S3: Synchronous spindle
13.1 Brief description
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
711
Setpoint correction
The setpoint correction of the system variable $AA_COUP_CORR[Sn] impacts on all
subsequent following spindle programming in the same way as a position offset and
corresponds to a DRF offset in the MCS.
Example: establish correction value
If a coupling offset of 7° has been programmed using COUPON(....,77) and if a mechanical
offset of 81° has come about as a result of closing the workpiece support fixture, a correction
value of 4° is calculated:
The system variables return the following values for the following spindle:
$P_COUP_OFFS[S2] ; programmed position offset = 77°
$AA_COUP_OFFS[S2] ; setpoint position offset = 77°
$VA_COUP_OFFS[S2] ; actual value position offset approx. 77°
$AA_COUP_CORR[S2] ; correction value = 4°
13.1.3 Prerequisites for synchronous mode
Conditions on selection of synchronous mode
The following conditions must be fulfilled before the synchronous spindle coupling is
activated or else alarm messages will be generated.
● The synchronous spindle coupling must have been defined beforehand (either
permanently configured via machine data or according to user definition via part program
using
COUPDEF).
● The spindles to be coupled must be defined in the NC channel in which the coupling is
activated.
Channel-spec. MD20070 $MC_AXCONF_MACHAX_USED
axis spec. MD35000 $MA_SPIND_ASSIGN_TO_MACHAX
● The following spindle must be assigned to the NC channel in which the coupling is
activated.
Default setting with axis-specific MD30550 AXCONF_ASSIGN_MASTER_CHAN
● The following applies to setpoint and actual value couplings (DV, AV):
FS and LS must at least have a position measuring system for recording positions and
position controls must be started up.
Note
When position control is activated, the maximum setpoint speed of the LS is automatically
limited to 90% (control reserve) of the maximum speed. The limitation is signaled via IS
"Setpoint speed limited" (DB31, ... DBX83.1).
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