24V 300x300 MK2A Heatbed Hello! Sorry for my bad english! I'm fairly new here in the 3D printing world and I just bought a Wanhao i3, but I was not really happy about the size so I build a 3D printer with a 300x300 MK2A Heatbed and dual (E3D V6 Extruders) I want to drive it at 24V? Iv'e ordered a (BBP Fastbot) 3D Printer Controller Board BBP1S I calculated that it would draw somewhere about 15Amps at 24V (1.6 ~ Ohms) each stepping motor (NEMA 17) rated for 1,7Amps each, and I will use 6st step motors in total. Stepper motor (42BYGHW609) 1x X axis GT2 Belt, and 20 teeth pulleys 1x Y axis GT2 Belt, and 20 teeth pulleys 2x Z axis 2x lead screws (8mm) 2x Bowden Extruders (E3D V6) (Mk8 Gear) + 2x 24V 25W heater cartriges (E3D V6 Bowden) 2x 24V fans (extruder cooling Fans?) will the (3D Printer Controller Board) Manage running (30 ~ A) or do I have to run a relay in parallel with the controller board? Or is 30A even enough? Sincerely https://reprap.org/forum/read.php?1,579997,579997#msg-579997 Sat, 10 Oct 2026 16:40:43 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,579997,580482#msg-580482 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580482#msg-580482 What happens if the ssr breaks?
Worst case scenario?]]> Zuxztah General Thu, 05 Nov 2015 15:44:45 -0500 https://reprap.org/forum/read.php?1,579997,580458#msg-580458 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580458#msg-580458
Quote
Zuxztah
It's the heat from the ssr that's the problem? And maybe some power drop? Cause to slower heat up time? With the cheap ssr's?

Yes. Cheap DC-DC SSRs drop between 1.5V and 2V. If your bed heater draws 15A @ 24V, than that's between 22.5W and 30W of heat generated by the SSR that you need to get rid of, and up to 15% loss of bed heating power.]]> dc42 General Thu, 05 Nov 2015 14:50:53 -0500 https://reprap.org/forum/read.php?1,579997,580316#msg-580316 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580316#msg-580316
I will build a aluminum enclosure 5mm sheets for both power supply and controller board and mount the ssr to the inside wall with som thermal paste/glue and maybe add a 24V fan to cool it?

It's the heat from the ssr that's the problem? And maybe some power drop? Cause to slower heat up time? With the cheap ssr's?]]> Zuxztah General Thu, 05 Nov 2015 08:42:50 -0500 https://reprap.org/forum/read.php?1,579997,580310#msg-580310 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580310#msg-580310
The brief specification of the Power Expander is given on that page I linked to, however it didn't show up on my smartphone, only on my PC.

The draw of that bed heater should be about 15A, so in theory a SevenSwitch would just about handle it. However, the Power Expander looks a better bet because the ground wiring will be less critical, owing to the isolation it provides from the control input.

Personally, I use AC mains power to drive large heated beds, because that allows the use of a small power supply and a low-cost DC-AC SSR to switch the bed. However, use of AC mains power requires additional safety precautions to be taken, and I don't recommend it unless you are knowledgeable about AC mains wiring, protective grounding etc.]]> dc42 General Thu, 05 Nov 2015 08:26:27 -0500 https://reprap.org/forum/read.php?1,579997,580291#msg-580291 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580291#msg-580291 Or maybe I'm just blind xD]]> Zuxztah General Thu, 05 Nov 2015 08:00:36 -0500 https://reprap.org/forum/read.php?1,579997,580289#msg-580289 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580289#msg-580289
Only the power supply Alone costs 167~ gbt then a ssr for another ~100gbt:/ wow...

I will buy one if I have to.]]> Zuxztah General Thu, 05 Nov 2015 07:55:16 -0500 https://reprap.org/forum/read.php?1,579997,580285#msg-580285 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580285#msg-580285
This device [reprap.me] looks promising, but I don't have one, neither have I seen any reports on how well it works.]]> dc42 General Thu, 05 Nov 2015 07:45:32 -0500 https://reprap.org/forum/read.php?1,579997,580250#msg-580250 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580250#msg-580250 -Olaf]]> o_lampe General Thu, 05 Nov 2015 05:59:52 -0500 https://reprap.org/forum/read.php?1,579997,580211#msg-580211 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580211#msg-580211 Powersupply + > relay pin 30 > relay pin 86 > Heatbed terminal +

Heatbed terminal - to Common grund on the power supply?

Would work if the HBP (HeatBedPlatform) output port puts out on/off signal?]]> Zuxztah General Thu, 05 Nov 2015 04:36:13 -0500 https://reprap.org/forum/read.php?1,579997,580206#msg-580206 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580206#msg-580206 I Don't really know how the heatbed electronics works in detail?

assuming it's a power mosfet that triggers the heatbed on/off until it reaches the desired temp?
No pwm signal?

Or I might be lowering the voltage to 20V (lowest possible for the power supply I bought) but still there will be 12,5~ Amps? On the HBP port?]]> Zuxztah General Thu, 05 Nov 2015 04:25:48 -0500 https://reprap.org/forum/read.php?1,579997,580198#msg-580198 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580198#msg-580198 -Olaf]]> o_lampe General Thu, 05 Nov 2015 04:06:30 -0500 https://reprap.org/forum/read.php?1,579997,580190#msg-580190 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580190#msg-580190 [www.conrad.se]π=1293156

It's a Swedish "website" but the description is in English.

Will the controller board manage to supply the heatbed wit 15-20 amp? Without pcb burn? Or components burning up?]]> Zuxztah General Thu, 05 Nov 2015 03:33:19 -0500 https://reprap.org/forum/read.php?1,579997,580188#msg-580188 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580188#msg-580188 the stepper current of 1.7A is not the same current the driver is asking from the power supply.
I would try a 24V/19A PSU from Meanwell. Don't use a cloned one, I've seen they often miss some internal heatsinks.
-Olaf]]> o_lampe General Thu, 05 Nov 2015 03:29:07 -0500 https://reprap.org/forum/read.php?1,579997,580038#msg-580038 Re: 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,580038#msg-580038 The power supply is rated at 31,3 Amps. @ 24V]]> Zuxztah General Wed, 04 Nov 2015 17:30:15 -0500 https://reprap.org/forum/read.php?1,579997,579997#msg-579997 24V 300x300 MK2A Heatbed https://reprap.org/forum/read.php?1,579997,579997#msg-579997
I'm fairly new here in the 3D printing world and I just bought a Wanhao i3, but I was not really happy about the size so I build a 3D printer with a 300x300 MK2A Heatbed and dual (E3D V6 Extruders) I want to drive it at 24V?

Iv'e ordered a (BBP Fastbot) 3D Printer Controller Board
BBP1S
I calculated that it would draw somewhere about 15Amps at 24V (1.6 ~ Ohms)
each stepping motor (NEMA 17) rated for 1,7Amps each,
and I will use 6st step motors in total.
Stepper motor (42BYGHW609)

1x X axis GT2 Belt, and 20 teeth pulleys
1x Y axis GT2 Belt, and 20 teeth pulleys
2x Z axis 2x lead screws (8mm)
2x Bowden Extruders (E3D V6) (Mk8 Gear)
+
2x 24V 25W heater cartriges (E3D V6 Bowden)
2x 24V fans (extruder cooling Fans?)

will the (3D Printer Controller Board) Manage running (30 ~ A) or do I have to run a relay in parallel with the controller board?
Or is 30A even enough?


Sincerely]]> Zuxztah General Wed, 04 Nov 2015 16:15:05 -0500