Siemens SINUMERIK 828D Function Manual page 1287

Position measurement systems, spindle
The spindle can be switched from spindle mode to axis mode (rotary axis) if a single motor is used for spindle
mode and axis mode.
The spindle (spindle mode and axis mode) can be equipped with one or two position measurement systems.
With two position measurement systems, it is possible to assign one position measurement system to the spindle
and the other to the rotary axis, or to assign two position measurement systems to the spindle. Where two
position measurement systems are provided, both are updated by the control, but only one can be active.
The active position measuring system is selected using the NC/PLC interface signal:
DB31, ... DBX1.5 (position measuring system 1)
or
DB31, ... DBX1.6 (position measuring system 2)
The active position measurement system is required for the following functions:
• Position control of the spindle (SPCON)
• Spindle positioning (SPOS, M19 and SPOSA)
• Thread cutting (G33, G34, G35)
• Tapping without compensating chuck (G331, G332)
• Revolutional feedrate (G95)
• Constant cutting rate (G96, G961, G97, G971)
• Spindle actual speed display
• Axis mode
• Synchronous spindle setpoint value linkage.
Resynchronizing the position measuring system for the spindle
In the following cases, the spindle position measurement system must be resynchronized:
• The position encoder is on the motor, a Bero proximity switch is mounted on the spindle and a gear stage
change is performed. Synchronization is triggered internally once the spindle is rotating in the new gear stage
(see Synchronization procedure).
• The machine has a selector switch for a vertical and horizontal spindle. Two different position encoders are
used (one for the vertical spindle and one for the horizontal spindle), but only one actual value input is used on
the control. When the system switches from the vertical to the horizontal spindle, the spindle must be
resynchronized.
This synchronization is initiated with the NC/PLC interface signal:
DB31, ... DBX16.4 (resynchronize spindle 1)
or
DB31, ... DBX16.5 (resynchronize spindle 2)
The spindle must be in open-loop control mode.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
S1: Spindles
16.3 Reference / synchronize
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