Delta Electronics ASDA-B Series - Manual (Page 113)

Chapter 5 Trial Run and Tuning Procedure|ASDA-B Series
5-20 Revision January 2009
5.5.7 Gain Adjustment in Manual Mode
The position and speed responsiveness selection is depending on and determined by the the control
stiffness of machinery and conditions of applications. Generally, high reponsiveness is essential for the
high frequency positioning control of mechanical facilities and the applications of high precision process
system. However, the higher responsiveness may easily result in the resonance of machinery system.
Therefore, for the applications of high responsiveness, the machinery system with control stiffness is
needed to avoid the resonance. Especially when adjusting the responsiveness of unfamiliar machinery
system, the users can gradually increase the gain setting value to improve responsiveness untill the
resonance occurs, and then decrease the gain setting value. The relevant parameters and gain
adjusting methods are described as follows:
„ KPP, Parameter P2-00 Proportional Position Loop Gain
This parameter is used to determine the responsiveness of position loop (position loop gain). It
could be used to increase stiffness, expedite position loop response and reduce position error.
When the setting value of KPP is higher, the response to the position command is quicker, the
position error is less and the settling time is also shorter. However, if the setting value is over high,
the machinery system may generate vibration or noise, or even overshoot during positioning. The
position loop responsiveness is calculated as follows:
Position Loop Responsiveness (Hz)= KPP
2
„ KVP, Parameter P2-04 Proportional Speed Loop Gain
This parameter is used to determine the responsiveness of speed loop (speed loop gain). It could
be used to expedite speed loop response. When the setting value of KVP is higher, the response
to the speed command is quicker. However, if the setting value is over high, it may result in the
resonance of machinery system. The responsiveness of speed loop must be higher than the 4~6
times of the responsiveness of position loop. If responsiveness of position loop is higher than the
responsiveness of speed loop, the machinery system may generate vibration or noise, or even
overshoot during positioning. The speed loop responsiveness is calculated as follows:
Spee d Loop Responsiveness v( Hz) = f
KVP
2
(1 + P1-37 / 10)
(1 + (J L / J M))
x 2 ( ) x [ ]
JM: Motor inertia
JL: Load inertia
P1-37: 0.1 times
„ KVI, Parameter P2-06 Speed Integral Compensation
If the setting value of KVI is higher, the capability of decreasing the speed control deviation is
better. However, if the setting value is over high, it may easily result in the vibration of machinery
system. The recommended setting value is as follows:
KVI (Parameter P2-06) 1.5 x Speed Loop Responsiveness