AS64 series AC servo drive Commissioning
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7.2.2 Adjusting gains in speed mode
The following block diagram illustrates speed control for AS64 servo drive and lists the adjustable
gain parameters in this control mode.
P0.46
P0.47
P0.48
P0.49
Current
controller
Motor
Speed command
P1.29
P1.30
P2.04
P1.31
P1.32
P2.03
P2.00
P2.01
P1.33
P1.34
P2.09
P2.08
Torque
feedforward
P2.12
P2.13
P0.06
P0.07
P0.08
P2.42
P2.43
P1.23
P1.24
P1.25
P1.26
P1.27
P1.28
P1.19
P1.20
Friction
compensation
Gain
switching
P2.20
P2.27
P2.71
P2.72
P2.73
P2.29
P2.30
P2.28
P0.09
P0.10
P0.11
P0.45
P3.20
P3.21
P0.42
P0.43
P0.50
P0.51
P0.52
P0.53
P4.10
P4.13
P0.54
P0.55
P0.56
P0.57
P0.41
P0.40
P3.22
P4.53
P4.51
P4.52
P2.70
P2.41
P1.02
P1.01
P2.06
P2.05
Speed
command
selection
ACC/DEC
time
Communicat
ion bus
command
Internal
speed
command
Analog
speed
command
Speed
controller
Encoder
Disturbance
control
Frequency
division output
Torque limit
Notch filter
Torque filter
Speed
detection
filter
The common procedure for adjusting parameters in speed mode is as follows:
1. Restore default settings.
For details, see section 5.2.5.3 "Factory parameter restoring".
2. Adjust the speed loop gain.
If the servo motor runs with default settings but the system vibrates with buzzes, you need to decrease
the speed loop gain (that is, P2.00 or P2.05) or increase it when the system rigidity is low or the speed
fluctuates sharply.
3. Adjust the speed integral time constant.
If the speed loop gain is increased, you need to increase the speed integral time constant (that is,
P2.01 or P2.06) as well. Conversely, if the speed loop gain is decreased, you need to decrease the
speed integral time constant as well.
4. Adjust the ACC/DEC time.
If the speed in the starting process changes sharply, huge surges or overcurrent may be caused. You
need to adjust P0.54 [ACC time] to smooth the ramp-up. Similarly, you can adjust P0.55 [DEC time]
to smooth the ramp-down for the stop.
5. Adjust the S-curve ACC/DEC time.
If the speed change cannot be smoothed by adjusting the ACC or DEC time, you can adjust P0.56 [S-
curve ACC time] or P0.57 [S-curve DEC time].
6. Adjust the speed smoothing filter.
If the analog input is a speed command, you can adjust the analog input filter to smooth the speed
change.