Detailed Description
2.1 Spindle modes
Spindles (S1)
2-6 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Spindle behavior with G96, G961
Constant cutting rate
• At the start of machining (transition from G0 to Gx) and after NC stop, G60 (exact stop,
modal) and G09 (exact stop, non-modal) the system waits until the actual speed has
reached the speed setpoint tolerance range before starting the path.
NC/PLC IS:
DB31, ... DBX83.5 (nAct = nSet)
is then set.
• NC PLC IS:
DB31, ... DBX83.5 (nAct = nSet)
and
DB31, ... DBX83.1 (setpoint speed limited)
are also set to defined values even if severe speed changes are specified
(transverse axis travels towards position 0).
• If the speed drops below the minimum speed
or when NC/PLC IS:
DB31, ... DBX61.4 (axle/spindle stationary)
is detected, NC/PLC IS:
DB31, ... DBX83.5 (nAct = nSet)
is reset (e.g., for an emergency machine strategy).
• A path operation, which has started (G64, rounding), is not interrupted.
Machine data:
MD35500 $MA_SPIND_ON_SPEED_AT_IPO_START
can also influence spindle behavior significantly.
Spindle behavior at the end of gear step change
End of gear step change
• NC/PLC IS:
DB31, ... DBX16.3 (gear changed)
tells the NC that the new gear step
(NC/PLC IS DB31, ... DBX16.0-16.2 (actual gear step A to C))
applies and oscillation mode is terminated.
In this case, it does not matter whether NC/PLC IS:
DB31, ... DBX18.5 (oscillation mode)
is still set.
The actual gear step should correspond to the set gear step.
The actual gear step signaled is relevant for selection of the parameter set.
• Once the gear step change (GSW) has been acknowledged via the PLC (DB31, ...
DBX16.3), the spindle is in speed control mode (DB31, ... DBX84.7 = 1).
If a direction of rotation (M3, M4, M5 or FC18: "Start spindle rotation") or a spindle speed
(S value) was programmed before the gear step change, then the last speed and
direction of rotation will be reactivated after the gear step change.
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