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The issue with the thermistor inputs comes from the fact that the hot end has a voltage greater than the thermistor can get. It's easy to get a loose thermistor wire shorted to a hot end wire, blowing your input. I've seen it countless times and even in a recent 3D Printing Today podcast (ep #133) one of the guys mentioned it happening to him.
While it can happen with end stops, it's less likely
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Cefiar
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Controllers
Some thoughts:
1. Maybe we should review the thing from scratch and re-layout everything? There were issues with current loops in the ground traces on V1 that caused problems, and while vastly improved I'm not 100% sure they're gone in the existing V2. The thermistor and end-stops were real bug-bears, and the traces from the Arduino to the related inputs in many cases were quite long (eg: therm
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Cefiar
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Controllers
Can we perhaps consider renaming it to something else? I think Geeetech has really burned people on the RAMPS-FD name.
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Cefiar
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Controllers
As for phpBB,
The problem with phpBB is that while it works, it's not really better for administration than Phorum.
Many times in the past, Captcha support has broken (automatically allowing people to register) or methods for bypassing it have been found rendering it useless. Add that to the regular case of the Captcha systems being broken (whether through brute-force, or by handing off to chea
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Cefiar
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Administration, Announcements, Policy
Your power supply should be fine. The fuse is underrated for what you're doing however. The board may not quite be capable of what you're expecting though.
What are the hot end heater blocks you're using rated to? If they're 12V heaters running at 24V, they will draw 4x the current that they do at 12V. You might be fine most of the time if you're doing PWM, but PWM isn't a substitute for using t
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Cefiar
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Controllers
The IRLB3034 is better based on just those specs, but you probably want to dig a little deeper just to be sure.
Given the recommendations here for that FET tho, I think it'd be a safe choice.
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Cefiar
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Controllers
I suspect they've made their own changes and labelled it V1.2. My guess is it's V1 with a few small changes and nothing like the V2 design.
Also: All the pics on the item page AND on the WIKI are of the V1 design (as of when I'm typing this). If they can't be bothered updating their pictures, why should you trust them to be selling what they claim they are?
Without one of their boards in my han
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Cefiar
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RAMPS Electronics
As one of the people who worked on the design for RAMPS-FD, I would implore you to NOT BUY A RAMPS-FD.
1. Geeetech still sell this despite issues with the board.
2. Geeetech specifically started building boards while the design was still in Beta, without even checking to see if the design worked.
3. Geeetech have (in many cases) supplied boards with the incorrect components (eg: PTC fuses inst
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Cefiar
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Controllers
Assuming the pin pitch is right, they're pretty much the same. I'd suspect that they're a copy of those Molex KK's.
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Cefiar
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RAMPS Electronics
One of the things vreihen suggested was to get the Phorum people to host it. That would imply a move, rather than an upgrade, which would mean that DNS would have to change.
The issue is getting people who have the time to admin the setup. The current people are time-poor, going by everything mentioned in this thread, which does make the idea of having the Phorum people host it attractive, as th
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Cefiar
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Administration, Announcements, Policy
tadawson: Err, if you're moving the data to a new server with a different IP, then you're going to be changing DNS.
If you think you can get just a single IP routed anywhere in the world to a new server, then you're in for a shock - that's not how things work.
The only way we'd be able to keep the IP is ASSUMING that we stay with the same company, and assuming they build a new VM for us in the
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Cefiar
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Administration, Announcements, Policy
You probably shouldn't use those sensors directly hooked to pretty much any Reprap electronics.
The inputs for Endstops should never get any more than 5V, else you'll fry the inputs on the microcontroller (the ATMega chip on the Arduino Mega in the case or RAMPS). If you're lucky, you'll only have fried the one input for the Endstop in question. You might be able to use another digital input in
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Cefiar
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RAMPS Electronics
While I currently don't have the time to actually help out on an admin level (this might change, but I can't guarantee any free time atm till November), I can give people some idea of what might be involved in doing a move. Some of the details will depend on certain other tools that are in use.
I have some experience with Phorum (I set up a test install to play with it and test various Phorum mo
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Cefiar
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Administration, Announcements, Policy
Peddipath: If your PSU isn't up to the task of running the heated bed AND all the rest, then you can use TWO PSU's with RAMPS as you've got 2 power inputs.
Connect your smaller PSU to the 5A input. This runs the motors and the hot end.
Connect your larger PSU to the 11A input. This runs just the heated bed.
This assumes that the PSU is losing volts when your RAMPS board tries to run everything
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Cefiar
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RAMPS Electronics
Also might want to make sure that the cable and connectors that connect your Z motor are solidly connected and not intermittent in some way. Also check the solder joints on the RAMPS board for the sockets that connect the drivers to the board, and the connector for the Z headers.
If the motors become disconnected while the unit is powered on, you're more likely to damage the drivers, especially
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Cefiar
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RAMPS Electronics
I would make sure you've got the polarity for the 5A input the right way around, and make sure you've got the stepper drivers plugged in correctly and not off-by-one hole.
This might help:
Note: Where the diagram uses black and yellow for the PSU wires, you can use the black and yellow wires on the ATX.
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Cefiar
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RAMPS Electronics
RAMPS is OLD. It's not by default compatible with the Due.
There are no plans as far as I'm aware for an updated RAMPS. It also has an issue with heatbeds running at >16V, due to the use of a PTC fuse that is only rated to 16V. It's an old design that has probably had its day.
A few people have made RAMPS-like boards that work with the Due (eg: RADDS). Note that RAMPS-FD is not really well s
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Cefiar
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RAMPS Electronics
Check the labelling on the FETs to make sure what they are. Some cheap suppliers replace them with even lower spec devices than the original designs call for (and even those are under spec IMO). Plus, some of the cheap suppliers have such bad QA processes (ie: none) that somehow instead of FETs, you end up with some other device (ie: they weren't paying attention during assembly).
To stop power
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Cefiar
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RAMPS Electronics
Related: [3dprint.com]
Hopefully the details will be released soon.
Note: With a rotating bed, one thing you definitely need to think about is the level of the bed. If it's not flat (and you can't compensate for whatever reason, be it design, lack of a sensor, etc), you will have issues with objects sticking to your bed.
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Cefiar
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Developers
I'd be looking at the connectors. Not all connectors are the same, and it's possible you've got a dodgy set.
Q: How did you check ampage (the current)? You need to put your meter in series with the board to do that, and there should only be current drawn if it's working. If you've got one of the connectors the wrong way, you will get a short, which might explain it. If you get both the wrong way
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Cefiar
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RAMPS Electronics
Note: If you have an external 5V source (eg: a 5V line from a PC PSU), then you can supply RAMPS completely with this 5V source.
You need to:
1. Remove D1. This stops RAMPS supplying voltage to the on-board regulator.
2. Connect your 5V source to a 5V/VCC line on the RAMPS/Arduino. Note that there is a "second" 5V line that goes to the servos that ISN'T connected to the main 5V line by default
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Cefiar
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RAMPS Electronics
dc42: Have you run these motors on these drivers yourself? I've done it and burned my fingers on the motors with the absolute lowest current setting using as low as 9V into the driver motor side. I didn't have access to a variable supply at the time to take it down to about 8.5V. This is the lowest I'd run the drivers VMOT at, even though they should go down to 8v.
You can't turn the current dow
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Cefiar
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RAMPS Electronics
@Wurstnase: That is fine with normal motors, but the motors in CD/DVD Roms and the like get VERY hot if you put too much voltage into them. They have very little thermal mass to absorb that heat, and they also have very little surface area to dissipate it. They're also designed specifically for running off a 5V source, so the coil voltage is even lower than you might be used to with standard size
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Cefiar
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RAMPS Electronics
A stepper controller specifically for 5V stepper motors (DRV8834) will get you a lot better results than using the standard ones (eg: A4988, DRV8825) at 12V.
Issues: Pinout is different, so would be incompatible with the RAMPS board as-is.
Note: If you want to continue using DRV8825's or A4988's, recommended to use a lower voltage (eg: 8-9V) rather than 12V. This will reduce the max voltage the
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Cefiar
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RAMPS Electronics
RampsFD V1 had issues where if the software on the Due crashed, the heaters would remain enabled and you could end up with a fire or meltdown if your machine was left unattended.
There were a number of other issues. The board was NOT finalised (it was still beta), yet Geeetech still continue to sell it, despite numerous attempts by bobc and myself asking them to stop selling it. Note also that t
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Cefiar
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RAMPS Electronics
There are problems with using the Due with the standard RAMPS boards. That was the reason Bob and I were working on RAMPS-FD. Bob and myself just dropped the project after a bunch of issues where we both pretty much decided that the hassle we were getting from various people simply wasn't worth it, and we both ended up quite time-poor to work further on it. The fact that Geeetech simply took the
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Cefiar
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RAMPS Electronics
kscharf: The 1mm^2 wire between the thermistor ground and the main ground fixes the thermistor issues. Induced current from the switching of the FETs causes a voltage to appear between the thermistor ground and the main ground, leading to the thermistors giving incorrect readings.
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Cefiar
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RAMPS Electronics
Just of note:
The 11A polyfuse is only rated for 16V. This means that if your bed develops a short, you'll be putting too much voltage into the polyfuse.
Too high a voltage with a short can result in the polyfuse actually catching fire (yeah - this is why I hate polyfuses).
It's recommended to replace the 11A polyfuse with a real 15A fuse (eg: an automotive blade-style or even just a standard
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Cefiar
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RAMPS Electronics
Hi Matt!
I sort of guessed this might be the case, but given I wasn't hearing anything of the sort back, it's hard to know what was the bottleneck.
I'm happy to donate some time if required, but also equally happy to give details on installing these modules and what needs to be done.
I'll come up with a guide on what needs to be done and get back to you. Might take a few days simply due to my
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Cefiar
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Administration, Announcements, Policy
As olisoft so very kindly pointed out, there are zip files at the top of each thread. Those zip files contain the latest version of the add-on(s) for Phorum that implement the features.
Replace: The work is done. It just needs the Reprap forum admins to implement. My comment so far has been that NONE of them seem willing to implement these add-ons for the Reprap Phorum installation.
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Cefiar
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Administration, Announcements, Policy
Page 1 of 37
Pages: 12345
- 9 years ago