Spindle (S1)
20.6 Spindle monitoring
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
361
Minimum speed
MD35140 GEAR_STEP_MIN_VELO_LIMIT defines the minimum speed for the gear stage. It
is not possible that the speed falls below this (set) speed if an S value is programmed, which
is too small. Then, the IS "Setpoint speed increased" (V390x 2001.2) is enabled.
The minimum gear stage speed is operative only in spindle open loop control mode; the
speed of the gear stage can only fall below the minimum limit through:
● Spindle override 0 %
● M5
● S0
● IS "Spindle stop"
● Remove IS "Controller enable"
● IS "Reset"
● IS "Spindle reset"
● IS "Oscillation speed"
● IS "NCSTOP axes and spindle"
● IS "Axis/spindle disable"
20.6.5 Max. encoder limit frequency
WARNING
The maximum encoder limit frequency of the actual spindle position encoder is monitored
by the control (the limit can be exceeded). It is the responsibility of the machine tool
manufacturer to ensure that the configuration of the spindle motor, gearbox, measuring
gearbox, encoder and machine data prevents the maximum speed of the actual spindle
position encoder from being exceeded.
Maximum encoder limit frequency exceeded
If the spindle reaches a speed in the open-loop control mode (a high S value has been
programmed) which is higher than the max. encoder limit frequency (the max. speed of the
encoder may not be exceeded), the synchronization is lost. However, the spindle continues
to rotate.
If one of the thread cutting (G33), revolutional feedrate (G95), constant cutting rate (G96,
G97) functions is programmed, the spindle speed is reduced automatically so far until the
active measuring system is working reliably again.
In the "positioning mode" spindle mode and with position-controlled threads (G331, G332)
the max. encoder limit frequency is not exceeded.
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