Machsupport Forum

Third party software and hardware support forums. => Third party software and hardware support forums. => Topic started by: Jonr7 on April 11, 2019, 01:00:50 PM

Title: cnc 24 v dc power supply failure short out
Post by: Jonr7 on April 11, 2019, 01:00:50 PM

I have 24 volt dc output switching power supply to power my (diy router) cnc electronics, stepper motors, ect.
The power supply shorted out two of the transistors on the circuit board. I have since replaced the power supply and now my limit switches will not activate in Mach 3 program. Checked all the switches,wiring and settings in Mach 3 configuration ports and pins. When I open Mach 3, the reset button is flashing, Emergency mode Active, Status says: Driver Successfully installed. Open Diagnostics and all my limit switch boxes are yellow. When I hit the re-set button, the message clears. I hit my limit switches and they do not activate emergency stop. Also, ref-all-home will not work, machine will not travel to home position. The stepper motors work.
Has the power supply damaged my Mach 3 program or computer? I don't know what else to do....

Thanks

Jon Rodriguez

Title: Re: cnc 24 v dc power supply failure short out
Post by: reuelt on April 20, 2019, 10:37:11 AM

Quote from: Jonr7 on April 11, 2019, 01:00:50 PM

I have 24 volt dc output switching power supply to power my (diy router) cnc electronics, stepper motors, ect.
The power supply shorted out two of the transistors on the circuit board. I have since replaced the power supply and now my limit switches will not activate in Mach 3 program. Checked all the switches,wiring and settings in Mach 3 configuration ports and pins. When I open Mach 3, the reset button is flashing, Emergency mode Active, Status says: Driver Successfully installed. Open Diagnostics and all my limit switch boxes are yellow. When I hit the re-set button, the message clears. I hit my limit switches and they do not activate emergency stop. Also, ref-all-home will not work, machine will not travel to home position. The stepper motors work.
Has the power supply damaged my Mach 3 program or computer? I don't know what else to do....

Thanks

Jon Rodriguez

I think, the negative terminal of the 24V PSU should ALSO be connected to the common ground of the limit switches connections at the Break out Board (BOB).
What BOB are you using?
If that still does not fix it, you may need to replace the BOB.