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Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

QuoteMatthijsW E3D-online.com was kind enough to send a replacement! I will receive the heated bed next week I received a new heated bed. This one also had a to high resistance of 7.9 ohm. I called e3d and during the phone-call they tested a couple of MK3 heated beds that they had in stock and it turns out a whole batch was faulty. They put the product out of stock and i got a refund. E3D

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

E3D-online.com was kind enough to send a replacement! I will receive the heated bed next week

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

QuoteAndrewBCN QuoteViper97 Thanks Andrew... appreciate the sharing of knowledge. You are welcome! QuoteMatthijsW ... My Heated bed has a resistance of 8 Ohm. ... 24V on 8 Ohms gives you 3A, and 24V x 3A = 72W which is not good enough to heat up the MK2 or MK3 heatbeds. Conclusion: the resistance of your heatbed is out of spec by at least 30%. Thanks for all the help! I was afraid this was t

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

QuoteViper97 My 12v system does from 22C to 45C in about 3 minutes... 30 seconds more than yours does. I've never really measured how long it takes for the 24v system to kick in but I know it's under 4 minutes to 100C... so as Andrew said (and he has far more experience at this than I) it would be good to break out the multimeter and take some measurements. Oh and as a side note, I've got a lot

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

QuoteAndrewBCN QuoteMatthijsW ... I am running on marlin. The setting i use is ( I lowered the maxtemp from the default settings): BED_MASTEMP 120 I have changed it now to 130 I will test this right now. Unfortunately in your case this is unlikely to change anything, and will not solve the problem. I accidentally did a reply instead of a quote so do not now if you will read my message

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

QuoteAndrewBCN Hi, Just my $0.02 here. A simple method to check wiring, controller board, MOSFET, heatbed, etc. 1. Measure the DC voltage across the heatbed terminals when you are heating it, and measure the DC voltage across the power supply terminals too. 2. You should have approx. 24V DC at the PSU terminals, and a little bit less than that, say ~23.5V DC, across the heatbed terminals. 3. W

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

Ahh thats to bad. thanks for your help though.! I have measured the time to heat up to 55 degrees Celsius. From 32 degrees ( it is freeking hot here) to 55 degrees. in exactly 150 seconds. I think this is very long for a 24 volt power supply. Greetings. Matthijs

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

QuoteViper97 Okay... what software are you running. The wiring looks okay to me so I think you're fine there. If you're using Marlin in the configuration.h there is a line of code there like this: #define BED_MAXTEMP 150 (Mine is set to 150 so if you want you can change it to something like 115.) If BED_MAXTEMP is less than 110 that might be part of the problem as it will cause the circuitry

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

QuoteViper97 It could be faulty, your power supply or the board. The 24.5v you measured was that under load? (Heat bed heating up.) 15 amps is what I've got for a 24v power supply, I'm running it at 26V out (load factor). Are you running an ac-dc relay on a RAMPS 1.4? What electronics? What wiring diagram can you put up to help troubleshoot this problem. I have mine wired up similar to this

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

QuoteViper97 Your heated bed is like mine. As your picture indicates the first single soldering pad is labeled on mine as #1 (in your picture, the pad on the right side). The one closest to it is labeled #2 and the furthest pad from #1 is labeled #3. So #1 is a single pad, and pads two and three are grouped together. To wire 24V to them you would attach a +24v to pin #2 and the -24v to pin #3

by MatthijsW - Reprappers

Re: MK3 Heated Bed 24 Volt heating problem - 9 years ago

Hello, Thanks for the fast response. As i tried to explain in my question. I already did connected my wires like you explained. It is fine to hear this! So the wiring is good i think. Could the heated bed be faulty? I have a 15 amp power supply only for the heated bed so i think that is enough. any other suggestions? Greetings Matthijs

by MatthijsW - Reprappers

MK3 Heated Bed 24 Volt heating problem - 9 years ago

Hello people from Reprap Forum, Problem: heated bed does not reach desired temperature (70 degrees celcius). The MK3 heated bed: link: Also a picture in the attachments First i had the heated bed connected to my 12 volt power supply. The heating up time to 55 degrees was very long (12 minutes or so). Now i have connected the heated bed to my new 24 volt power supply. It heats up faster but i

by MatthijsW - Reprappers

Re: Autobed leveling with inductive sensor. trigger problem - 9 years ago

SOLVED I solved the problem i forgot to comment out this lin: //#define ENDSTOPPULLUPS // Comment this out (using // at the start of the line) to disable the endstop pullup resistors

by MatthijsW - Reprappers

Autobed leveling with inductive sensor. trigger problem - 9 years ago

Hello RepRap community, I am Matthijs and this is my first question on the RepRap forum. I have a question about autobed leveling with an inductive sensor. I have an inductive sensor which is called a LJ12A3-4-Z/BX. connected to my megatronicsV3 zmin enstop I have te same sensor and the same resistor values which is used in this video see the attached picture for my settup I think the pro

by MatthijsW - Reprappers