Tuning In Manual Mode - Delta ASDA-B3 Series User Manual

Tuning

5.4 Tuning in manual mode

The selection of the position or speed response bandwidth should be determined by the
5
machine stiffness and the application. Generally, for applications or machines that require
high-speed positioning and high precision, higher response bandwidth is required. However,
increasing the response bandwidth might cause mechanical resonance. Thus, machinery with
higher stiffness is used to solve this problem. When the response bandwidth is unknown,
you can gradually increase the gain parameter values to increase the response bandwidth.
Then, decrease the gain parameter values until you hear the sound of the resonance.
The following are the descriptions of the gain adjustment parameters.
 Position control gain (KPP, P2.000)
This parameter determines the response of the position control loop. The bigger the
KPP value, the higher the response bandwidth of the position loop. This lowers the
following error and position error, and shortens the settling time. However, if you set the
value too high, it can cause the machinery to vibrate or cause overshoot when
positioning. The calculation of the position loop response bandwidth is as follows:
 Speed control gain (KVP, P2.004)
This parameter determines the response of the speed control loop. The bigger the KVP
value, the higher the response bandwidth of the speed loop and the lower the following
error. However, if you set the value too high, it can cause mechanical resonance.
The response bandwidth of the speed loop must be 4 to 6 times higher than that of the
position loop. Otherwise, it can cause the machinery to vibrate or cause overshoot
when positioning. The calculation of the speed loop response bandwidth is as follows:
JM: motor inertia; JL: load inertia; P1.037: 0.1 (times)
When P1.037 (auto estimation or manually set value) is equal to the real load inertia
ratio (JL / JM), the real speed loop response bandwidth is:
 Speed integral compensation (KVI, P2.006)
The higher the KVI value, the better the elimination of the deviation. However, if you set
the value too high, it can cause the machinery to vibrate. It is suggested that you set the
value as follows:
5-20
Position loop response bandwidth ( Hz ) =
Speed loop response bandwidth (Hz) = (
Speed loop response bandwidth (Hz) = (
KVI ≤ 1.5 × Speed loop response bandwidth (Hz)
KPP
2π
( 1 + P1.037/10 )
KVP
) × [
2π ( 1 + JL/JM )
KVP
)
2π
ASDA-B3
]