Page 8 of 8 FirstFirst ... 45678
Results 71 to 76 of 76

Thread: Thermotek Chillers Exposed! (TEC Question)

  1. #71
    Join Date
    Feb 2009
    Location
    Surrey, UK.
    Posts
    234

    Default

    Having said that - its only a 16x pic that would be easy to write your own code for if you found where the pin-outs went

  2. #72
    Join Date
    Aug 2007
    Location
    Europe - Switzerland, France and Germany
    Posts
    28

    Default Thermotek failures (continued)

    Sorry for reviving a zombie thread, guys and gals.

    I picked up 2 dead ThermoTek T255P units, both with earth faults. I took one apart (talk about maintenance-unfriendly) and discovered that leakage of coolant around the upper heat exchanger port had caused some kind of electrochemical etching of the HE alloy underneath the Peltier element, which also eventually led to a failure of the Peltier and a low resistance current path from the Peltier to ground. See pics.

    Click image for larger version. 

Name:	IMG_2538.JPG 
Views:	21 
Size:	2.22 MB 
ID:	56999 Click image for larger version. 

Name:	IMG_2539.JPG 
Views:	21 
Size:	2.66 MB 
ID:	57000 Click image for larger version. 

Name:	IMG_2542.JPG 
Views:	22 
Size:	2.48 MB 
ID:	57001

    As the SMPS outputs are not completely isolated from the mains supply, this led to an earth leakage current on the supply side.

    I took out one of the Peltiers from the other unit and successfully made one working chiller from the two dead ones.
    Last edited by iggythebrush; 09-06-2020 at 00:26.

  3. #73
    Join Date
    May 2007
    Location
    Minnesota
    Posts
    160

    Default Thermotek chiller

    Just curious if you have a spare controller board from these chillers that look like the one I attached. One of the mosfets went bad, and I am having trouble finding a replacement.

    Let me know

    Thanks
    George
    Attached Thumbnails Attached Thumbnails image3.jpeg  

    image2.jpeg  

    image1.jpeg  

    image0.jpeg  


  4. #74
    Join Date
    Aug 2007
    Location
    Europe - Switzerland, France and Germany
    Posts
    28

    Default Controller

    Quote Originally Posted by hologeek View Post
    Just curious if you have a spare controller board from these chillers that look like the one I attached. One of the mosfets went bad, and I am having trouble finding a replacement.

    Let me know

    Thanks
    George
    Hi George,

    For some reason I canít see the picture but I definitely have a spare controller board, I did not throw anything away that wasnít fried...

    But itís halfway across Europe in my ďother laser partsĒ shack (donít ask, itís a very embarrassing condition beyond medical aid), and with the current COVID-19 restrictions in force I probably wonít get there until late October.

    If it can wait, just keep reminding me.
    Ilya

  5. #75
    Join Date
    Aug 2007
    Location
    Europe - Switzerland, France and Germany
    Posts
    28

    Default

    Quote Originally Posted by hologeek View Post
    Just curious if you have a spare controller board from these chillers that look like the one I attached. One of the mosfets went bad, and I am having trouble finding a replacement.

    Let me know

    Thanks
    George
    PS you can get these MOSFETs from China: https://www.ebay.com/itm/1-x-IXFK20N...cAAOSwrWBd5iwn

    Best wishes

  6. #76
    Join Date
    May 2007
    Location
    Minnesota
    Posts
    160

    Default Thermotek chiller

    Hi Ilya,

    Excellent, Thanks!

    -George

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •