Originally Posted by
uli12us
Your Pic seems not to be from any Siemens D control. But I think, if you make a small adjustable hesitation switch in the wire for the break, it will prevent the Z-axis falling down, before the Z-Axis motor get current. If this don't work, you can always build a mechanical solution for this problem, In another machine I have 2 Hydrocylinders with a pressure reservoir that makes so much pressure from bottom, that the Millinghead holds his position, if the motor runs or not. You can this realise with air, but need 15 times the area.