Chapter 6 Control Modes of Operation
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ASDA-A&A+ Series
6-22
Revision April 2009
5: AutoMode (PDFF) [Fix the ratio of Load Inertia to servo motor inertia and response level can
be adjusted]
PI : Proportional - Integral control
PDFF : Pseudo-Derivative Feedback and Feedforward
Explanation of Auto-tuning:
1. When switching mode #2 or #4 to #3 or #5, the system will save the measured load inertia
value automatically and memorized in P1-37. Then, set the corresponding parameters
according to this measured load inertia value.
2. When switching mode #2 or #4 to #0, it indicates all automatically measured load inertia
value will be aborted, and all setting of parameters will be returned to original setting value in
#0 manual mode.
3. When switching mode #0 to #3 or #5, enter the appropriate load inertia value in P1-37.
4. When switching mode #3 to #0, the setting value of P2-00, P2-04 and P2-06 will change to
the value that measured in #3 auto-tuning mode.
5. When switching mode #5 to #0, the setting value of P2-00, P2-04, P2-06, P2-25 and P2-26
will change to the value that measured in #5 auto-tuning mode
Manual Mode
When Tuning Mode Settings of P2-32 is set to 0, the users can define the proportional speed loop gain
(P2-04), speed integral gain (P2-06) feed forward gain (P2-07) and ratio of load inertia to servo motor
Inertia (1-37). Please refer to the following description:
Proportional gain: Adjust this gain can increase the position loop responsiveness.
Integral gain: Adjust this gain can enhance the low-frequency stiffness of speed loop and
eliminate the steady error. Also, reduce the value of phase margin. Over high integral gain will
result in the unstable servo system.
Feed forward gain: Adjust this gain can decrease the phase delay error
Relevant parameters:
P2 - 04
KVP
Proportional Speed Loop Gain
Communication Addr.: 0204H
Default: 500
Related Section:
Applicable Control Mode: ALL
Section 6.3.6
Unit: rad/s
Range: 0 ~ 20000 (ASDA-A series)
0 ~ 4095 (ASDA-A+ series)
Settings:
This parameter is used to set the speed loop gain. When the value of proportional speed loop
gain is increased, it can expedite speed loop response. However, if the setting value is over high,
it may generate vibration or noise.
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deltaacdrives.com