coffeegeek
Forum Replies Created
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I'll check pressure for all three. The groups have individual temperature sensors, but all three groups show 91.5'C (cold or warm machine). And I've never seen them fluctuate. I always thought it was for show off. But maybe it can be enabled to show real values in the technical menu(?). Also, with another M39 Dosatron (2008) we have, it shows brew time in seconds. On this 2011, it just shows this “fake” 91.5'C all the time.
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Surprise 🙂 I found a small crack in the lid seal. So I'm replacing it and hope that will take care of it
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It's a bench model. You're right. When I put it into the lowest vacuum setting, it manages to finish with only one cycle (like normal).
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It doesn't have any external gas system(?).
And it's been running on the same oil since new. I changed it when the problem appeared, but that didn't change anything. I tried the maintenance button after it happened, but I'm not sure if this is cancelled then powered off, or if it remembers?
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It's 2 years old. I'll check the membrane tonight (I'm not with the machine).
Someone else told me it could be a bad seal, but wouldn't it then just struggle to reach maximum vacuum?
And it definitely wouldn't seal the bag, release pressure and then start over again?
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Sorry, I meant expansion valve. Looks like this:
https://www.cafeparts.com/Expansion-Valve/Product_Manu/14198/Cimbali/415-928-000
Many are set at 12 bars from the factory.
My first thought was to adjust the pump quite high (at least higher than 12 bars). Then choke the group with my manometer portafilter. Then adjust the expansion valve to approx. 10.5 bars (I heard this is good). Then lower the pump back to 9.5-10 bars (optimal brew pressure is 9 bars).
Or am I doing it wrong?
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0.2 amps. (50W, I = P/U = 50w/250v = 0.2A).
0.4kW is 15% over the 0.35kW motor. Not sure why they would do that. The VFD menus have own settings for ACC and DEC (acceleration and deceleration).
I'm not with the motor and the oven is assembled again. I'll take a look next time 🙂
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I don't know why I didn't think of it in the first place.
I see the original VFD was set to 0.40kW, but the motor is 0.35kW (on both ovens). Was it programmed wrong, or did they do it on purpose?
Any insights on this?
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The trick was; go through the VFD of an identical oven and replicate the parameters on the off-the-shelf VFD 🙂
And for those of you who work on a lot of ovens weekly, I would go through the VFD parameters of every oven model, and compile a parameters library. Then, when a VFD breaks, just buy it from Farnell, Mouser, etc. and look up your parameter library 🙂
https://octopart.com/search?q=ATV12H075M2¤cy=USD&specs=0Maybe not in the spirit of the leeches, but it would save you a bundle… 🙂
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Oven is cooking again! 🙂 I made sure to buy an exact replacement (identical part number ATV12H075M2). I went through all the parameters, and finally it communicated. The replacement was about $170 while Convotherm was about $2k here. No reason to bleed an already ultra low margin industry (restaurants).