Positioning The Spindle - Siemens SINUMERIK 840Di Manual

10 NC Start-Up with HMI Advanced
10.5 Axes and spindles
Axis-specific
31, ... 16.2–16.0
31, ... 16.3
31, ... 16.6
31, ... 18.4
31, ... 18.5
Axis-specific
31, ... 82.2–82.0
31, ... 82.3
31, ... 84.7
31, ... 84.6

10.5.25 Positioning the spindle

Functionality
Machine data
Table 10-43 Spindle positioning: Machine data
Axis-specific ($MA_ ...)
35300 SPIND_POSCTRL_VELO
35350 SPIND_POSITIONING_DIR
35210 GEAR_STEP_POSCTRL_ACCEL
10-370
Signals from PLC to axis/spindle
Actual gear stage
Gear switched
No speed monitoring when changing the gear
Oscillation by the PLC
Oscillation speed
Signals from axis/spindle to PLC
Set gear stage
Switch gear
Active spindle mode "Control mode"
Active spindle mode "Oscillation mode"
The NC provides an "oriented spindle stop" function with which the spindle can
be moved into a certain position and held there (e.g. for tool changing pur-
poses). Several programming commands are available for this function which
define the approach and program processing.
References: /PA/ Programming Guide
S1 Spindles
S
To absolute position (0 – 360 degrees)
S
Incremental position (+/– 999999.99 degrees)
S
Block change when position reached
S
Block change on block end criterion.
The control brakes the spindle down to creep speed at the acceleration rate for
speed operation.
If the creep speed has been reached (INT "Spindle in setpoint range"), the con-
trol branches into position control mode and the acceleration rate for position
control mode and the K factor become active.
V
The interface signal "Fine exact stop" is output to indicate that the programmed
position has been reached (block change when position reached).
The acceleration rate for position control mode must be set such that the current
limit is not reached. The acceleration rate must be entered separately for each
gear stage.
If the spindle is positioned from zero speed, it is accelerated up to a maximum
speed corresponding to creep speed; the direction is defined in machine data.
The contour monitoring function is activated as soon as the control mode
switches to position control.
Creep speed
Direction of rotation when positioning from the
standstill
Acceleration in position control mode
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03