NCK start-up
10.5 Parameterize axis data
CNC Part 1 (NCK, PLC, drive)
126 Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0
Number Identifier Name / remarks Reference
31030 LEADSCREW_PITCH[n] Leadscrew pitch
31040 ENC_IS_DIRECT[n] Encoder is connected directly to the machine
31050 DRIVE_AX_RATIO_DENOM[n] Denominator load gearbox
31060 DRIVE_AX_RATIO_NUMERA[n] Numerator load gearbox
31070 DRIVE_ENC_RATIO_DENOM[n] Measuring gearbox denominator
31080 DRIVE_ENC_RATIO_NUMERA[n] Measuring gearbox numerator
34200 ENC_REFP_MODE[n] Referencing mode
34210 ENC_REFP_STATE[n] Status of absolute value encoder
34220 ENC_ABS_TURNS_MODULO[n] Absolute value encoder range for rotary encoders
(multi-turn resolution)
R2
10.5.3 DSC (Dynamic Servo Control)
The DSC function eliminates the deadtime that necessarily exists at the speed-setpoint
interface normally used between the NCK and drive due to relocation of the position
controller into the drive.
That results in the following advantages for an axis operated with DSC:
• Considerably improved fault response/stability of the position control loop
• Improved command behavior (contour precision) if the loop gain (K
V
factor) that can be
set higher in conjunction with DSC is used.
• A reduction of the cyclic communication load on the PROFIBUS, if the position controller
cycle/PROFIBUS cycle is reduced by adjusting the above parameters, even if the control
loop performance is the same.
Note
The speed feedforward control can be used in conjunction with DSC.
Requirements
Before you can activate DSC mode, the following preconditions must be fulfilled:
• DSC-capable drive
• A DSC-capable message frame type has been parameterized in the S7 project for the
drive.
Switch ON/OFF
The DSC function is switched ON/OFF via the axis-specific NCK machine data
• MD32640 STIFFNESS_CONTROL_ENABLE (dyn. stiffness control).
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