Servo Gain Factor Kv Nc Md - Siemens SINUMERIK 840C Installation Instructions Manual

10 Axis and Spindle Installation
10.4.1 Drive optimization
10.4.1.3 Servo gain factor K
To achieve only negligible contour deviations with continuous path control, a high K
gain) factor (NC MD 252*) is required.
If the K factor is too high, however, instability, overshoots and possibly excessive machine
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loads result.
The maximum permissible K
• the drive configuration
(rise time, acceleration and braking ability).
• the quality of the machine
The K factor is defined as
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Speed
K =
V
Following error
m/min
mm
If an empirical value for the K
overshooting or instability.
Good speed controller optimization is a precondition for
K factor adjustment
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Reduce the acceleration (NC MD 276*). The overshoot behaviour is decisive for evaluating the
maximum K factor. The acceleration must therefore be set at an accordingly low level to
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ensure that the drive remains below its current threshold.
If the drive is intended to have acceleration of 1 m/s
to one-half of the value
10–24
NC MD 252*
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factor depends on:
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[m/min]
[mm]
is the unit of the K
V
factor is known for the machine, set this value and check for
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a correct K factor setting.
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2 , adopt a cautious approach and reduce
2
0.5 m/s ˆ = input 50
© Siemens AG 1992 All Rights Reserved
factor according to VDI standard
6FC5197- AA50
SINUMERIK 840C (IA)
12.93
(servo
V