Mitsubishi Electric FR-A800 Series Instruction Manual page 257

• The time in acceleration/deceleration driving until 1500 r/min is reached in 5 seconds or less.
• The rotation speed in driving is 150 r/min or higher.
• The acceleration/deceleration torque is 10% or higher.
• No sudden external disturbances during acceleration/deceleration.
• The load inertia ratio is about 30-fold or lower.
• No gear backlash or belt sagging.
3.
Press
(The operation command during External operation is the STF or STR signal.)
 Execution procedure for easy gain tuning (Pr.819 = "2" Load inertia ratio
manual input)
Easy gain tuning (Load inertia ratio manual input) is valid in the speed control mode under Real sensorless vector control, the
speed control and position control modes under Vector control, and the speed control mode under PM sensorless vector
control.
1.
Set the load inertia ratio for the motor in Pr.880 Load inertia ratio.
2.
Set "2" (easy gain tuning enabled) in Pr.819 Easy gain tuning selection. After setting, Pr.820 Speed control P
gain 1 and Pr.821 Speed control integral time 1 are set automatically.
Operation is performed with the adjusted gain from the next operation.
3.
Perform the test operation, and set the response level in Pr.818 Easy gain tuning response level setting. Setting
this parameter higher improves the trackability for commands, but setting it too high causes vibration. (The response
level can be adjusted during operation when Pr.77 Parameter write selection ="2" (parameters can be written
during operation).)
NOTE
• When Pr.819 = "1 or 2" is set, even if the Pr.819 setting value is returned to "0" after tuning is performed, the data that was
set in each parameter is retained in the tuning results.
• If good precision cannot be obtained even after executing easy gain tuning, because of external disturbances or other reasons,
perform fine adjustment manually. At this time, set the setting value of Pr.819 to "0" (no easy gain tuning).
 Parameters set automatically by easy gain tuning
The following table shows the relationship between the easy gain tuning function and gain adjustment parameters.
Pr.880 Load inertia ratio
Pr.820 Speed control P gain 1
Pr.821 Speed control integral
time 1
Pr.828 Model speed control
gain
Pr.422 Position control gain
Pr.446 Model position control
gain
NOTE
• If easy gain tuning is executed at an inertia equal to or higher than the specified value under Vector control, a fault such as
hunting may occur. Also, if the motor shaft is fixed by the servo lock or position control, the bearing may be damaged. In this
case, do not perform easy gain tuning. Adjust the gain manually.
• The load inertia ratio is only calculated under Vector control.
256
5. PARAMETERS
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
Downloaded from ManualsNet.com
or to calculate the continuous load inertia ratio, or calculate the gain.
0
The inertia calculation result (RAM) using easy gain
tuning is displayed.
The parameter is set at the following times.
• Every hour after turning ON the power
Manual input
• When Pr.819 is set to a value other than "1"
• After changing to a control other than Vector
control (such as V/F control) using Pr.800
Write (manual input) is available only during a stop.
The tuning result (RAM) is displayed.
The parameter is set at the following times.
• Every hour after turning ON the power
Manual input • When Pr.819 is set to a value other than "1"
• After changing to a control other than Vector
control (such as V/F control) using Pr.800
Write (manual input) is not available
search engine
Easy gain tuning selection (Pr.819) setting
1 2
Manual input
Gain is calculated when Pr.819 is
set to "2", and the result is set in
the parameter.
When read, the tuning result
(parameter setting value) is
displayed.
Write (manual input) is not
available