April 29, 2019 at 2:29 pm #98624
Assembled my electronics today to see if everything arrived in working order and have ran into trouble. I was able to download and flash the firmware. I didn’t change anything in the firmware code, just verified and uploaded it.
When I try to move the steppers with the LCD or with Pronterface they just vibrate/make noise, but the shaft doesn’t turn. When the steppers are disabled the shafts will turn freely.
Board: Ramps 1.6 & Mega 2560 Stack
Drivers: DRV8825 (I tuned voltage pots to 0.75V) https://www.aliexpress.com/item/3D-Printer-Parts-StepStick-A4988-DRV8825-Stepper-Motor-Driver-With-Heat-sink-Carrier-Reprap-RAMPS-1/32965199683.html?spm=a2g0s.90423220.127.116.11424c4dFz7CTV
Power Supply: Kastar (https://www.amazon.com/gp/product/B003TUMDWG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)
Output of M115
FIRMWARE_NAME:Marlin bugfix-2.0.x (Github) SOURCE_CODE_URL:https://github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:V1 E CNC EXTRUDER_COUNT:1 UUID:cede2a2f-41a2-4748-9b12-c55c62f367ff
Output of M119
Reporting endstop status
Attachments:April 29, 2019 at 2:32 pm #98629April 29, 2019 at 2:36 pm #98630
Yes, three jumpers under all five drivers.April 29, 2019 at 2:38 pm #98631April 29, 2019 at 2:52 pm #98633
X Steppers vibrate/make pulsing noise for about 3 seconds. Afterwards LCD display shows X position as 30.April 29, 2019 at 2:54 pm #98634
Figured out why your endstops say triggered, are they not connected? Are those weird heatsinks shorting out your drivers?April 29, 2019 at 3:00 pm #98635
I don’t have the endstops connected as I’m just testing, is this an issue? If so, how do I test without endstops?
I shut it off, took of heatsinks and retried and got same result.April 29, 2019 at 3:40 pm #98637
Yes you need the endstops when using dual endstop firmware. Wired NC, you can short them if you know what you are doing, or edit the firmware but I suggest you just do it correctly an plug them in.April 29, 2019 at 3:43 pm #98638
I hooked one of the steppes up to my 3d printer extruder and it worked fine, so it would appear that it is not an issue with the steppers.April 29, 2019 at 3:47 pm #98639
Ok, I’ll wire up the endstops and report back.April 29, 2019 at 3:59 pm #98642
Ok, I jumpered the X and Y endstops and reran M119 to confirm.
Reporting endstop status
Stepper behavior did not change, still just vibrate and make a pulsing sound.April 29, 2019 at 6:18 pm #98649
Steppers have to be wired normally closed.April 29, 2019 at 6:34 pm #98651
How do I wire the steppers differently?April 29, 2019 at 6:38 pm #98654
DeekParticipantApril 29, 2019 at 6:42 pm #98655
I’ve tried the endstops both open and closed. When they’re open it shows is triggered, when they are closed they show as open. What am I missing?April 29, 2019 at 6:57 pm #98656
Okay, if it says open, then it’s correct. If you manually push one of the stop buttons while issuing M119, that one should show triggered. If that’s the case and you’re still not getting movement, then it’s time to test your stepper wires. The growling already has me thinking this is the case anyway. One of the pins isn’t connected at one of the connectors.April 29, 2019 at 7:50 pm #98659
I’ve reconfirmed that M119 is working correctly. When I remove a jumper it shows triggered, when I reinstall it then it shows closed. Still no movement on the steppers.
I’ve pulled out the extension cable I purchased from V1, and tried just the OEM cable. Still no movement on the steppers.
I pulled the OEM cables and checked continuity of each wire from one plug to the other for all five cables, all had good continuity. Reconnected everything and still no movement on the steppers.April 29, 2019 at 7:55 pm #98660
Matt K. on facebook suggested checking the cables to ensure they have the inner wires cross over. I’ve confirmed that the blue and green wires cross over from one end to the other.
Attachments:April 29, 2019 at 8:14 pm #98663
Okay, unplug one of the steppers. Get a piece of wire to jump two of the pins on the stepper cable and give the shaft a spin. If it spins freely move one end of the wire to another pin and try again. When it gets hard to spin, that’s a pair. It could be that the steppers just aren’t wired correctly on their cables. I don’t think the crossed center pins is right, but I don’t have that kind of stepper.April 29, 2019 at 8:40 pm #98664
Ok, I got it fixed! The green and blue wires were not supposed to be crossed it turns out. I pulled these out of the plug, flipped them and plugged it all back in and it all works now! Thanks everyone for your help!
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