Siemens SINUMERIK 840Di Function Manual page 1582

Detailed Description
2.6 Spindle monitoring
If the actual speed deviates from machine data:
MD35150 $MA_SPIND_DES_VELO_TOL
by more than the spindle speed tolerance:
• Axial NC/PLC IS:
• The next machining block is not enabled.
• Machine data:
Tolerance range for setpoint speed
MD35150 $MA_SPIND_DES_VELO_TOL = 0.1
The spindle actual speed may deviate +/- 10% from the setpoint speed.
The spindle setpoint speed is derived from the programmed speed taking the current limits
into account.
Any limitation or increase of the programmed speed
is indicated either by axial NC/PLC IS:
DB31, ... DBX83.1 (set speed limited)
or
DB31, ... DBX83.2 S (set speed increased)
and does not prevent the axis reaching the speed tolerance range.
If the spindle lies inside the tolerance range,
axial NC/PLC IS:
DB31, ... DBX83.5 (spindle in setpoint range)
is set to 1 at the VDI interface.
Special case:
If the speed tolerance is set to 0, axial NC/PLC IS:
DB31, ... DBX83.5 (spindle in setpoint range)
is permanently set to 1 and no path control is performed.
Speed change
Path control only takes place at the start of the traverse block and only if a speed change
has been programmed. If the speed tolerance range is violated, e.g., due to an overload, the
path movement is not automatically brought to a standstill.
2-78
DB31, ... DBX83.5 (spindle in setpoint range)
is set to 0.
MD35500 $MA_SPIND_ON_SPEED_AT_IPO_START
is set to 1.
Exception:
MD35500 $MA_SPIND_ON_SPEED_AT_IPO_START = 0
Path interpolation is not influenced, the traveled path axis is not stopped.
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Spindles (S1)