Siemens SINUMERIK 840D sl Function Manual page 876

S3: Synchronous spindle
14.1 Brief description
Synchronous mode
Synchronous mode (also referred to as "Synchronous spindle operation") is another spindle
operating mode. Before synchronous mode is activated, the following (slave) spindle must
have been switched to position control. Synchronous operation is activated for the following
spindle when the coupling is activated. As soon as the coupling is deactivated, the following
spindle switches to back to open-loop control mode.
As soon as synchronous operation is active for the following spindle, the following interface
signal is reported to the PLC:
IS "Synchronous mode" (DB31, ... DBX84.4) = 1.
Number of synchronous spindles
It is possible to couple several following spindles to one leading spindle. The number of
following spindles on this leading spindle depends on the respective versions of the
appropriate software versions.
Any number of following spindles in any channels of one NCU or a different NCU can be
coupled to this leading spindle.
Note that one spindle is always the master and the number of couplings results from the
number of axes less the master.
Options in synchronous mode
The following functions are available for synchronous mode:
● FS and LS turn at the same speed
● Rotation in the same or opposite direction between LS and FS
● Following and leading spindles rotate at different speeds
● Settable angular position between FS and LS (φ
● Activation of synchronous operation between LS and FS can take place when the
● The full functionality of the open-loop and position control modes is available for the
● When synchronous mode is not active, the FS and LS can be operated in all other
● The speed ratio can also be altered when the spindles are in motion in active
● With synchronous spindle coupling switched on, the offset of the FS to the LS (overlaid
876
(n = n ; speed ratio k
FS LS
(can be defined positively or negatively using speed ratio k
(n = k · n ; speed ratio k
FS Ü LS
Application: Polygonal turning
The spindles run at synchronous speed with a defined angular offset between FS and LS
(position synchronous coupling).
Application: Shaped workpieces
spindles are in motion or at standstill.
leading spindle.
spindle modes.
synchronous mode.
movement) can be altered.
= 1)
Ü
≠ 1)
Ü
)
Ü
= φ + Δφ)
FS LS
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions