December 2001 The Control Loop 6 – 149
6.8.6 Braking the Spindle for an Emergency Stop
Normally, in case of an emergency stop, the axes are braked at the limit of
current. This can create problems:
n With gantry axes a mechanical offset can occur between the master and
slave axes.
n A gear between spindle and motor can be overloaded.
Setting the axis brake ramp for an emergency stop:
7
77
7 Enter as a minimum value in
7
77
7 Use the emergency stop to brake the axis from rapid traverse.
7
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7 Increase the value entered in MP2590.x until the braking time is as short as
possible and the mechanics of the axis are not overloaded.
If the value entered is too small, i.e. if braking is too slow, the axis brakes at
the acceleration defined in MP1060.x.
MP2590.0-8 Braking ramp for axes 1 to 8 or the second spindle in an
emergency stop
Input: 0.1 to 999.9 [rpm/ms]
0: Function inactive
MP2590.x
MP1060.x 60⋅
MP2020.x
--------------------------------------=
Note
The value entered in MP2590.x refers to the motor speed, meaning the
ballscrew pitch is not considered.
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