Sigma II User’s Manual
Chapter 5: Parameter Settings and Functions
5-44
limit depends on the load condition.
This parameter sets the voltage range for speed reference input V-REF (CN1–5)
according to the output range of the host controller or external circuit.
When the default setting (600) is multiplied by 0.01V, the result (6V) corresponds to
the rated motor speed.
5.2.8
Torque Feed-Forward Function
The torque feed-forward function is used only in speed control (analog reference).
This function is used to:
•
Shorten positioning time.
•
Differentiate a speed reference at the host controller to generate a torque feed-
forward reference.
•
Input this reference together with the speed reference to the servo amplifier.
Too high a torque feed-forward value will result in overshooting or undershooting.
To prevent this, set the optimum value while closely observing the system response.
Connect a speed reference signal to V-REF (CN1-5 and 6) and a torque feed-forward
Parameter
Signal
Setting
(no units)
Control Mode
Pn300
Speed Reference Input Adjust-
ment Factor (SRF)
(0.01V
×
SRF =Rated Speed)
Setting Range: 150 to 3000
Default Setting: 600
Speed/Torque Control
Motor speed
Speed limit range
V-REF
Reference voltage (V)
Reference
speed
(rpm)
This slope is set.