So here is the issue I am having now when heating the bed.

3D Printing
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1

So here is the issue I am having now when heating the bed. The bed will get up to temp then suddenly I have stepper faults and everything shuts down. It doesn’t seem to matter if I am going to 35c or 100c, when it gets to temp everything crashes. Below is what I can get from the logs when this happens. I tried turning logging up to debug but the steppers just start vibrating when I turn everything on and I can’t ever access Octoprint, but I can SSH in.

WARNING Heater time update large: E temp: 30.265003748 time delta: 0.253293991089
WARNING Heater time update large: H temp: 0.0 time delta: 0.253234863281
WARNING Heater time update large: HBP temp: 32.9619144239 time delta: 0.505464792252
INFO End Stop Z2 hit!
ERROR Alarm: Stepper X
INFO End Stop Y2 hit!
INFO End Stop X2 hit!
INFO End Stop Z1 hit!
ERROR Alarm: Stepper E
ERROR Alarm: Stepper
ERROR Alarm: Stepper Z
ERROR Alarm: Stepper Y

2

What current are you setting your steppers to run at? Are there any radiators to cool them in place? Typically stepper driver alarms are due to the drivers overheating. I have a small fan blowing air across the top of my cape with heatsinks on each driver chip.

3

My current is set to 0.5 right now, but just in case I also set them to 0.1 and I get the same issue. I have a fan blowing across the steppers as well. The printer will print without the bed but that part seems to be the key to the issue. Could this be a bad power supply causing replicape to misinterpret the problem? It is a 500w single rail PC power supply but it might be bad.

4

That could be. If your bed is drawing too many amperes, the voltage to the steppers will drop. What PSU do you use?

5

That is a weird issue! The “delta time” for E means that redeem was not able to get temperatures for 30 seconds. I’ve seen this happen during start-up sometimes, but only with ~1 second. And the steppers are working fine without the heated bed? Can you post a picture of your board with connections?

6

Elias, I seem to remember someone else had a similar delta time issue because they were using a D1W thermal sensor, no?

7

I just realized I pulled the timing out of those log files so its impossible to see if the deltas are related to this issue. I will double check to see if they are related time wise. Without the heated bed I can print just fine for at least 30 minutes as thats the longest print I have had. I will grab a picture of the board this evening. And here is the PSU.

http://www.frys.com/product/6893426

It powered the bed fine under RAMPs but I realize that likely has little bearing now.

8

So I bought a MeanWell NES-350-12. Since my bed can’t run 24v this should do fine until I build the D-Bot I want and end up needing a new bed.

9

So the new PS runs the bed fine. I am not sure why the PSU did not have issues doing a bed PID tune, but caused a bunch of issues when reaching print temp regardless of actual set temp.

10

@James_Brassill that is interesting! I’d be interested in seeing the data for the actual PID tuning and I’ve thought of implementing a publishing function for it similar to the bed leveling algorithm, but I have not gotten around to it yet. If you have changed PSU, I won’t ask you for a screen dump though:)

11

I should still have the logs from the old PSU and can dig through them and find that data for the PID. I can also run one on the new PSU. I am thinking maybe holding it at temp caused some problem in the PSU and I had a current spike that caused replicape to shut down to protect itself. At this point I am just spit balling though.