1 Topic by andrew.petereck

  • andrew.petereck
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Topic: Solidoodle workbench heater pad

Is there anybody out there that can tell me why the solidoodle workbench heater pad has 4 wires for the heating element instead of 2 like every other silicone heater pad I've seen? I'm assuming two different heating elements, however, after checking continuity through all 4 wires, it appears they are all connected. The only reason I ask is I'm trying to replace the board to an MKS GEN V1.3 and none of the connectors fit, so I'm essentially rewiring the entire machine and I'm rather stumped by this heater pad. Any advice or help would be greatly appreciated.

2 Reply by wardjr

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Re: Solidoodle workbench heater pad

It's basically 2 12v coils using a common ground.  Test your PSU output to verify which is which.
++
- - (these two could really be just one bigger wire)

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3 Reply by andrew.petereck

  • andrew.petereck
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Re: Solidoodle workbench heater pad

Thanks for the post, unfortunately the board to the bed heater is crap and no longer works, so I can't figure out what the 4 wire configuration is. When I test continuity on the board I'm getting all different values. I'm thinking I'll just get a new heater that is two wire.

4 Reply by wardjr

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Re: Solidoodle workbench heater pad

You will not be able to get enough power for a bed heater that size @12v using a 2 wire heater.
Further more you'll be hard pressed to find a board with a big enough mosfet to handle that much current.  There are numerous options but if your current heater works keep it.  Then if you need a new board and it is only set up for a 2 wire heater as most are.  You could use SSR's to connect the heater.  Then the board circuit only has to handle the current of the relays.
You can test your heater wires for resistance instead of continuity.  When the two common grounds are tested you should read zero ohms.  When connected to a ground and a heater lead you'll get some number greater than zero.  If you can't figure it out just let me know and I can pull mine apart enough to sort which wires are which for you.

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

wardjr's Website

5 Reply by andrew.petereck

  • andrew.petereck
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Re: Solidoodle workbench heater pad

Thanks for the help. Determined the two wires that are the neg and the two that are the pos. Why was the old board from Solidoodle able to handle the heater bed, but my new board won't? It looks like the old circuit board combined the two wires at the connector anyway. I have an MKS GEN V1.3 I'm trying to replace the old board with. Couldn't I just combine the NEG and POS wires and plug them into the two wire connector on the new board? Or will that pull too much and ruin the board?

6 Reply by wardjr

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Re: Solidoodle workbench heater pad

You'd have to verify the rating of the mosfet on the new board.  If I recall the SD daughter board ran the heater through 2 mosfets.  Basically 2 heater circuits running at the same time.

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

wardjr's Website