that I can test on 12 volts seem to be fine.

Now the bad news: I can no longer run on shore power. I don't have a wiring diagram, so I don't know exactly what might have been fried by 240 volts. From what I have been able to figure out, it looks like at least the converter and maybe the main 30 amp breaker. 

We are supposed to leave for the holidays on Tuesday the 20th. We have the solar package, so we can make it work, but I would love to get shore power back before we leave. I am in Seattle and I have Monday to fix this (if possible). Any thoughts?

AnOldUR

WFCO is probably shot, but since most everything you'll need will run on 12V or propane a short term fix may be to connect a smart charger like a NOCO directly to the battery to maintain the charge while on shore power.

Consider installing an EMS while doing your repairs.

pthomas745

You don't tell us what trailer and what year.  You need to open up the converter and check the circuit breakers and check the status there. 

adamTabOwner

@pthomas745 Sorry, it was in the title, 2021 Tab 400. 

adamTabOwner

@AnOldUR that makes sense. Do you have any resources on how to do that? I think I can figure it out, but I let's just say I am feeling a little humble right now.

AnOldUR

@adamTabOwner I don't know of any resources, but they are pretty straight forward to use. Set the charger for your battery type and connect using the alligator clips. Assuming that as @pthomas745 mentioned above you've checked all the fuses and breakers? If you're lucky, it could be a simple fix.

Yoshi_TAB

Hi, As Paul suggested, have you checked the main circuit breaker in your WFCO?    Maybe you got lucky and it just blew/went bad and can be replaced?  Was it tripped or do you noticed any burnt marks behind it?  Here is the website to WFCO.  I would call the tech. support tomorrow and maybe they can help with getting the 12V circuits working.   https://wfcoelectronics.com/ WFCO Electronics - Home    There is also some electrcal diagrams here for a 400. Electrical Resources (vanillacommunity.com)  Maybe they have enough information to help you begin to trouble shoot.  Best wishes..

MuttonChops

First Off, this is not that rare of an event with lots of threads on the topic across several RV Brand Forums.

The wiring error changed the 120VAC Neutral, system ground, to a second 120VAC HOT conductor.

Normal 120VAC

Abnormal 240VAC

Since the Convertor Board in the WFCO Power Center is hard wired 'on' it is toast and its Circuit Breaker might be as well.  Replacement Boards can be purchased . . . just 5-wires to connect.

The Alde, Air Conditioner, and 3-Way Style Fridge - - - if 'off' - - - when the 240VAC was present are most likely Okay.  While the 2-way Fridge is hard wired to 12VDC only.  Except for the Convertor Board and any outlets on its Circuit Breaker I'd expect the AC Panel to be functional.

Note:  Some owners have reported having an Inverter that includes a Shore Power input mode (that way the inverter does not have to 'run' to feed those outlets) . . . so it's possible the Inverter was damaged

adamTabOwner

Thanks everyone! This is all very helpful. The breaker panel is superficially okay. I didn't notice any smell of burning electrical or see any signs of damage. None of the breakers appeared to trip during the event either. The only thing odd about the panel is that the 30 amp rocker has some play when it is in the "on" position (it can be pressed forward more by a millimeter or so). I am not familiar with WFCO breakers, but the 20 and 15 amp breakers have no play in them.

Based on my read of the electrical diagram, I think the only thing that was energized was the 30 amp breaker, the 15 amp breaker for the converter, and the converter itself. Does anyone know if there is a place to get WFCO breakers in Seattle (or nearby)? Then I could test if we can run off shore power. I probably won't be able to charge the battery, but the solar charger is still running, so we can make do.

Yoshi_TAB

Hi,  This is the 8700 series in 320's.  You can download the specific manual for the 400, but they look like standard breakers.  The top list is  for the 30 amp main breaker.    You can get THQL THQP at Lowes or HD.

manyman297

A bit off topic but I’d like to point out how helpful people are on this forum vs. being critical of OP’s error. If this was on any of the Facebook forums you’d get all sorts of nasty comments. I don’t know why that is but it’s why I come to this forum. 

Sharon_is_SAM

Yes, civility is expected and enforced.  Enough said:)

Horigan

Indeed.  The last time I recall this happening, it was an electrician that wired the outlet incorrectly to 240V.
https://tab-rv.vanillacommunity.com/discussion/comment/154789#Comment_154789

Denny16

@adamTabOwner If the main breaker has a space when pushed to on position,,if it has tripped.  Try switching it all the way off then back on.  If you have a meter you can meter the voltage going on and coming out if the breaker to test it.

Yoshi_TAB

Hi @adamTabOwner,

Just curious what ended up being the issue?

Hopefully it was simple and everything is working....