Dsc (Dynamic Servo Control) - Siemens SINUMERIK 804D sl Commissioning Manual

NCK start-up
10.5 Parameterize axis data
Number Identifier
31030 LEADSCREW_PITCH[n]
31040 ENC_IS_DIRECT[n]
31050 DRIVE_AX_RATIO_DENOM[n]
31060 DRIVE_AX_RATIO_NUMERA[n]
31070 DRIVE_ENC_RATIO_DENOM[n]
31080 DRIVE_ENC_RATIO_NUMERA[n]
34200 ENC_REFP_MODE[n]
34210 ENC_REFP_STATE[n]
34220 ENC_ABS_TURNS_MODULO[n]
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
• A reduction of the cyclic communication load on the PROFIBUS, if the position controller
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
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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set higher in conjunction with DSC is used.
cycle/PROFIBUS cycle is reduced by adjusting the above parameters, even if the control
loop performance is the same.
drive.
Name / remarks
Leadscrew pitch
Encoder is connected directly to the machine
Denominator load gearbox
Numerator load gearbox
Measuring gearbox denominator
Measuring gearbox numerator
Referencing mode
Status of absolute value encoder
Absolute value encoder range for rotary encoders
(multi-turn resolution)
Commissioning Manual, 11/2006, 6FC5397-2AP10-2BA0
Reference
R2
factor) that can be
V
CNC Part 1 (NCK, PLC, drive)