What might be wrong? Connected #Kossel Board (arduino Mega + Ramps1.4) to #Repetier via iMac.
Only ine Motordriver was on the board so far (and one motor of course) and the extruder heater was attached.
I made connection, which worked fine. When trying to send commands all Home commands resulted in a 1 second vibration of the motor the other motor movements gve no reaction. The extruder heater could not be switched on but when switching on the fan a red LED went on and one of the clamps had voltage so I attached the heater to the fan port - went very hot
But what wight be wrong??? config.h setting looking good …
The motor buzzing is common if the driver current is too low, or the motor is miswired.
Did you have a thermistor plugged into the board for the extruder? If not, the board will not try to power the heater because it does not have feedback for controlling the temp (very dangerous situation).
BTW, NEVER connect a heater to the fan connector, you are likely to blow the FET and have to repair the board…
OK @Jason_Barnett , will try extruder heater with thermistor tomorrow. But I’m not clear with the motor. Why did it buzz when I pressed ANY home button . x, y z or total and did not buzz when I tried to run the motor with the 0.1; 1.0; 10; … mm buttons?
@Karsten_Fuhst , I misunderstood. When you said “send commands all Home commands” I thought you were doing a “Home All” command.
Assuming the electronics and firmware are good, I cannot explain why it would act this way. Homing one axis should not affect any other motor and in this situation, there would not be any difference between a move and home command… except for speed.
Try adjusting the move speed WAY down and see if the motor acts any differently, I doubt it but it is worth a try.
Can you post the output from an M503 command, please. This will show the settings set in firmware.
You might want to try reflashing the firmware on the board to rule that out, too.
some progress… choose another setting in config.h (extr. 1; extr. 2; fan)
attached thermistor to extruder block and connected to board - worked right away but showed me that my self turned brass cooler is not sufficient - will go to aluminum and more and finer ribs…
Motors is next, waiting for connectors.
