47
ENCODER FEEDBACK CONTROL—A500(L)
4.8.5
Pr. 372 "speed control P gain" (factory setting: 100%)
Used to set the proportional gain of the speed loop.
A high setting will make the speed response faster but if the setting is too high this will cause vibrations and noise.
4.8.6
Pr. 373 "speed control I gain" (factory setting: 20%)
Used to set the integral gain of the speed loop.
A high setting will shorten restoration time at occurrence of speed variation but if the setting is too high this
will cause speed overshooting.
4.8.7
Driving/regenerative status signal output (Y32)
When vector control is selected, the driving/regenerative status is output as a signal.
Assign the function of the output signal to any of the output terminals using Pr. 190 to Pr. 195 "output
terminal function selection".
4.8.8
Operation ready 2 signal (RY2)
Output during operation (on completion of pre-excitation operation) under vector control. (switched on also
during DC injection brake, 0 speed control or servo lock)
When opening the brake of a motor with brake, use the RY2 (operation ready 2) signal. (The brake may not
be opened if the FU (output frequency detection) signal is used.)
4.8.9
Instructions for vector control.
1) When using vector control, perform offline auto tuning in the motor rotation mode (while the motor is running).
(Refer to the inverter manual.)
2) Before starting operation, always confirm that the correct number of poles of the motor used. Proper
speed control cannot be performed if the number of motor poles is incorrect.
3) Couple the encoder in line with the motor shaft with a speed ratio of 1 to 1 without any mechanical looseness.
4) Make sure that the encoder has been set to the correct rotation direction on the rotation direction display
of the parameter unit. If the rotation direction is not correct, vector control cannot be carried out.
