Siemens SINUMERIK 840D sl Function Manual page 1258

S1: Spindles
16.4 Configurable gear adaptation
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 $MA_GEAR_STEP_CHANGE_POSITION.
If the gear stage change is performed out of a movement, then the current direction of
rotation is maintained. The spindle is in positioning mode during the positioning action.
NC/PLC IS:
DB31, ... DBX84.5 (positioning mode)
is output.
If no reference is available:
DB31, ... DBX60.4/5 = 0
or NC/PLC IS:
DB31, ... DBX17.4/5 (resynchronize on positioning MS 1/2)
is set, the positioning action is extended by the time it takes to find the zero mark.
● After reaching the gear stage change position configured in machine data:
MD35012$MA_GEAR_STEP_CHANGE_POSITION
the machine waits for the time in machine data:
MD35310 $MA_SPIND_POSIT_DELAY_TIME
before switching to oscillation mode,
and the known gear stage change dialog starts.
● Output of NC/PLC interface signals:
DB31, ... DBX84.6 (oscillation mode)
DB31, ... DBX82.3 (change gear)
DB31, ... DBX82.0-82.2 (set gear stage A to C).
● Position control is not disabled when an active measuring system with indirect encoder
(motor encoder) is used:
MD31040 $MA_ENC_IS_DIRECT = 0
If a measuring system with a direct encoder (load encoder) is active, position control is
deactivated:
DB31, ... DBX61.5 = 0,
because the induction flux to the load is interrupted and closed-loop position control is no
longer possible.
● If position-controlled operation is not possible, it can be disabled by
resetting "Controller enable":
DB31, ... DBX2.1 = 0
.
● Mechanical switchover of the gear stage on the machine.
No oscillation movement is required from the drive.
NC/PLC IS:
DB31, ... DBX18.5 (oscillation enable)
and
DB31, ... DBX18.4 (oscillation via PLC)
should not be set.
In principle, oscillation movement is still possible at this point.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions