Using The Smoothing Function; Adjusting Gain - YASKAWA SGM series User Manual

APPLICATIONS OF Σ-SERIES PRODUCTS

3.5.3 Adjusting Gain

3.5.2 Using the Smoothing Function

SGDA-
Positions
3
3.5.3 Adjusting Gain
112
1) The smoothing function adjusts constant-frequency reference input inside the Servo-
P
pack so that acceleration and deceleration can be as constant as possible. To use this
function, set the following user constant.
ACCTME
Cn-26
This user constant is used for position control
(SGDA-jjjP) only.
This function performs acceleration/deceleration
processing for input reference pulses (primary lag
characteristics).
This function prevents the motor from running at
progressive speeds in the following cases:
• When the host controller which outputs refer-
ences cannot perform acceleration/decelera-
tion processing
• When reference pulse frequency is too low
• When reference electronic gear ratio is too high (more than 10 times)
This function does not change the travel distance (number of pulses).
1) If speed loop gain or position loop gain exceeds the allowable limit for the servo system
including the machine to be controlled, the system will vibrate or become too susceptible.
Under such conditions, smooth operation cannot be expected. Reduce each loop gain
value to an appropriate value.
2) For servo gain adjustment, refer to the following section:
3.6.2 Setting Servo Gain
Position Reference Unit:
Acceleration/Deceleration 0.1 ms
Time Constant
(Smoothing)
Setting Factory
Range: Setting:
0 to 640 0
Servopack
Reference
Servomotor
pulse
Accelerati
on/decele
ration
Reference
pulse
frequency
Apply acceleration/deceleration
processing
Cn-26 (ACCTME)
Reference
pulse
frequency
For
Position
Control
Only