Siemens SINUMERIK 828D Function Manual page 1318

S1: Spindles
16.4 Configurable gear adaptation
t : With the programming of S1300, NCK detects a new gear stage (second gear stage), NCK sets
1
NST DB31, ... DBX84.5 (positioning mode) and blocks processing for the next part program
block (= internal feed disable*).
t : The spindle is stationary, and exact stop is signaled.
2
t : Gear stage change - wait time
3
t : The new gear stage is engaged. The PLC user transmits the new (actual) gear stage to the NCK
4
and sets NST DB31, ... DBX16.3 (gear is changed).
t : NCK then retracts NST DB31, ... DBX82.3 (change gear), releases the next part program block
5
for processing, and accelerates the spindle to the new S value (S1300).
* : The internal feed disable is set if:
• The spindle gear stage 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 stage change from synchronized actions or in
the case of specifications via the PLC with FC 18.
Figure 16-8 Gear stage change with stationary spindle
gear stage change position MD35012
The gear stage change position is defined in machine data:
MD35012 $MA_GEAR_STEP_CHANGE_POSITION
for each gear stage.
gear stage change wait time MD35310
After the positioning action the machine waits for the time configured in machine data:
MD35310 $MA_SPIND_POSIT_DELAY_TIME
until gear change request:
DB31, ... DBX84.6 (Oscillation mode)
DB31, ... DBX82.3 (Change gear)
and
DB31, ... DBX82.0-82.2 (Set gear stage A to C)
are output.
Position identifiers/position
The position is always approached via the shortest path (corresponds to DC).
If no reference is available and the spindle is in stillstand
(e.g. after Power On), then the direction of travel is determined by the following machine data:
MD35350 $MA_SPIND_POSITIONING_DIR
If an adjustable gear stage change position is required, then this can be achieved by writing the machine data
and by a subsequent NewConfig.
The change of the MD value can be achieved by the part program or HMI.
If the system is unable to reach the preset position, then alarm 22020 is signaled and the gear stage change
dialog between NCK and PLC does not take place in order not to destroy the gears. As this alarm is serious, the
part program cannot continue and the cause must be eliminated under all circumstances Experience has shown
that the abortion of positioning is usually due to incorrect MD settings or incompatible PLC signals.
1318
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions