Changes between Version 14 and Version 15 of Mendel3DPrinter


Ignore:
Timestamp:
03/10/18 15:02:53 (6 years ago)
Author:
Rick van der Zwet
Comment:

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  • Mendel3DPrinter

    v14 v15  
    7373=== March 10, 2018
    7474
     75==== Dead PSU Controller
    7576
    7677{{{
     
    109110Bed temperature reported using M105 was incorrect since power supply was faulty causing interference on the IC measuring the temperature. Replaced power supply, all happy again.
    110111
     112==== Dead PSU heatbed
     113
    111114My resistor bed consist of of 4 x 2R2 (WH10) in series resulting in 9 Ohm, PSU does not like this low load conditions or is simply broken which would make my 2nd dead power supply. The new PSU is only 12V which is not heating up properly. According to [https://en.wikipedia.org/wiki/Ohm%27s_law Ohm's law] (I = V/R or R = V/I or V = IR) and my resistor rating i get 1.3A, which in result would yield only (W = VI) 15.6W heating power, not sufficient since my total resistor capacity is 40W. Which would give me W = VI combined with V = IR becomes W = IRI. W=40, R=9, makes I = 2A. Which in result would require V to be 40W / 2A = 20V. To fix this I will need to change the resistor bed layout. Instead of 4 in series. Put two in parralel and next two pairs in serie.