Jump to content
Ultimaker Community of 3D Printing Experts

Heated Bed Errors - Screw Terminal? pt100?


Recommended Posts

Posted (edited) · Heated Bed Errors - Screw Terminal? pt100?

Hello Ultimaker community,

It's been a while since I've had to post any hardware issues, but my heated bed has started acting up recently. Either the pt100 returns a temperature of 55 degrees (even at room temp.) and thus stops heating the bed, causing it to cool down (and prints just pop right off), or I get the MAXTEMP BED error.

I've gone through to check the connections multiple times, and I do not see any issue. However, one thing did catch my eye, and it threw me off a bit:

5a333c2b4997a_Inkedscrewterminals_LI.thumb.jpg.8a2c7ff0b483777abcbc84f5f9c029d2.jpg

As you can see, the third screw terminal is missing the copper plate (or whatever it is) at the back (all of the terminals are wide open). It is one of the terminals for the heater itself, not the pt100. Should I be concerned?

Additionally, I measured the resistance on the pt100 at room temp, and it started off pretty consistent at around 111 ohms, but as soon as my hand would twitch a bit, it would hike up to the 120's, 130's, 140's, sometimes even the 200's, then drop back down in a matter of seconds. When I turned the machine on, though, the temperature seemed pretty steady. Is this normal? Should I attempt resoldering the connections (I'm already out of warranty)?

Thank you,

nerdwarrior

5a333c2b4997a_Inkedscrewterminals_LI.thumb.jpg.8a2c7ff0b483777abcbc84f5f9c029d2.jpg

Edited by Guest
  • Link to post
    Share on other sites
    Posted · Heated Bed Errors - Screw Terminal? pt100?

    Add-on: My bed was consistently reading around 6 degrees higher than the hotend at room temp, which I never really paid attention to, but after properly redoing all connections, they are back at the same temperature. However, I'm still concerned about both the fluctuating resistance and the terminal.

  • Link to post
    Share on other sites
    Posted · Heated Bed Errors - Screw Terminal? pt100?

    Hi nerdwarrior,

    You should change this Terminal Block.

    Here is a picture I made from the terminal block to see the connector lip in half way closed position.

     

    Terminal_MKDS1_SMD.thumb.jpg.2e1af8ea2fe2e265855c8ee61a8fd342.jpg

    The material in here is Tin plated Copper. Maybe we can see this lip if you turn the screw clockwise to lift the lip. Did the wires for the heat bed show any sign of overheated, burnt black etc.?

    If you touch (trying to heat) the PT100 resistor with your finger, there should not be any big jump in the reading - maybe 1 ohm "more", this cause the aluminium plate is connected to the resistor.

    Here is the P/N number of the used Terminal Block:

    MKDS 1/ 4-3,81 SMD

    And here is where you find them:

    http://www.tme.eu/gb/details/mkds1_4-3.81smd/pcb-terminal-blocks/phoenix-contact/mkds-1-4-381-smd-bk-1727256/

    OK., good luck.

    Thanks

    Torgeir.

  • Link to post
    Share on other sites
    Posted · Heated Bed Errors - Screw Terminal? pt100?

    Hi nerdwarrior,

    You should change this Terminal Block.

    Here is a picture I made from the terminal block to see the connector lip in half way closed position.

     

    Terminal_MKDS1_SMD.thumb.jpg.2e1af8ea2fe2e265855c8ee61a8fd342.jpg

    The material in here is Tin plated Copper. Maybe we can see this lip if you turn the screw clockwise to lift the lip. Did the wires for the heat bed show any sign of overheated, burnt black etc.?

    If you touch (trying to heat) the PT100 resistor with your finger, there should not be any big jump in the reading - maybe 1 ohm "more", this cause the aluminium plate is connected to the resistor.

    Here is the P/N number of the used Terminal Block:  

    MKDS 1/ 4-3,81 SMD

    And here is where you find them:

    http://www.tme.eu/gb/details/mkds1_4-3.81smd/pcb-terminal-blocks/phoenix-contact/mkds-1-4-381-smd-bk-1727256/

    OK., good luck.

    Thanks

    Torgeir.

    Thank you so much @Torgeir!

    A metal plate does lift up and close the opening if I close the terminals, but it is missing the plate at the back. The wires also seem fine, but I will go ahead and replace the terminal in case anything happens in the future. The links are highly appreciated!

    As for the pt100, I am currently printing something, so I'll wait until it's done and check on that as well.

    Once again, thank you so much for your help!

  • Link to post
    Share on other sites
    Posted · Heated Bed Errors - Screw Terminal? pt100?

    Hi, maybe old post, but I'm experimenting the same symptoms as @Nerdwarrior, cables were rechecked but my sensor sense ok till 60/70 degrees, then it start to fluctuate and reached the maxtemp error. Will check the block tomorrow, maybe I got the same issue.

     

    But my question is that I searched the web but cannot figure where is the bed pt100 sensor located, cables are ok, but its on the block or integrated to bed? (didn't think it in the block ...)

     

    Regards.

  • Link to post
    Share on other sites
    Posted · Heated Bed Errors - Screw Terminal? pt100?
    13 hours ago, lgalindo said:

    but cannot figure where is the bed pt100 sensor located, cables are ok, but its on the block or integrated to bed? (didn't think it in the block ...)

    Didn't mind, I found it on another post, its a SMT RTD component located just at the side of the block, will try to verify if the tracks are well.

     

    Asked myself if I could replace it with a oem component (pt100) glued to bed ...

  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
    • Our picks

      • Ultimaker turns 10: A look back
        Ultimaker is turning 10 years old and that means it is story telling time! We'll explore 2010-2014, traveling through the evolution of the business from the Protobox and Ultimaker Original, to the major leaps forward with the Ultimaker 2 and Ultimaker 3.
          • Like
        • 0 replies
      • Ultimaker Transformation Summit
        Visit our virtual showroom and learn more about the Ultimaker ecosystem!
        • 14 replies
      • New here? Register your Ultimaker for free 3D printer onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 4 replies
    ×
    ×
    • Create New...