Prerequisites For Synchronous Mode - Siemens SINUMERIK 840D Function Manual

$VA_COUP_OFFS[S2] ; actual value position offset approx. 77°
$AA_COUP_CORR[S2] ; correction value = 4°
19.1.3

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).
Further information
S1: Spindles (Page 733)
● The following applies to setpoint couplings (DV):
To ensure more accurate synchronization characteristics, the LS should be in position
control mode (language instruction SPCON) before the coupling is activated.
● Before selecting the synchronous mode, the gear stage necessary for FS and LS must be
selected. In synchronous mode, gear stage changeover and therefore oscillation mode are
not possible for FS and LS. Upon request, an alarm message is generated.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
S3: Synchronous spindle
19.1 Brief description
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