Siemens SINUMERIK 840D Function Manual page 887

● The gear stage(s) of FS and LS for synchronous operation
● The following coupling properties are still applicable for permanently configured
synchronous spindle coupling:
– Block change response in synchronous spindle operation:
– Coupling cancellation response:
– Write-protection for coupling parameters:
– Transformation parameters for synchronous spindle coupling:
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 adapt different
axis dynamic responses without loss of control quality (see also Function Manual "Monitoring
and Compensating", Section "K3: Compensations"). The following control parameters must
each be set optimally for the FS and LS:
● K
● Feedforward control parameters
MD32620 $MA_FFW_MODE
MD32610 $MA_VELO_FFW_WEIGHT
MD32650 $MA_AX_INERTIA
MD32800 $MA_EQUIV_CURRCTRL_TIME
MD32810 $MA_EQUIV_SPEEDCTRL_TIME
Behavior during loss of synchronism:
● Axis-specific MD32620 $MA_FFW_MODE
We recommend setting the feedforward control mode of the following axis to speed
feedforward control with Tt balancing MD32620 = 3.
This feedforward control mode can be further optimized for a more secure balancing process
by changing the axis-specific machine data:
Machine data
MD32810 EQUIV_SPEEDCTRL_TIME
MD37200 COUPLE_POS_TOL_COURSE
MD37210 COUPLE_POS_TOL_FINE
MD37220 COUPLE_VELO_TOL_COURSE
MD37220 COUPLE_VELO_TOL_FINE
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
MD21320 $MC_COUPLE_BLOCK_CHANGE_CTRL_1
MD21330 $MC_COUPLE_RESET_MODE_1
MD21340 $MC_COUPLE_IS_WRITE_PROT_1
SD42300 $SC_COUPLE_RATIO_1[n]
factor (MD32200 $MA_POSCTRL_GAIN)
V
S3: Synchronous spindle
Meaning
Equivalent time constant speed control loop for
feedforward control
Threshold value for "Coarse synchronism"
Threshold value for "Fine synchronism"
Velocity tolerance 'coarse'
Velocity tolerance 'fine'
19.4 Special features
887