Posts made by bdelia

When I try to set my hot end temp to 235C the DSW reports it at around 245C. I am not sure what to check or what to do. I have done an AutoTunePID for the hotend but that did not fix the issue. Any thoughts would be appreciated.

Thanks! That helps and is what I was mostly thinking

Hello,

I am new to Duet and Reprap and trying to leverage the Manual Bed Leveling Assistant to help level my bed. When I get presented the output of the assistant it will be similar to the following:

Manual corrections required: 0.00 turn up (0.00mm) 0.34 turn down (0.17mm) 0.31 turn down (0.16mm) 0.46 turn down (0.23mm)

I am curious to verify when the assistant states I should "turn up" a knob does that mean get the bed closer to the nozzle or further away?

Thanks

@bearer I will definitely look into that, thanks

Is the consensus then that this bed is safe with how I have it set up?

I run a Mosfet between the Duet 2 Ethernet and the bed, I will be upgrading the 14 gauge wire to 10 gauge as recommended in a previous post.

I just got word from Zyltech that they updated the specs based on my experience...I guess I am also confused how the dual power works, most dual power beds I have seen you need to solder differently to change the input voltage.

http://www.zyltech.com/zyltech-3mm-aluminum-heated-heat-bed-3-sizes-available/

300 x 300mm MK2A Heated Bed

Outside dimension: 330x330 mm
Usable size: 300x300mm
Resistance: 1.05-1.3 ohm for 12V
Resistance: 1.5-2.2 ohm for 24V
Voltage: 12-24 V (recommend 24V for better performance)
Pre-wired with thermistor and power cable

@dc42 said in MK2A Heated Bed causes board to crash:

about within the rating of the Duet. The hot end po

Thanks for all of this discussion folks.

If I read the comments after I posted the link to the bed and specs, can I assume you all feel this board can be used safely at 24V?

I do run an external Mosfet and I will get 10 gauge wire to help with safety from the Mosfet to the bed.

I am in a email conversation with the seller and am trying to determine if I should ask to return this board and look for something else. I do not want to introduce AC power as I am not yet comfortable with that concept, it feels more nuanced from a safety lense.

Thanks
Brett

@Phaedrux said in MK2A Heated Bed causes board to crash:

Do you have a link to the item you've purchased?

Here is a link to what I purchased:
http://www.zyltech.com/zyltech-3mm-aluminum-heated-heat-bed-3-sizes-available/

If you look at the description I purchased the one labeled as 300 x 300 MK2A Heated Bed.
300 x 300mm MK2A Heated Bed

Outside dimension: 330x330 mm
Usable size: 300x300mm
Resistance: 1.05-1.3 ohm
Voltage: 12-24 V (recommend 24V for better performance)
Pre-wired with thermistor and power cable

@Phaedrux said in MK2A Heated Bed causes board to crash:

Does your board have 2 solder pads or 3? The photo is a bit blurry.

@bdelia said in MK2A Heated Bed causes board to crash:

If the above is accurate then it seems the bed is on the fringe of 24V compatible? Does that sound correct?

No. 1.4ohms would still indicate 12v. I think you're hoping pretty hard that this is just going to somehow work. I think your seller is clueless and is leading you astray. There's no way I would connect 24v power to that heat bed and leave it unattended in my own house.

Thanks for your thoughts. I have sent an email to my supplier for the bed and am waiting for a response. Worst case I am out about $50 for the bed and will have to source another one.

Does anyone here have a recommendation for a 24V 300x300 heated bed? I would prefer to source in the USA if possible for shipping timeliness.

Thanks
Brett

@Phaedrux said in Manual Bed Leveling Assistant huge values returned:

@bdelia said in Manual Bed Leveling Assistant huge values returned:

;M561 ; clear any bed transform

You may want to uncomment this, because you would want any mesh compensation or other bed surface alterations to be canceled when doing the leveling.

Thanks for the tip

@dc42 said in MK2A Heated Bed causes board to crash:

If you set your multimeter to read resistance and then short the two probes together, what reading do you get? You need to subtract that reading from the 1.6 ohms that you measured.

When I read resistance by shorting the MultiMeter leads it reads .2 Ohms. So, if I understand you then that would mean my bed resistance, if measured at 1.6 is really 1.4 Ohms?

If the above is accurate then it seems the bed is on the fringe of 24V compatible? Does that sound correct?

Ok, first off I want to thank this community for always being willing to help out.

I think probing that one point twice that @BoA pointed out was the issue. I updated my bed.g file and all seems good now.

@Phaedrux said in Manual Bed Leveling Assistant huge values returned:

@bdelia said in Manual Bed Leveling Assistant huge values returned:

G28 ; home

What is in your homeall?

Here is my homeall

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v3.1.9 on Sat Dec 05 2020 14:37:53 GMT-0800 (Pacific Standard Time)
G91                     ; relative positioning
G1 H2 Z5 F6000          ; lift Z relative to current position
G1 H1 X-270 Y-295 F1800 ; move quickly to X or Y endstop and stop there (first pass)
G1 H1 X-270             ; home X axis
G1 H1 Y-295             ; home Y axis
G1 X5 Y5 F6000          ; go back a few mm
G1 H1 X-270 F360        ; move slowly to X axis endstop once more (second pass)
G1 H1 Y-295             ; then move slowly to Y axis endstop
G90                     ; absolute positioning
G1 X25.914 Y53.86 F6000 ; go to first bed probe point and home Z
G30                     ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91                    ; relative positioning
;G1 Z5 F100             ; lift Z relative to current position
;G90                    ; absolute positioning

@BoA said in Manual Bed Leveling Assistant huge values returned:

Probing twice the same point?

G30 P0 X26 Y226 Z-99999 ; probe near an adjusting screw
G30 P1 X26 Y226 Z-99999 ; probe near an adjusting screw

Well that explains the double tap on that corner Thanks for the proofreading!

@Veti said in MK2A Heated Bed causes board to crash:

2mm^2

I am using 14Gauge wire from my external Mosfet to the Bed.

@bearer said in MK2A Heated Bed causes board to crash:

https://reprap.org/wiki/PCB_Heatbed site suggest 1.7 is for 12v beds, but they also say the size of the MK2A is smaller there. anyways it also has pictures showing how the dual voltage beds have different connections for 12 an 24v. might be helpful

I just double checked resistance, it reads 1.6Ohms.

I will review the specs on the page you shared. When I talked to the seller they said that this bed gets wired the same regardless of 12V or 24V. I will also contact them again and let them know the resistance I am getting and see if they feel that I have a defective bed or not.

Here is a picture for their website of the board I have for reference.

@Veti said in Manual Bed Leveling Assistant huge values returned:

@bdelia

just run a G29 and look at the image. it will help

Ok, will do once I get back home. Thanks for the assistance in this.

@bearer said in MK2A Heated Bed causes board to crash:

@bdelia said in MK2A Heated Bed causes board to crash:

Is there a way to confirm this with a multi-meter or other mechanism?

disconnect the wires from the bed terminal and measure the resistance across them

and sure, it can be dual voltage, but its not automatic

I appreciate everyone's help on this and guidance. I will check resistance once I get back to the house. If I recall I believe the resistance was 1.7Ohms when I initially checked.

Yes, I little. However, I have done my due diligence and contacted the seller, Zyltech, and have confirmed this board is a dual voltage bed as I believe I have mentioned already.

Is there a way to confirm this with a multi-meter or other mechanism?

I have not created a height map yet. I am trying to set up my Capacitive NPN switch and the suggested steps include to first manually level the bed. I have done that by hand, now I wanted to get the Manual Bed Leveling Assistant working so I can dial in the bed level as best as possible before creating that height map.

Do I have the steps wrong?