Function Manual
168 01/2017
Maximum spindle speed
Maximum spindle speed
A maximum speed is defined for "maximum spindle speed" spindle monitoring, which the spindle may not exceed.
The maximum spindle speed is entered in MD35100 SPIND_VELO_LIMIT.
The control limits an excessive spindle speed setpoint to this value. If the actual spindle speed exceeds the maximum
spindle speed despite allowance for the spindle speed tolerance (MD35150 SPIND_DES_VELO_TOL), there is a drive fault
and IS "Speed limit exceeded" (DB390x.DBX2002.0) is set. Furthermore the alarm 22100 is output and all axes and the
spindle are decelerated.
Minimum/maximum speed for gear stage
Max. speed
MD35130 GEAR_STEP_MAX_VELO_LIMIT defines the maximum speed for the gear stage. In the gear stage engaged, this
set speed can never be exceeded. When the programmed spindle speed is limited, the IS "Set speed limited"
(DB390x.DBX2001.1) is enabled.
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"
(DB390x.DBX2001.2) 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"
Max. encoder limit frequency
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 works reliably again.
In the "positioning mode" spindle mode and with position-controlled threads (G331, G332) the max. encoder limit frequency
is not exceeded.
To Next Page
Loading...
Need help?
General
