Siemens SINUMERIK 840D sl Function Manual page 920

S3: Synchronous spindle
14.4 Special features of synchronous mode
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"
● Threshold value for "Fine synchronism"
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
References:
/FB1/ Function Manual, Basic Functions, Reference Point Approach (R1)
Service display for FS
The following values are displayed for the following spindle for start-up in synchronous
operation in the "Service Values Axes" display in the "Diagnosis" operating area:
● Actual deviation between setpoints of FS and LS
● Actual deviation between actual values of FS and LS
References:
/BAD, BEM/ HMI Advanced/Embedded, Service display, Section "Service drive"
920
Axis-specific MD7200: AV, DV: COUPLE_POS_TOL_COARSE
MD37220: VV: COUPLE_VELO_TOL_COARSE
Axis-specific MD37210: AV, DV: COUPLE_POS_TOL_FINE
MD37230: VV: COUPLE_VELO_TOL_FINE
Value displayed: Position offset in relation to leading spindle (setpoint)
(value corresponds to angular offset between FS and LS that can be read with axis
variable $AA_COUP_OFFS in the parts program)
Value displayed: Position offset in relation to leading spindle (actual value)
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions