Diagnosis Of Spindle Speed Limitation - Siemens SINUMERIK 840D Function Manual

The minimum gear stage speed is effective only in speed mode and can only be undershot by:
● Spindle override 0%
● M5
● S0
● DB31, ... DBX4.3 (spindle stop)
● DB31, ... DBX2.1 (withdraw controller enable)
● DB21, ... DBX7.7 (reset)
● DB31, ... DBX2.2 (delete distance-to-go / spindle reset)
● DB31, ... DBX18.5 (oscillation speed)
● DB21, ... DBX7.4 (NC stop axes plus spindles)
● DB31, ... DBX1.3 (axis/spindle disable)
● DB31, ... DBX16.7 (delete S value)
Maximum speed
The maximum speed of the gear stage of a spindle is configured in machine data:
MD35130 $MA_GEAR_STEP_MAX_VELO_LIMIT[<n>]
The speed setpoints, generated taking into account the override, are limited to this speed.
The following NC/PLC interface signal is set in the case that the speed is limited:
DB31, ... DBX83.1 (speed setpoint limited)
18.8.5

Diagnosis of spindle speed limitation

System variables
The effective/limiting spindle parameters can be read via the following system variables: The
system variables must be indexed with the spindle number and they return values only relevant
in the speed control and spindle position modes.
System variable
$AC_SMAXVELO[<n>]
$AC_SMAXVELO_INFO[<n>]
$AC_SMINVELO[<n>]
$AC_SMINVELO_INFO[<n>]
$AC_SMAXACC[<n>]
$AC_SMAXACC_INFO[<n>]
$AC_SPIND_STATE[<n>]
<n>: 0, 1, 2, ... maximum spindle number (0: current master spindle of the channel)
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Meaning
Maximum possible spindle speed [RPM].
Identifier for the speed-limiting data element.
Minimum possible spindle speed [RPM].
Identifier for the speed-increasing data element.
Maximum possible spindle acceleration [rev/s
Identifier for the acceleration-limiting data element.
Spindle status in speed-control mode.
S1: Spindles
18.8 Spindle monitoring
].
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