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bitraf / bitraf-cnc

CNC-related research and projects at Bitraf
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Requirement: after emergency stop (estop) is activated, a secondary action is required to resume operation #6

Open tingox opened 6 years ago

tingox commented 6 years ago

After emergency stop (estop) is activated, it is not enough to remove the estop signal to resume operation, in addition a secondary action is required (example: press of a reset button).

JensDyvik commented 6 years ago

If we use the same SICK safety hardware as in the fellesverkstedet prototype we will have a nice reset button next to the e-stop that blinks when it should be pressed.

If we keep the existing shopbot control card as a safety card we have an existing reset button.

It is important that the grbl abort pin gets a high signal when the e-stop is pressed. The easiest might be to to keep our existing 5V drop watchdog safety on the HRBL card. The shopbot controll cabinet already have a 5V powersupply.

Currently the shopbot safety bar only pauses the controll. It does not kill power to vfd and drivers via contactors. We need to decide if we should keep a similar configuration or kill power with the bar. If we implement autohome it should not be any trouble to kill power with the safety bars.

In a later stage of this development we should make a proper safety wall ala fellesverkstedet. This has already been discussed and informally approved at bitraf