G540 emergency stop circuits

[tooManyHobbies]

I'm probably making things much more difficult than they need to be, but I gotta ask!

The G540 has a built-in E-Stop input, but on the Gecko Support page there is a document that also accomplishes an emergency stop using a relay and two pushbuttons. http://www.geckodrive.com/upload/Ele...nicalEStop.pdf

My question is, which method is recommended? (Best? Good enough?)
1. Only use the G540 E-Stop input.
2. Use the Electromechanical E-stop and permanently tie the G540 E-Stop input.
3. Use both.

I imagine using both could have an advantage, in that the G540 input will react quicker than the electromechanical method.

Thoughts?

tom

[Crevice Reamer]

Originally Posted by tooManyHobbies I'm probably making things much more difficult than they need to be, but I gotta ask! The G540 has a built-in E-Stop input, but on the Gecko Support page there is a document that also accomplishes an emergency stop using a relay and two pushbuttons. http://www.geckodrive.com/upload/Ele...nicalEStop.pdf My question is, which method is recommended? (Best? Good enough?) 1. Only use the G540 E-Stop input. 2. Use the Electromechanical E-stop and permanently tie the G540 E-Stop input. 3. Use both. I imagine using both could have an advantage, in that the G540 input will react quicker than the electromechanical method. Thoughts? tom

Hi Tom. That circuit is only for Servo motors, and is not needed for steppers. The G540 cannot drive servo motors. Use the G540 Estop wiring.

If you have your machine motor operated by Mach through a relay, then using the Estop will also shut down the spindle motor.

CR.

[tooManyHobbies]

Originally Posted by Crevice Reamer Hi Tom. That circuit is only for Servo motors, and is not needed for steppers. The G540 cannot drive servo motors. Use the G540 Estop wiring. If you have your machine motor operated by Mach through a relay, then using the Estop will also shut down the spindle motor. CR.

I'm trying to find the thread that mentioned using that circuit for steppers too. It's either on this forum or the Benchtop forum. I thought it was Mariss who made the reference, but I could be wrong on all counts!

I'll proceed using only the G540s' Estop. Simpler is better.

Thanks CR.

Tom

[Mariss Freimanis]

The G540 has a very effective built-in E-stop circuit. When activated, it free-wheels (disconnects) all motors, shuts off the relay outputs, forces the PWM analog output to zero VDC, notifies the CNC program and lights the FAULT indicator.

Mariss