Minimum / Maximum Speed Of The Gear Stage - Siemens SINUMERIK 840D Function Manual

S1: Spindles
18.8 Spindle monitoring
Spindle setpoint speed
The spindle speed setpoint is derived from the programmed speed taking into account the
spindle override and the active limits.
If the programmed speed is limited or increased, this is displayed using DB31, ... DBX83.1
(speed setpoint limited) or DB31, ... DBX83.2 (speed setpoint increased) (see also "Minimum /
maximum speed of the gear stage (Page 828)"). 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.
18.8.4

Minimum / maximum speed of the gear stage

Minimum speed
The minimum speed of the gear stage of a spindle is configured in the machine data:
MD35140 $MA_GEAR_STEP_MIN_VELO_LIMIT[<n>]
The speed setpoints, generated taking into account the override, do not fall below the minimum
speed.
If an S value is programmed, which is less than the minimum speed, the setpoint speed is
increased to the minimum speed and the following NC/PLC interface signal is set:
DB31, ... DBX83.2 (speed setpoint increased)
828
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA