Siemens SINUMERIK 828D Function Manual page 1311

Special points to be noted
Setting/Resetting the NC/PLC IS and machine data in oscillation mode:
• To decelerate the spindle, the PLC user need not set NC/PLC IS:
DB31, ... DBX4.3 (Spindle stop)
.
The spindle is brought to a standstill internally by the control when a gear step change is requested.
• The gear step change should always be terminated with NC/PLC IS:
DB31, ... DBX16.3 (Gear changed)
.
• NC/PLC IS:
DB31, ... DBX18.5 (Oscillation speed)
should be used to support mechanical engagement of the gear.
It has no effect on the internal control mechanism for the gear step change procedure and should therefore
only be set as necessary.
• If NC/PLC IS:
DB31, ... DBX18.5 (Oscillation speed)
is reset, oscillation mode stops.
However, the spindle remains in "oscillation mode".
• The acceleration is defined in the following machine data:
MD35410 $MA_SPIND_OSCILL_ACCEL
• The spindle will cease to be synchronized if an indirect measuring system (motor encoder) is used.
If the machine data is set to:
MD31050 $MA_ENC_IS_DIRECT = 0,
NC/PLC IS:
DB31, ... DBX60.4/5 = 0 (Homed/Synchronized)
is automatically deleted.
The zero mark is synchronized the next time it is crossed.
End of oscillation mode
On termination of oscillation mode, the spindle returns to open­loop control mode and automatically changes to
the mode defined by SPCON or SPCOF.
All gear­specific limit values (min./max. speed, etc.) correspond to the set values of the actual gear step.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
S1: Spindles
16.4 Configurable gear adaptation
1311