SRV-63 series AC servo drives Commissoning
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delay of the response to the position command of the motor speed is decreased.
Gain of the position loop is too low
When we adjust the gain of the position loop to a low value, the motor speed follow-up position
command represents obvious lag and the positioning time is prolonged largely. The high accuracy
and high response performance of the positioning system are seriously affected.
7.2.1 Adjustment of the gain of the position loop
The position control block diagram of the SRV-63 series servo drive is shown in the figure below. The
gain parameters that can be adjusted in the position mode are marked out on the block diagram.
Current
controller
Position
command
P2.10
P2.11
P2.02
P2.07
P1.29
P1.30
P2.04
P1.31
P1.32
P2.03
P1.33
P1.34
P2.09
P2.08
P2.12
P2.13
P2.42
P2.43
P1.23
P1.24
P1.25
P1.26
P1.27
P1.28
P1.19
P1.20
P2.20
P2.22
P2.71
P2.72
P2.73
P2.24
P2.25
P2.23
P2.26
P0.09
P0.10
P0.11
P4.53
P4.51
P4.52
P0.27
P0.28
P0.29
P0.33
P0.34
P1.35
P1.36
P0.25
P0.26
P0.22
P1.37
P1.38
P1.39
P2.70
P2.41
Encoder
Torque limit
Torque filter
Notch filter
Gain
switching
Friction
compensation
Torque
feedforward
Speed
controller
Speed
feedforward
P2.00
P2.01
P1.02
P1.01
P2.06
P2.05
Disturbance
control
Speed
detection
filter
P0.06
P0.07
P0.08
Frequency
division output
Position
command
vibration
control
Position
smoothing filter
Position
controller
Electronic
gear
Motor
The general procedures for parameter adjustment in the position mode are:
1) Initial setting of the parameters
The defaults of the parameters can be recovered by the default parameter recovering operation (see
chapter 5.2.5.3 for details).
2) Adjustment of the gain of the position loop
When the servo motor is running with default parameters, if the system oscillation occurs w ith buzz,
the position gain (P2.02, P2.07) should be adjusted smaller. If the system rigidity is relatively small,
the position gain should be adjusted larger.
3) Adjustment of the position smoothing filter
During position control, if the position pulse commands input frequency varies largely, it may be
caused by a larger impulse. At this time the position smoothing filters time constant(P0.33) or position
command FIR filter (P0.34) should be adjusted to moderate the impulse.
4) Adjustment of the electronic gear
If the pulse transmission frequency of the pulse generator is restricted, or the transmission frequency
does not meet the mechanical requirements, we can change the pulse input frequency by adjusting