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Speed control
This inverter can control a motor under speed, torque or position control. (As required, set "1" (extended function
parameters valid) in Pr. 160 "extended function selection".)
Refer to page 150 for details of Pr. 160 "extended function selection". (Since the factory setting of Pr. 77 is "0",
perform parameter write in the PU mode or during a stop.)
2.2 Speed control
2.2.1 Outline of speed control
The basics of speed control are explained in the Instruction Manual (basic).
2.2.2 Easy gain tuning function block diagram
Refer to the Instruction Manual (basic) for the connection diagram, test run and
easy gain tuning.
Set the run command. (Refer to page 117.)
Set the motor. (Refer to the Instruction Manual (basic).)
Set any of "0 (speed control), 2 (speed-torque switchover), 4 (speed-position switchover)" in Pr. 800 "control
system selection" to make speed control valid.
Pr. 800 is factory-set to 0 (speed control) (Refer to page 169.)
Test run
As required
1) Gain adjustment
Perform easy gain tuning. (Refer to the Instruction Manual (basic).)
Perform model adaptive control/speed feed forward control. (Refer to page 49.)
Perform manual input gain adjustment. (Refer to page 46.)
To achieve faster responsiveness to the speed command change
(when faster responsiveness is desired)
For further fine adjustment of gains
2) Set the torque limit value.
+
-
Automatic setting
Load inertia ratio
Pr.880
Speed control/position loop gain
Model speed control gain
Pr.820, Pr.821,
Pr.828, Pr.422
Turn on with the
Pr. 819 setting "1 or 2"
Speed/position feedback
Command
Current
control
Load
inertia
moment
Motor
Detector
Gain table
Torque command
Load inertia
ratio estimation
section
Actual speed
Easy gain tuning
response level
setting
(Pr.818)
Easy gain tuning
selection
(Pr.819)
+
-
Turn on with the
Pr. 819 setting "1"
Encoder