Siemens SINUMERIK 840Di Function Manual page 1534

Detailed Description
2.3 Configurable gear adaptation
The active position measurement system is required for the following functions:
• Position control of the spindle (SPCON)
• Spindle positioning (SPOS, M19 and SPOSA)
• Thread cutting (G33, G34, G35)
• Tapping without compensating chuck (G331, G332)
• Revolutional feedrate (G95)
• Constant cutting rate (G96, G961, G97, G971)
• Spindle actual speed display
• Axis mode
• Synchronous spindle setpoint value linkage
NC/PLC IS DB31, ... DBX16.4 (Resynchronize spindle)
In the following cases, the spindle position measurement system must be resynchronized:
• The position encoder is on the motor, a Bero proximity switch is mounted on the spindle
• The machine has a selector switch for a vertical and horizontal spindle. Two different
2.3 Configurable gear adaptation
2.3
2.3.1 Gear steps for spindles and gear step change
Why do we need gear steps?
Gear steps are used on spindles to step down the speed of revolution of the motor in order
to generate a high torque at low spindle speeds or to step up in order to maintain a high
speed.
2-30
and a gear step change is performed. Synchronization is triggered internally once the
spindle is rotating in the new gear step (see Synchronization procedure).
position encoders are used (one for the vertical spindle and one for the horizontal
spindle), but only one actual-value input is used on the control. When the system
switches from the vertical to the horizontal spindle, the spindle must be resynchronized.
This synchronization action is triggered with NC/PLC IS:
DB31, ... DBX16.4 (resynchronize spindle 1)
or
DB31, ... DBX16.5 (resynchronize spindle 2).
The spindle must be in open-loop control mode.
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Spindles (S1)