Performing High-Accuracy, Fast-Response Control (Gain Adjustment For Real Sensorless Vector Control, Vector Control, And Pm Sensorless Vector Control) - Mitsubishi Electric FR-A800 Series Instruction Manual

5.3.5 Performing high-accuracy, fast-response control
(gain adjustment for Real sensorless vector
control, Vector control, and PM sensorless vector
control)
Sensorless Sensorless Vector Sensorless Vector Vector
The load inertia ratio (load moment of inertia) for the motor is calculated in real time from the torque command and rotation
speed during motor driving by the Vector control. Because the optimum gain for speed control and position control is set
automatically from the Load inertia ratio and the response level, the work required for gain adjustment is reduced. (Easy gain
tuning)
If the load inertia ratio cannot be calculated due to load fluctuations, or under Real sensorless vector control or PM sensorless
vector control, the control gain can be set automatically by entering the load inertia ratio manually.
Manual gain adjustment is useful for achieving optimum machine performance or improving unfavorable conditions, such as
vibration and acoustic noise during operation with high load inertia or gear backlash.
Pr.
818 Easy gain tuning response level
C112 setting
819
Easy gain tuning selection
C113
820
Speed control P gain 1
G211
821
Speed control integral time 1
G212
830
Speed control P gain 2
G311
831
Speed control integral time 2
G312
880
Load inertia ratio
C114
1115 Speed control integral term
G218 clear time
1116 Constant output range speed
G206 control P gain compensation
1117 Speed control P gain 1 (per-unit
G261 system)
1118 Speed control P gain 2 (per-unit
G361 system)
1121 Per-unit speed control
G260 reference frequency
1348 P/PI control switchover
G263 frequency
*1 For the FR-A820-03160(55K) or lower, and FR-A840-01800(55K) or lower.
*2 For the FR-A820-03800(75K) or higher, and FR-A840-02160(75K) or higher.
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5. PARAMETERS
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
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PM PM PM
Initial
Name
value
2
0
60%
0.333 s
9999
9999
7-fold
0 ms
0%
9999
9999
*1
120 Hz
*2
60 Hz
0 Hz
search engine
Setting
range
Set the response level.
1 to 15
1 (Slowest) to 15 (Fastest)
0 No easy gain tuning
Gain is calculated with load calculation
1
(This function is valid under Vector control.)
2 Gain is calculated with load (Pr.880) manual input
The proportional gain during speed control is set. (Setting this
parameter higher improves the trackability for speed command
0 to 1000%
changes. It also reduces the speed fluctuation caused by external
disturbance.)
The integral time during speed control is set. (Setting this
0 to 20 s parameter lower shortens the return time to the original speed
when the speed fluctuates due to external disturbance.)
0 to 1000% Second function of Pr.820 (valid when RT signal is ON)
9999 The Pr.820 setting is applied to the operation.
0 to 20 s Second function of Pr.821 (enabled when the RT signal is ON)
9999 The Pr.821 setting is applied to the operation.
0 to 200-fold Set the load inertia ratio for the motor.
Set time until the integral term is reduced and cleared after P
0 to 9998 ms
control switching.
Set a compensation amount of the speed control P gain in the
0 to 100%
constant output range (rated speed or higher).
0 to 300 Set a proportional gain under speed control in the per-unit system.
9999 The Pr.820 setting is applied to the operation.
0 to 300 Second function of Pr.1117 (valid when RT signal ON)
9999 The Pr.1117 setting is applied to the operation.
Set the speed at 100% when setting speed control P gain or
0 to 400 Hz
model speed control gain in the per-unit system.
0 to 400 Hz Set the motor speed for the P/PI control switchover.
Description