I am not familiar with the control system you have, but one of the common mistakes made by machine tool builders, especially where you have servo's that are operated in the torque mode with only the loop closed by the encoder to the control, is that often in an e-stop condition, only the main power is removed from the drive power supply and the drive-disable input is not connected.
The result is that in a runaway condition the motors can take off and keep running until the large dc power supply is dissapated. Which does not achieve what the e-stop is supposed to do.
Al
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CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |