Speed control under Real sensorless vector control, vector control, PM sensorless vector control
Parameters
5 - 110
Speed feed forward control (Pr. 877 = "1")
●
When the load inertia ratio is set in Pr. 880, the required torque for the set inertia is calculated
according to the acceleration and deceleration commands, and the torque is generated quickly.
●
When the speed feed forward gain is 100%, the calculation result for speed feed forward is applied
as is.
●
If the speed command changes suddenly, the torque is increased by the speed feed forward
calculation. The maximum limit for the speed feed forward torque is set in Pr. 879.
●
The speed feed forward result can also be lessened with a primary delay filter in Pr. 878.
I002520E
Fig. 5-29:
Block diagram of speed feed forward control
NOTES
The speed feed forward control is enabled for the first motor.
Even if the driven motor is switched to the second motor while Pr. 877 = "1", the second motor is
operated as Pr. 877 = "0".
Under PM sensorless vector control, this function is available when low-speed range high-torque
characteristic is enabled by Pr. 788 "Low speed range torque characteristic selection" = "9999 (ini-
tial value)". (Refer to page 5-75.)
+
-
+
+
+
Speed feed forward control
Load inertia ratio
J•s
[Pr. 880]
Speed feed
forward
gain
[Pr. 881]
[Pr. 879]
Speed feed
forward torque
limit
[Pr. 878]
Speed feed
forward
limit
Speed control
integral time 1
[Pr. 821]
Speed
control P
gain 1
[Pr. 820]
Actual speed controller
Speed
command
Torque
control
Speed
estimator
M
Summary of Contents for FR-A800
Page 2: ......
Page 4: ......
Page 22: ...Contents XVIII ...
Page 30: ...Related manuals Introduction 1 8 ...
Page 122: ...Connection of stand alone option units Installation and wiring 2 92 ...
Page 180: ...Basic operation procedure JOG operation Basic operation 4 32 ...
Page 934: ...Check first when you have a trouble Protective functions 6 46 ...
Page 1031: ...Appendix EC Declarations of Conformity FR A800 A 47 ...
Page 1032: ...EC Declarations of Conformity Appendix A 48 ...
Page 1033: ...Appendix EC Declarations of Conformity FR A800 A 49 ...
Page 1034: ...EC Declarations of Conformity Appendix A 50 ...
Page 1035: ...Appendix EC Declarations of Conformity FR A800 A 51 A 5 2 EMC Directive ...
Page 1036: ...EC Declarations of Conformity Appendix A 52 ...
Page 1037: ...Appendix EC Declarations of Conformity FR A800 A 53 ...
Page 1038: ...EC Declarations of Conformity Appendix A 54 ...
Page 1039: ...Appendix EC Declarations of Conformity FR A800 A 55 ...
Page 1040: ...EC Declarations of Conformity Appendix A 56 ...
Page 1041: ......