Re: Cherry Pi III Is Available July 17, 2015 11:55AM |
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Re: Cherry Pi III Is Available July 17, 2015 05:23PM |
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gowen
It's an X-Box One power supply that Andy supplied with my kit. The label quotes 12VDC @ 17.9A which by my maths is 215 W.
Re: Cherry Pi III Is Available July 17, 2015 06:28PM |
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Re: Cherry Pi III Is Available July 18, 2015 03:18AM |
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Re: Cherry Pi III Is Available July 18, 2015 05:09AM |
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dc42
gowen, how large is the print bed, and what bed heater are you using? What voltage are you getting on the bed terminals when the bed heater is on?
Re: Cherry Pi III Is Available July 18, 2015 08:17AM |
Registered: 10 years ago Posts: 14,672 |
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gowen
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dc42
gowen, how large is the print bed, and what bed heater are you using? What voltage are you getting on the bed terminals when the bed heater is on?
The bed is about 200mm, aluminium with a built-in heater. I haven't checked the voltage across the terminals. I'll do that on Monday.
I'm trying to get all the parts ready to swap the ramps over to a Duet.
Re: Cherry Pi III Is Available July 20, 2015 08:50AM |
Registered: 9 years ago Posts: 68 |
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dc42
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gowen
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dc42
gowen, how large is the print bed, and what bed heater are you using? What voltage are you getting on the bed terminals when the bed heater is on?
The bed is about 200mm, aluminium with a built-in heater. I haven't checked the voltage across the terminals. I'll do that on Monday.
I'm trying to get all the parts ready to swap the ramps over to a Duet.
Also measure the resistance between the bed terminals if you can. There was a thread recently in which it turned out that a whole batch of PCB heaters had too high a resistance. Possibly the manufacturer used 1oz copper instead of 2oz, or something like that.
Re: Cherry Pi III Is Available July 20, 2015 10:14AM |
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Re: Cherry Pi III Is Available July 20, 2015 11:07AM |
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Re: Cherry Pi III Is Available July 20, 2015 11:33AM |
Registered: 9 years ago Posts: 68 |
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Dejay
If you want to measure low resistance more precisely you could temporary put a 1 ohm resistor in series to the bed and measure the voltage instead. You'd have to look up the formula though. Or ask the seller about the precise resistance.
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Dejay
If you can you could get a 24 V power supply instead of 12 V. If your electronics works with that. But then you might need 24V fans and stuff.
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Dejay
Maybe you need to configure the resistance of your heat bed in your firmware? If it assumes it's a smaller bed with a lower resistance then it could be too timid on the heating. But I would think the firmware would calibrate that itself.
Re: Cherry Pi III Is Available July 21, 2015 10:56AM |
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Re: Cherry Pi III Is Available July 21, 2015 11:00AM |
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Re: Cherry Pi III Is Available July 21, 2015 11:31AM |
Registered: 9 years ago Posts: 1,159 |
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gowen
With the better multimeter the current heater has a resistance of 2.5 Ohm which equates to 57.6 Watts or 1.5 kW/m². Considering the Think3dprint3d.com kapton heater can do 6 kW/m², I suspect the heating element is the problem. Can anyone recommend a source for a higher power rated 220mm bed?
Re: Cherry Pi III Is Available July 21, 2015 04:26PM |
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Re: Cherry Pi III Is Available July 21, 2015 04:26PM |
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dougal1957
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gowen
With the better multimeter the current heater has a resistance of 2.5 Ohm which equates to 57.6 Watts or 1.5 kW/m². Considering the Think3dprint3d.com kapton heater can do 6 kW/m², I suspect the heating element is the problem. Can anyone recommend a source for a higher power rated 220mm bed?
How about Silicon heater this is a mains powered 200 mm dia one drive it with a ac-ac SSR and stick it under your existing Aluminium bed or get a thicker piece of Alloy for it ( I use a piece of EcoCast 6mm thick tool plate which is machined flat on both sides stuck a 300 mm dia pad on it and it heats to around 130 in about 5 mins put a piece of thickish cork under it and it is even quicker (Still got to do that to mine but I have it ready to go.
hth Doug
Re: Cherry Pi III Is Available July 21, 2015 06:04PM |
Registered: 10 years ago Posts: 903 |
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gowen
With the better multimeter the current heater has a resistance of 2.5 Ohm which equates to 57.6 Watts or 1.5 kW/m². Considering the Think3dprint3d.com kapton heater can do 6 kW/m², I suspect the heating element is the problem. Can anyone recommend a source for a higher power rated 220mm bed?
Re: Cherry Pi III Is Available July 22, 2015 02:48AM |
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Re: Cherry Pi III Is Available July 22, 2015 03:41AM |
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Re: Cherry Pi III Is Available July 22, 2015 04:17AM |
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Re: Cherry Pi III Is Available July 22, 2015 04:30AM |
Registered: 9 years ago Posts: 1,159 |
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gowen
Thanks for all your input guys. It looks like a silicone mat heater is the way to go.
Just a thought. Does anyone know of a source of flat circular steel plate? On the 3D Today podcast they use a heated steel bed with removable glass on top. The steel provides enough mass to trigger the inductive leveling probe at its full 4mm range. so above the glass.
Re: Cherry Pi III Is Available July 22, 2015 05:45AM |
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Re: Cherry Pi III Is Available July 24, 2015 06:33PM |
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Re: Cherry Pi III Is Available July 25, 2015 11:44PM |
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Re: Cherry Pi III Is Available July 26, 2015 09:40AM |
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Re: Cherry Pi III Is Available July 27, 2015 04:30PM |
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Re: Cherry Pi III Is Available July 29, 2015 07:40AM |
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Re: Cherry Pi III Is Available July 29, 2015 07:24PM |
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Re: Cherry Pi III Is Available August 01, 2015 09:22AM |
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Re: Cherry Pi III Is Available August 04, 2015 04:08PM |
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Re: Cherry Pi III Is Available August 04, 2015 04:58PM |
Registered: 10 years ago Posts: 14,672 |
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YDKJ
Hello all,
I started building a Cherry Pi IIIs a while ago and at the moment I'm busy wiring up.
So far it is going well but there are two things I'm concerned about.
1. Inductive sensor output voltage
I made a simple voltage divider using two 15kOhm resistors for my Sensor according to this Video. The measured output voltage is 6,1 V. This seems a little high to me. Can I still use it to connect it to my Duet board? Or will the board take damage?
2. Sensor wiring
All the wiring diagrams or descriptions I found are referring to another typ of sensor (e.g. here). What is the right way to connect my sensor to the Duet?
Maybe like this?
Sensor - Board
12V in (Brown) - 12V PSU
Output (Black) - TXD1 Pin on the expansion header
GND (Blue) - GND PSU
Thank you in advance.
BR
Simon