Yaskawa FSP Amplifier - Manual (Page 107)

FSP Amplifier User’s Manual Chapter 5: Parameter Settings and Functions
5-40
The maximum speed of the servomotor will be used if Pn407 is set to a
value higher than the maximum speed of the servomotor.
External Speed Limit Function:
This function 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 0.01 V, the result (6 V)
corresponds to the rated motor speed.
Parameter Signal
Setting (0.01 V / Rated
Motor Speed)
Control Mode
Pn300
Speed Reference
Input Gain Range: 150 to 3000
Default Setting: 600 Speed Control and
Programming
The default setting is 6 V = the rated motor speed.
Principle of Speed Limit
When the control speed range is exceeded, the torque, which is inversely
proportional to the difference between the speed limit and the actual speed,
is fed back in order to return the system to a level within the control speed
range. In effect, the actual motor speed limit depends on the load condition.
Motor
speed
V-REF
Speed limit
range
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 an overshoot or an
undershoot. To prevent this, set the optimal value while closely observing
the system response.
Connect a speed reference signal to V-REF (CN1-5 and 6) and a torque
feed-forward reference signal to T-REF (CN1-9 and 10).