Prerequisites For Synchronous Mode - Siemens SINUMERIK 840D sl Function Manual

14.1.4

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
● The spindles to be coupled must be defined in the NC channel in which the coupling is
● The following spindle must be assigned to the NC channel in which the coupling is
● The following applies to setpoint and actual value couplings (DV, AV):
References:
/FB1/ Function Manual, Basic Functions; Spindles (S1)
● The following applies to setpoint couplings (DV):
● Before selecting the synchronous mode, the gear stage necessary for FS and LS must be
Cross-channel coupling
The LS can be located in any channel.
● The LS can be exchanged between channels by means of "Axis exchange".
● When several following spindles are coupled to one leading spindle, the dynamic
● The following spindle is always located in the channel in which the coupling has been
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
permanently configured via machine data or according to user definition via parts
program using COUPDEF).
activated.
Channel-spec. MD20070 $MC_AXCONF_MACHAX_USED
axis spec. MD35000 $MA_SPIND_ASSIGN_TO_MACHAX
activated.
Default setting with axis-specific MD30550 AXCONF_ASSIGN_MASTER_CHAN
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).
To ensure more accurate synchronization characteristics, the LS should be in position
control mode (language instruction SPCON) before the coupling is activated.
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.
response of the coupling is determined by the weakest response as a function of the
coupling factor. The acceleration rate and maximum speed are reduced for the leading
spindle to such a degree that none of the coupled following spindles can be overloaded.
activated using COUPON or COUPONC.
Synchronous Spindles (S3)
14.1 Brief description
869