Ultimaker Original shut off during preheat

[tomvld 0]

Hi,

When I want to preheat my Ultimaker Original the complete system shuts off. The display turns off and I have to wait a couple of minutes before I can turn it on again.

Does anyone have an idea why this happens?

Thanks in advance!

Tom

[the_schire 3]

Sounds to me like the power supply is going into over current protection. Are you using a different power supply or did you add anything that will draw extra power?

[tomvld 0]

Thanks for your response.

No, everything is original and i didn't add anything. I also think it is going into some kind of protection. Today I also tried to manually heat the printer but that also doesn't help.

Do you have any suggestions regarding the over current protection?

Thanks in advance.

[Dim3nsioneer 558]

Can you please give us some more details about your printer? You refer to preheating which is usually used for a heated bed. Do you have an UMO with the heated bed upgrade kit or an UMO+?

[tomvld 0]

I have a UMO, without heated bed. With the preheating I'm referring to the option preheat PLA/ABS.

Basically to warm up the printer. As I mentioned in my previous post it also happens during manually warming up so to me it seems like sort of a protection which the_shire suggested.

[amedee 349]

If it is an UMO then it is an 'old' printer -- I not saying this in a negative way, just a deduction that it is not a newly assembled printer, and that it should have worked in that past...

So what did you changed recently?

At first I am thinking of 2 problems:

- Power supply as already mentioned

- A short in the heater cartridge (or the cabling to it), so when you start heating it shorts the power supply and everything goes dark.

I would disconnect the heater cartridge and measure the resistance to check for a short; also try to pre-heat with the cartridge disconnected: nothing should happen (except for a temp error after a while), but that would exclude a short on the board itself.

[tomvld 0]

Yes, it is definitely an 'old' printer and it has worked fine for me the last couple of years without any major problem. But after finishing a print I wanted to preheat for another print and suddenly the printer shuts off. I didn't do to, or modify anything on the printer.

Personally I don't think it's a power supply issue since the printer can be switched on, the problem occurs when I want to increase the temperature.

This afternoon I will measure the resistance in the heater cartridge, do you have any expierence with that? Can you suggest me some cables/connectors that I should measure?

Thanks for your suggestion!

[amedee 349]

Personally I don't think it's a power supply issue since the printer can be switched on, the problem occurs when I want to increase the temperature.

I don't think either, but it could be that the PSU is still able to provide enough current for the board (it does not need a lot), but gives up when you really draw power...

This afternoon I will measure the resistance in the heater cartridge, do you have any expierence with that? Can you suggest me some cables/connectors that I should measure?

Disconnect the 2 wires from the 'Extruder 1' connector on the top of the board and measure the resistance. I can't remember what it should be (I can check when at home) but if it is a short then it is definitely wrong.

[tomvld 0]

I don't think either, but it could be that the PSU is still able to provide enough current for the board (it does not need a lot), but gives up when you really draw power...

I didn't think about that indeed.

Thanks for your help, I will keep you updated!

[tomvld 0]

I measured the resistance of the heater cartridge (the two wite insulated wires) and it is 0.03 ohm.

When I disconnected the heater cartridge and wanted to preheat the printer the temperature setting went up and nothing happened as expected indeed.

I hope this helps.

Edited July 25, 2017 by Guest

[amedee 349]

I measured the resistance of the heater cartridge (the two wite insulated wires) and it is 0.03 ohm.

 

This is way too less, it is just like a short...

I measured mine and I have a bit more than 10 Ohms, which correspond approximately to a 35W cartridge

.

Looks like you need a new heating cartridge (or there is a short somewhere in the cable)

[tomvld 0]

Oke, that sounds plausible! thank you very much for your time and effort!

If I'm correct the heater cartridge is 18V right?

I will order a new heater cartridge and see if it will work again.

I will let you now if it works!

Edited July 26, 2017 by Guest

[amedee 349]

If I'm correct the heater cartridge is 18V right?

UMO power supply is 19V