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How to Adjust the Gain at Position Control Mode
① Start the motor (machine).
② Set Pr10 (1st Position Loop Gain) to 50.
③ Increase the value of Pr11 (1st Velocity Loop Gain) gradually until the motor
(machine) does not generate abnormal sound or vibration.
④ Increase the value of Pr10 (1st Position Loop Gain) gradually until the motor
(machine) does not generate abnormal sound or vibration.
⑤Decrease the value of Pr12 (1st Velocity Loop Integration Time Constant) accord
ing to the In-position time.
・With a larger value, positional errors may not be converged.
⑥ If you want to improve the response further, adjust Pr15 (Velocity Feed Forward)
within the extent that the
motor (machine) does not generate abnormal sound or
vibration.
・With a larger value, overshoot and/or chattering of in-position signals may occur,
which results in a
longer in-position time. Note that this may be improved by ad-
justing the value of Pr16 (Feed Forward Filter).
How to Adjust the Gains for Velocity Control
1.If the controller does not have a position loop gain
Adjust Pr11 (1st Velocity Loop Gain) and Pr12 (1st Velocity Loop Integration Time
Constant). Note that Pr15 (Velocity Feed Forward) is not effective.
① Increase the value of Pr11 (1st Velocity Loop Gain) gradually until the motor
(machine) does not generate abnormal sound or vibration.
②Decrease the value of Pr12 (1st Velocity Loop Integration Time Constant) gradu-
ally until the overshoot/undershoot is reduced to an acceptable level.
2.
If the controller has a position loop gain
①Set Pr58 (Acceleration Time Set-Up), Pr59 (Deceleration Time Set-Up) and Pr5A
(S-Curve Accel/Decel Time Set-Up) to 0.
② Increase the value of Pr11 (1st Velocity Loop Gain) gradually until the motor
(machine) does not generate abnormal sound or vibration.
③Decrease the value of Pr12 (1st Velocity Loop Integration Time Constant) gradu-
ally until the overshoot/undershoot is reduced to an acceptable level.
④ Adjust the position loop gain on the controller.
<Notes>
Position loop gain changes when you change the value of Pr50 (Velocity Command
Input Gain).
Relationship between command voltage and velocity
6V at 3000r/min
6V at 1500r/min
6V at 4500r/min
Pr50 value
Default = 500
250
750
Position loop gain set in the controller
Assuming this is 1
1/2
1.5 times
Preparations and Adjustment
Examples
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