S3: Synchronous spindle
13.4 Points to note
Extended Functions
744 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
● The required coupling mode (setpoint, actual value or speed coupling)
(for permanently configured coupling with channel-specific machine data
MD21310 $MC_COUPLING_MODE_1[n])
● 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:
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
– Transformation parameters for synchronous spindle coupling:
SD42300 $SC_COUPLE_RATIO_1[n]
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 Section "K3:
Comp
ensations (Page 223)"). The following control paramete
rs must each be set optimally
for the FS and LS:
● K
V
factor (MD32200 $MA_POSCTRL_GAIN)
● 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 symmetrization MD32620 = 3.
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