Heated bed 2500 Watt + Duet3 6hc
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@Phaedrux the diagramm is very good!!
the only thing I´m confused about is the power switch beetween RSU and the electronic. Is it also possible to have the power switch between socket and RSU?
Where Do I have to connect the cable in the Duet3? At the 15a high current in and output?
thanks -
https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Wiring_Diagram
Yes Out0 would be the normal candidate for the bed heater due to it's 15a capacity, but since you're using an SSR you could use any of the output pins to drive it.
https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview#Section_Heating_Fans
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@Phaedrux RSU has 27a and the SSR40a. Is this a problem?'
Or must be the current of the SSR less than the RSU..?
thanks -
The SSR rating is just for it's max capacity, not what it draws or anything like that.
What are the specs of your heater?
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@Phaedrux 85x85cm silicon heater
2500watt -
What is your regional ac voltage? 110 or 220?
110 would be ~22a current
220 would be ~11a -
@barbarossa-cologne
I think you mean PSU,
The PSU has a rating for the amount of power it can supply. The SSR is just a switch, but its rating is like a wire, how much current it can carry.
The PSU and SSR are doing separate things, they just happen to use the same measurements (Amps).
Your bed heater will draw ~11 amps (I'm assuming you are in Europe based on your username) with the 220V from the wall, the SSR can carry a lot more (which is good, because the rating on SSR's is often over optimistic) (@Phaedrux I think got those numbers reversed).
The PSU can supply 27 amps, but that is at the 24 volts its putting out, its not being used to power the heater.
One thing to keep in mind, if you do something crazy, like max out the PSU by using it to drive an extra heater or a heated chamber... The combined power requirement would be over 3000 watts.
That would be more than is safe on a normal European wall plug (they are normally 13A max).Isolate, substitute, verify.
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@theruttmeister
yes, of course PSU. sry
Rigth. I´m in cologne. So it´s 220v.
So when I understand it rigth, I should buy a second power supply with more volts for connecting the SSR and the heater?thanks for the explanation
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@theruttmeister said in Heated bed 2500 Watt + Duet3 6hc:
@Phaedrux I think got those numbers reversed).
Yup I did, sorry.
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@barbarossa-cologne said in Heated bed 2500 Watt + Duet3 6hc:
@theruttmeister
yes, of course PSU. sry
Rigth. I´m in cologne. So it´s 220v.
So when I understand it rigth, I should buy a second power supply with more volts for connecting the SSR and the heater?Is it a 220V AC bed heater? If it is, then you don't need a PSU for it. If it isn't, then you have the wrong SSR and we need to know what voltage it is.
Tom Sanladerer posted a video on using SSRs to control AC mains bed heaters here https://www.youtube.com/watch?v=TiEwNf1H_Tc.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
This post is deleted! -
correct?
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@barbarossa-cologne
An SSR is just a switch. The control side only needs to be 24V (actually anything from 3-48V is common, the SSR will be marked), the PSU is powering just the switching of the SSR, which uses a very small amount of power.
The whole point of using an SSR is that the other side of the switch can be for much higher voltages and can carry lots of current.So your wall socket can supply up to 13A, your SSR can carry 25A and the bed only draws 11A. Everything is good.
The PSU is not powering the bed in any way at all. Its just controlling the switch.
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@dc42
It's a 220v heater.
Thanks for the video link.
I think @theruttmeister
thanks a lot
It's working but heating up needs a lot of time. How can I change this?
23 to 60 degree needs 10 or more minutes
Thanks -
@barbarossa-cologne
If you haven't already, insulate the back of the heater. That can make a huge difference.
All the other options are lots more difficult: More powerful heater (needs a non-standard wall socket, unless you have a 16A or 32A Ceeform?), smaller bed (that 85x85cm is huge). Thinner bed... which given the size might well warp.
Best bet is insulation, if you don't have any right now, half the heater output is heating the air.
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Do you have the means to measure voltage and current ?
The time required for heatup doesn't make sense if everything is hooked up correctly. -
@barbarossa-cologne said in Heated bed 2500 Watt + Duet3 6hc:
It's working but heating up needs a lot of time. How can I change this?
23 to 60 degree needs 10 or more minutesHave you PID tuned the heaters and saved the results?
https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control -
@Phaedrux
I started 3D print 3 months ago. So I´m sorry when I don´t understand some code etc.
Is this picture helpful?
thanks for all
I have to say that this morning it was heating up a bit faster. I disconnected other things from the socket. But it is still slow.... SSR isn´t warm.
the house is about 70 years old... maybe it is not enough power on the socket?? -
Ahhhhh .... the guilty party is the PWM setting. You have set the heat pad to effectively be 250W!
Calibration voltage 0.0V ??? -
@jens55
Ok. Do you mean 2500 watt?
How can I change this parameters ?
