Siemens SINUMERIK 828D Function Manual page 1343

S1: Spindles
16.8 Spindle monitoring
Spindle setpoint speed
The spindle setpoint speed is derived from the programmed speed taking into account the spindle correction and
the active limits.
If the programmed speed is limited or increased, this is displayed using DB31, ... DBX83.1 (setpoint speed
limited) or DB31, ... DBX83.2 (setpoint speed increased) (see also "Minimum / maximum speed of the gear stage
[Page 1344]"). The means that reaching the tolerance range of the setpoint speed is not prevented.
Tolerance range for setpoint speed
The tolerance range of the setpoint speed is defined by the spindle speed tolerance factor:
MD35150 $MA_SPIND_DES_VELO_TOL
Example:
MD35150 $MA_SPIND_DES_VELO_TOL = 0.1
⇒ The spindle actual speed may deviate ±10% from the setpoint speed.
The following NC/PLC interface signal is set to "1" if the spindle actual speed lies within the tolerance range:
DB31, ... DBX83.5 (spindle in setpoint range) = 1
Special case:
If the spindle speed tolerance is set to "0", then DB31, ... DBX83.5 (spindle in the 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 exited, e.g. due to an overload, the path movement is not automatically brought to
a standstill.
Basic Functions
1343
Function Manual, 09/2011, 6FC5397-0BP40-2BA0