YASKAWA SGDS Sigma III Series, User Manual

Page: 235 / 376

8 Adjustments
8.1.2 List of Servo Adjustment Functions
8-6
(3) Vibration Reduction Functions
Function Name and
Related Parameters
Description Features Valid
Control
Modes
Refer-
ence
Section
Soft Start
Pn305
Pn306
Converts a stepwise speed reference to a
constant acceleration or deceleration for
the specified time interval. A constant acceleration/deceleration is
achieved for smoother operation.
The operation time is delayed by the set
time. Speed
−
Acceleration/
Deceleration Filters
Pn810
Pn811
A 1st-order delay filter for the position
reference input. Enables smooth operation.
The reference time increases by the filter
delay time even after the reference input
has been completed. Position
−
Movement Average
Filter
Pn812
A movement averaging filter for the
position reference input. Enables smooth operation.
The reference time increases by the filter
delay time even after the reference input
has been completed. Position
−
Speed Feedback
Filter
Pn308
A standard 1st-order delay filter for the
speed feedback. The feedback speed is smoother.
The response is delayed if a larger value
is set. Position
Speed
8.6.4
Torque Reference
Filters
Pn401
Pn40F to Pn414
A series of three filter time constants, 1st-
order, 2nd-order, and 1st-order, can be set
in order for the torque reference. These filters are effective in essentially
all frequency bands.
The response is delayed if a larger value
(low frequency) is set. Position
Speed
Torque
8.6.9
Vibration
Suppression
on Stopping
Pn420
Pn421
A damping coefficient is applied to the
change in the torque reference when
stopping. The variation in the torque is decreased
when stopping.
Disturbance characteristics are decreased. Position
8.6.10
Notch Filters
Pn408 to Pn40D
A series of two notch filters can be set for
the torque reference. A notch width is
possible for each. Mainly effective for vibration between
500 and 2,000 Hz. Instability will result if
the setting is not correct. As a utility
function for the notch filters settings, for
frequency characteristics, there is a
Online Vibration Monitor (Fn018) and
EasyFFT (Fn019). Position
Speed
Torque
8.6.9