Siemens SINUMERIK 840D Function Manual page 890

S3: Synchronous spindle
19.4 Special features
The acceleration should be constant over the entire speed range for the following spindle.
However, if a knee-shaped acceleration characteristic is also stored in the above-mentioned
machine data for the following spindle, this is only taken into account when the spindles are
coupled in. The setpoints of the following spindle are applied for the specified knee-shaped
acceleration characteristic.
Further information
B2: Acceleration and jerk (Page 347), knee-shaped acceleration characteristic
Actual value coupling
In an actual value coupling (AV), the drive for the FS must be considerably more dynamic than
the leading spindle drive. The individual drives in an actual value coupling are also set optimally
according to their dynamic response.
An actual value coupling should only be used in exceptional cases.
Speed coupling
The velocity coupling (VV) corresponds internally to a setpoint coupling (DV), but with lower
dynamic requirements of the FS and LS. A position control servo loop is not required for the FS
and/or LS. Measuring systems are not required.
Threshold values for coarse/fine synchronism
After controller optimization and feedforward control setting, the threshold values for coarse
and fine synchronism must be entered for the FS.
● Threshold value for "Coarse synchronism"
Axis-spec. MD7200: AV, DV: COUPLE_POS_TOL_COARSE
MD37220: VV: COUPLE_VELO_TOL_COARSE
● Threshold value for "Fine synchronism"
Axis-spec. MD37210: AV, DV: COUPLE_POS_TOL_FINE
MD37230: VV: COUPLE_VELO_TOL_FINE
The values of the FS must be calculated according to the accuracy requirements of the
machine manufacturer, and the PLC interface must be checked via the service display.
Angular offset LS/FS
If there must be a defined angular offset between the FS and LS, e.g. when synchronous
operation is activated, the "zero degree positions" of the FS and LS must be mutually adapted.
This can be done with the following machine data:
● MD34100 $MA_REFP_SET_POS
● MD34080 $MA_REFP_MOVE_DIST
● MD34090 $MA_REFP_ MOVE_DIST_CORR
Further information
R1: Referencing (Page 291)
890
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA