S1: Spindles
16.4 Configurable gear adaptation
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1315
Figure 16-7 gear step change with stationary spindle
16.4.8 Gear step change at fixed position
Application and advantages
Machine tools increasingly use standardized spindle drives, firstly to save technological dead time on a gear
stage change and secondly to gain the cost benefits of using standardized components.
The gear stage change at fixed position function supports the "directed gear stage change" of load gearboxes
that need to be activated in a different way than the NC. The gear stage change can in this case only be
performed at a defined spindle position. An oscillation motion as required by conventional load gearboxes is thus
no longer necessary.
Sequence for gear stage change at fixed position
gear stage change at fixed position
Machine data configuration:
MD35010 $MA_GEAR_STEP_CHANGE_ENABLE = 2
runs the following sequence:
• Positioning of the spindle from standstill or movement to the position configured in machine data:
MD35012 $MA_GEAR_STEP_CHANGE_POSITION.
If the gear stage change is performed out of a movement, then the current direction of rotation is maintained.
The spindle is in positioning mode during the positioning action.
NC/PLC IS:
DB31, ... DBX84.5 (positioning mode)
is output.
If no reference is available:
DB31, ... DBX60.4/5 = 0
or NC/PLC IS:
t
1
: With the programming of S1300, NCK detects a new gear step (secondgear step), sets NST
DB31,...DBX82.3 (change gear) and blocks processing for the next part program block (=
internal feed disable*).
t
2
: The spindle is stationary, and oscillation starts (oscillation via the NCK). NST DB31,...DBX18.5
(oscillation speed) must be set at the latest by t
2
.
t
3
: The new gear step is engaged. The PLC user transmits the new (actual) gear step to the NCK
and sets NST DB31,...DBX16.3 (gear is changed).
t
4
: NCK then retracts NST DB31,...DBX82.3 (change gear), ends the oscillation, releases the next
part program block for processing, and accelerates the spindle to the new S value (S1300).
* : The internal feed disable is set if:
• The spindle gear step change has been programmed via the part program and
• A processing block is activated (i.e. G0 is not active)
The internal feed disable is not set during a gear step change from synchronized actions or in
the case of specifications via the PLC with FC18.
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