Siemens SINUMERIK 840D sl Function Manual page 902

Synchronous Spindles (S3)
14.4 Special features of synchronous mode
● The following coupling properties are still applicable for permanently configured
Command behavior of FS and LS for setpoint coupling
In order to obtain the best possible synchronism in setpoint couplings , the FS and LS must
have the same dynamic response as the response to setpoint changes. The axial control
loops (position, speed and current controllers) should each be set to the optimum value so
that variances can be eliminated as quickly and efficiently as possible.
The dynamic response adaptation function in the setpoint branch is provided to allow
differing dynamic responses of axes to be matched without loss of control quality. The
following control parameters must each be set optimally for the FS and LS:
● K
● Feedforward control parameters
References:
/FB2/ Function Manual, Extended Functions; Compensations (K3)
Behavior during loss of synchronism:
● axis-specific MD32620 $MA_FFW_MODE
We would recommend setting the feedforward control mode of the following axis to speed
feedforward control with Tt symmetrization MD32620 = 3.
902
synchronous spindle coupling:
– Block change response in synchronous spindle operation:
MD21320 $MC_COUPLE_BLOCK_CHANGE_CTRL_1
– Coupling cancellation response:
MD21330 $MC_COUPLE_RESET_MODE_1
– Write-protection for coupling parameters:
MD21340 $MC_COUPLE_IS_WRITE_PROT_1
– Translation parameters for synchronized spindle coupling:
SD42300 $SC_COUPLE_RATIO_1[n]
factor (MD32200 $MA_POSCTRL_GAIN)
V
MD32620 $MA_FFW_MODE
MD32610 $MA_VELO_FFW_WEIGHT
MD32650 $MA_AX_INERTIA
MD32800 $MA_EQUIV_CURRCTRL_TIME
MD32810 $MA_EQUIV_SPEEDCTRL_TIME
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions