Mitsubishi Electric MELSERVO MR-J4-B-LL Series Instruction Manual page 69

4. PRESSURE LOOP GAIN ADJUSTMENT
(a) For a machine providing a constant pressure when the servo motor stops
First, set [Pr. PT01], [Pr. PT02], and [Pr. PT03] as follows.
Next, increase the value of [Pr. PT03] gradually. If an overshoot or a vibration occurs, decrease the
value slightly. It is not necessary to set too large value in [Pr. PT03].
Then, decrease the value of [Pr. PT02] gradually. If an overshoot or a vibration occurs, increase the
value slightly.
The following shows the relation between the setting value of the integral control gain (pressure
integral compensation and pressure incomplete integral coefficient) and the response performance.
[Pr. PT03 Pressure incomplete integral coefficient]
High
Low
Small
Setting value of [Pr. PT03]
[Pr. PT02 Pressure integral compensation]
High
Low
Small
Setting value of [Pr. PT02]
Parameter Symbol
PT01 APA
PT02 AIA
PT03 ADA
Pressure command
Large
Increasing the setting value of [Pr. PT03] improves track ability to the command.
A too large setting value will generate overshoot or vibration.
Pressure command
Large
Decreasing the setting value of [Pr. PT02] improves track ability to the command.
A too small setting value will generate overshoot or vibration.
Set the result of (2) adjustment of the proportional control gain
(pressure loop gain)
Set "500".
Set "5000".
Pressure feedback
Increasing the setting value of [Pr. PT03]
Pressure feedback
Decreasing the setting value of [Pr. PT02]
4 - 6
Setting
Time
Time