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Mark

Portable Generator fault

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HI all

I used My Wolf generator the other day to power a mig welder to try and spot weld a couple of parts on the Vitesse. I,ve owned the generator for about five years and only used it a couple of times.The car is in a lock- up with no available power. Tested that the generator could power the Mig at home and all worked well. Set up at the lock-up, proceeded to weld and I think the torch stuck to the panel for a split second, and the generator stopped producing power.

Checked the circuit breaker which had not tripped. YouTubed and googled the fault, and tried the regenerating of the windings with a drill trick, suggested but still not producing power, so may have burnt something out inside

Not sure if there is a capacitor or AVR inside, I could only find a small black rectangular box behind the a cover on the end of the generator, looked good, not melted or mishapend, but thought capacitors where cylindrical. 

Called a repair shop who said they don't repair that brand.

Thoughts are now do I scrap it and buy a power inverter off ebay, enough to power a drill or grinder, or take a chance and try and source parts for the generator, by process of illimination.

Any suggestions ideas.

Like the idea of an inverter (quieter for the locals) 

Mark

 

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Cheap electrical goods can be very frustrating!

I have a "Little Devil II" propane heater.   It's predecessor, the same brand, failed (out of warranty, of course!) and the very helpful Machine Mart helpdesk diagnosed a failed thermocouple.  They supplied a new one, but it wasn't the same item, proved difficult to fit and didn't revive the heater.    I've risked a new one, as there's nothing in the same therms/pound range and B/  I have a thumping great propane canister, so an electric one would waste that.     Fingers crossed!

Sorry!  No idea about your generator!

John

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Hello Mark

                   What is the power rating of the generator? and what power rating was you trying to use on the MIG welder?

We have a 3.5Kw inverter on 24volt  1100 amp/hr batteries and my MIG makes the lights flicker a bit and the cooling fans run on the inverter

I think you may be using a much to small a generator(I assume you can pick it up and it runs at 3000 rpm?) perhaps 1Kva?

So only about 5 amps on a good day(that's English amps not Chinse!)

Sad to say but most likely melted the windings!

Roger

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Hi all, thanks for the replies

It's a wolf wp 3500 6.5 hp on wheels from memory max output 3200w (was). Thought i was pushing my luck, but was more concerned about damaging the welder, thinking the circuit breaker on the generator would trip if it was overloaded.

I tried it out and did a few spot welds at home, all seemed ok. I didn't risk running a continuous bead. It's an inverter type Mig, apparently much more efficient than my old Sip, which weighed a ton. 

I think if the welder hadn't stuck i would have got away with it.

On first examination the windings, wiring and connectors all look unscathed and new with no signs of melting,  but I know that doesn't mean much as the damage could be hidden.

Mark

 

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Hi all

After a little research it seemed possible that the Automatic voltage regulator could have blown. I managed to find a new similar one with the same rating 250v 220nu on eBay which arrived today.

The generator now produces power, runs a drill and small compressor as before the fault, but will no longer produce enough power to run the angle grinder it ran peviously. The volt meter on the machine indicates a shade under 220 volts, I can't recall what the power output indicated before the fault.

I may have damaged the windings,  but thought if there was a short  it would produce either 110 volts or nothing as it has outputs for 110 and 240 volts.

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In mine there's also a pretty meaty looking capacitor (similar to that from a fluorescent light).  From experience capacitors are magic and fail in unusual ways.  Might be worth trying to replace that as well, if there is one?

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I did initially look for a capacitor but couldn't find one. I'll have another look. Haven't completely given up on it yet, the AVR was only £4.99 posted. 

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Capacitors do indeed appear to be magic and filled with witchcraft which sometimes leaks away, and unlike the smoke that powers ordinary electrics, witchcraft is invisible so you don’t realise anything is amiss until.......

......... your shower pump randomly won’t start when you go for the final rinse and then having gone dripping down the hall you find the pump is just sat there buzzing and starting to smell a little too warm.....

Off and on at the wall and off it goes again but becomes increasingly unreliable and a fire worry as although it pulls enough current to cremate itself, it’s not enough to blow the 3A fuse or trip the earth leakage device.

Anyway, new cap and all seems good again. Not as cheap as it should have been but much cheaper than a whole new pump!

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12 hours ago, Nick Jones said:

......... your shower pump randomly won’t start when you go for the final rinse and then having gone dripping down the hall you find the pump is just sat there buzzing and starting to smell a little too warm.....

Off and on at the wall and off it goes again but becomes increasingly unreliable and a fire worry as although it pulls enough current to cremate itself, it’s not enough to blow the 3A fuse or trip the earth leakage device.

Ha ha I’m sure we have all done something like this it’s when the ordinary self preservation takes a back seat and you mix a wet body with electrics to rinse the shampoo.  

(They alway wait until you or your significant other has added shampoo)

Edited by Hamish
Sp

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A simple tip if you need a new capacitor.

For most industrial applications where size is not an issue AND if you have no clue as to what size cap to get.  Use the external dimensions of the cap.

Go to RSComps on the website and see what they have in that size range. They often state what it could be used for.

I did this with a Halfords Jet Washer. The cap was cleaned of all identification but RS came up trumps.

 

Roger

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