Z-Axis only goes down
Posted: Sat Sep 29, 2018 8:48 pm
Thunderlaser Mini-60, 60W
I've had this machine almost 3 years without one problem until today.
My z-axis stopped moving in the up/positive direction. It goes down/negative just fine. My initial thought was a limit switch was stuck in a closed position...it behaves just like it...the motor will only move in one direction.
- I toggled the switch (S4) no change,
- I replaced the switch no change. (The diagnostics screen shows the Z+ limit switch is on.)
- I can toggle all the other limit switches and they are fine.
- I traced the wire back to the controller: all the connections are tight.
- The common/neg wire at the switch side is grounded.
- There is only 0.75 volts across the positive/red wire to the switch AND at the controller.
- Neither wire is shorted to ground at either end of the wire and there is 4Mohm between them.
- Stepper wires are all connected (power, gnd, step, direction etc.) and solid at the driver and stepper (no loose wires, or shorts.)
These are the obvious (to me) steps to check...I've power cycled the machine multiple times, same outcome...the Z- limit switch stays active.
Any troubleshooting next steps? I couldn't search for similar issues...my keywords are too generic.
thanks in advance for your help
I've had this machine almost 3 years without one problem until today.
My z-axis stopped moving in the up/positive direction. It goes down/negative just fine. My initial thought was a limit switch was stuck in a closed position...it behaves just like it...the motor will only move in one direction.
- I toggled the switch (S4) no change,
- I replaced the switch no change. (The diagnostics screen shows the Z+ limit switch is on.)
- I can toggle all the other limit switches and they are fine.
- I traced the wire back to the controller: all the connections are tight.
- The common/neg wire at the switch side is grounded.
- There is only 0.75 volts across the positive/red wire to the switch AND at the controller.
- Neither wire is shorted to ground at either end of the wire and there is 4Mohm between them.
- Stepper wires are all connected (power, gnd, step, direction etc.) and solid at the driver and stepper (no loose wires, or shorts.)
These are the obvious (to me) steps to check...I've power cycled the machine multiple times, same outcome...the Z- limit switch stays active.
Any troubleshooting next steps? I couldn't search for similar issues...my keywords are too generic.
thanks in advance for your help