Siemens SINUMERIK 840D sl Function Manual page 918

S3: Synchronous spindle
14.4 Special features of synchronous mode
Following spindle:
MD32810 $MA_EQUIV_SPEEDCTRL_TIME [n] = 3 ms
Time constant of dynamic response adaptation for the following spindle:
MD32910 $MA_DYN_MATCH_TIME [n] = 5 ms - 3 ms = 2 ms
The dynamic response adaptation must be activated axially via MD32900
$MA_DYN_MATCH_ENABLE.
The dynamic adaptation setting can be checked by comparing the following errors of the FS
and LS (in Diagnosis operating area; Service Axes display). Their following errors must be
identical when they are operating at the same speed!
For the purpose of fine tuning, it may be necessary to adjustservo gain factors or
feedforward control parameters slightly to achieve an optimum result.
Control parameter sets
A separate parameter set with servo loop setting is assigned to each gear stage on spindles.
These parameter sets can be used, for example, to adapt the dynamic response of the
leading spindle to the following spindle in synchronous operation.
When the coupling is deactivated (speed or positioning mode), it is therefore possible to
select other position controller parameters for the FS and LS. To utilize this option, a
separate gear stage must be used for synchronous operation and selected before
synchronous mode is activated.
The coupling parameters of the following spindle can be set as follows using this machine
data:
MD30455 $MA_MISC_FUNCTION_MASK
Bit 5=0: Synchronized spindle coupling, following spindle:
Position control, feedforward control and parameter block are set for the following spindle.
Bit5=1: Synchronous spindle coupling:
The control parameters of the following spindle are set as in an uncoupled scenario.
The following control parameters must be set identically for the FS and LS:
● Fine interpolator type (MD33000 $MA_FIPO_TYPE)
● Axial jerk limitation
References:
/FB1/ Function Manual, Basic Functions, Velocities, Setpoint-Actual Value Systems, Closed-
Loop Control (G2)
918
MD32400 $MA_AX_JERK_ENABLE
MD32410 $MA_AX_JERK_TIME
MD32420 $MA_JOG_AND_POS_JERK_ENABLE
MD32430 $MA_JOG_AND_POS_MAX_JERK
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions