1 Topic by alexcheve (edited by alexcheve 2013-09-02 03:48:21)

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Topic: Best place for temperature sensor

I drilled a hole at one side of the extruder and inserted the little ball tip of temperature sensor cable there. I did set control to 180C and did auto setup. It was blinking as it is told and used a IR reader to check temp in extruder. It got up to 191C and I decided to turn it off as control still blinked.
I think I am not placing the sensor where it is supposed to be. I have not find an explanation for that so I decided to ask for help here. Hope someone gives solution. Thanks.

2 Reply by elmoret

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Re: Best place for temperature sensor

Can you upload a picture of where you put it?

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3 Reply by alexcheve (edited by alexcheve 2013-09-02 03:54:31)

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Re: Best place for temperature sensor

Made 3 pics, one shows terminal inserted in brass, the other two show hole and ball tip outside of hole.
Made vertical setup as I want to make a winder mechanism.

flickr . com/photos/alexecheverria/9652241206/

flickr . com/photos/alexecheverria/9652241144/

flickr . com/photos/alexecheverria/9652241146/

4 Reply by elmoret

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Re: Best place for temperature sensor

That probe is in the right place, though it should be covered in Kapton.

What's the problem you're concerned with? Some overshoot is normal if the controller hasn't been autotuned.

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5 Reply by alexcheve

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Re: Best place for temperature sensor

I did set it to autotune as you explained to another kit supporter who asked similar question about how to get temp to go higher. You told him how to set the control and I followed your instructions, no problem with that. What I see in mine is that blinking does not stop even if temp in nozzle goes up to 191 Celsius, which is a lot and my readings are close to where the sensor is placed, inside the nozzle side.
Will try again with some kapton tape and tell you how it went. Thanks for replying.

6 Reply by elmoret

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Re: Best place for temperature sensor

191C is no problem. What do you mean by blinking? Which controller do you have?

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7 Reply by alexcheve (edited by alexcheve 2013-09-02 04:42:05)

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Re: Best place for temperature sensor

It is a Sestos. I just placed a short video showing the blinking. I will wait to see if it stops and how long it takes to reach 180 Celcius.

youtu.be/4C9ko3p1eS8

This post is where I found instructions to set automatic control: "How to use the PID Temperature Controller"

8 Reply by alexcheve (edited by alexcheve 2013-09-02 05:41:18)

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Re: Best place for temperature sensor

After half an hour it reached 221 Celsius and "180 autosetup" still is blinking. I have to turn it off as I am afraid my ABS funnel will melt in the tube as it is reaching 120 Celsius in the opening!
I have not placed pellets yet.
Can it be that the temperature sensor is not working?
I placed positive terminal at pin 4 and negative at pin 3 of Sestos.
As there is no clear explanation of where it has to be located I followed intuition when I saw what seems a lateral hole to be drilled in nozzle drawing: "Figure 2. Section view of nozzle", and picture: "Figure 3. Filament guide info" has a metal "ziptie" holding the sensor at the side of nozzle with no apparent hole, just holding close to metal, maybe another option.
I cannot control temperature like this.

Filastruder is #363, by the way.

9 Reply by Ralphxyz

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Re: Best place for temperature sensor

alexcheve, how accurate is your IR reader? Cheap ones are notorious for in accuracy!!

Ralph

10 Reply by alexcheve

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Re: Best place for temperature sensor

Hello Ralph, it is a cheap IR that reads up to 380 Celsius. It does read same temp that Pronterface displays in hot plate of my Printrbot so I can say it is accurate.

11 Reply by IanJohnson

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Re: Best place for temperature sensor

It depends on how reflective the thing is that you are reading.  To be more certain, you can try putting a piece of masking tape on the front of the nozzle and then read that so you don't have to worry about the reflectivity of the brass.

12 Reply by elmoret

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Re: Best place for temperature sensor

alexcheve wrote:

After half an hour it reached 221 Celsius and "180 autosetup" still is blinking. I have to turn it off as I am afraid my ABS funnel will melt in the tube as it is reaching 120 Celsius in the opening!
I have not placed pellets yet.
Can it be that the temperature sensor is not working?
I placed positive terminal at pin 4 and negative at pin 3 of Sestos.
As there is no clear explanation of where it has to be located I followed intuition when I saw what seems a lateral hole to be drilled in nozzle drawing: "Figure 2. Section view of nozzle", and picture: "Figure 3. Filament guide info" has a metal "ziptie" holding the sensor at the side of nozzle with no apparent hole, just holding close to metal, maybe another option.
I cannot control temperature like this.

Filastruder is #363, by the way.

It sounds like the temperature sensor is fine, but perhaps your wiring is incorrect or a setting inside the PID controller is wrong. By default it should work out of the box in terms of settings. The last possibility is that the relay terminals are stuck, though that would be exceedingly rare.

Are you sure the heater is connected to pins 7 and 10? You have a jumper between pins 8 and 9, correct?

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13 Reply by alexcheve

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Re: Best place for temperature sensor

Hello, here is the photo showing wiring setup in Sestos back. The wires are in the correct number.

flickr . com/photos/alexecheverria/9658835941/

Can you please tell me what is the meaning of the red "PV" numbers?
How can I make Sestos display the actual temperature reading from the sensor?

14 Reply by elmoret

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Re: Best place for temperature sensor

Alex,

I replied to your email, and got an auto-response from a spam bot. Here was my reply:

PV is process value - this is the current measured temperature.
That answers your second question.
I don't understand your third question.

I think the reason no one has replied to your thread is it is somewhat difficult to interpret your english. Could you possibly make a video of what is going on? I will try to help, it is just hard to understand some of your communications. What is your native language?

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E3Dv6 All Metal Hotend - the premier 3D printing hotend