Yaskawa SGDB - Manual (Page 134)

APPLICATIONS OF Σ-SERIES PRODUCTS
3.6.6 Using Mode Switch cont.
122
J Selecting a Mode Switch
SERVOPACKs can use four types of mode switches. To select a mode switch, use the
following memory switch.
Memory
Switch Cn-01
Mode Switch Setting Parameter Unit
Bit
D
Bit
C
Bit
B
Mode Switch Setting Parameter Unit
− − 1
Does not use mode
switch.
0 0 0
Uses torque reference as
a detection point.
(Standard setting)
Cn-0C
Percentage of rated
torque: %
0 1 0
Uses speed reference as
a detection point.
Cn-0D Motor speed: min −1
1 0 0
Uses acceleration refer-
ence as a detection point. Cn-0E
Motor acceleration:
10 (min −1 )/s
1 1 0
Uses error pulse as a
detection point.
Cn-0F Reference unit
When Torque Reference Is Used as a Detection Point of Mode Switch
(Standard Setting)
If a torque reference exceeds the torque value set
in parameter Cn-0C, the speed loop switches to P
control.
The SGDB SERVOPACK is factory set to this
standard mode (Cn-0C = 200).
Example of Use:
If a mode switch is not used and PI control is always performed, torque may enter a
saturation state during acceleration or deceleration, causing the motor speed to have
overshoot or undershoot.
Using the mode switch suppresses torque saturation and prevents the motor speed
from having overshoot and undershoot.
Without mode switch
Overshoot
Motor
speed
Undershoot
Time
With mode switch
Motor
speed
Time
3
Speed
Reference
speed
Motor
speed
Internal torque
reference
Torque
PI control
P control
PI control PI control
P control