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4. PRESSURE LOOP GAIN ADJUSTMENT
(b) For a machine providing a constant pressure when the servo motor rotates
First, set [Pr. PT01], [Pr. PT02], and [Pr. PT03] as follows.
Next, if an overshoot or a vibration occurs when [Pr. PT03] is set to "10000", decrease the value of
[Pr. PT03] until the overshoot or the vibration stops.
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
Large
Setting value of [Pr. PT03]
[Pr. PT02 Pressure integral compensation]
High
Low
Small
Large
Setting value of [Pr. PT02]
4.6 Checking of adjustment result
After adjusting the pressure loop gain, check the operation by executing the pressure control cycle operation
with the actual operation patterns. When there is no problem, the pressure control adjustment is complete. If
a vibration occurs, execute "4.5 Adjustment of pressure loop gain" again.
Parameter
Symbol
PT01
APA
Set the result of (2) adjustment of the proportional control gain (pressure
loop gain)
PT02
AIA
Set "500".
PT03
ADA
Set "10000".
Pressure command
If the setting value of [Pr. PT03] is small, the pressure does not reach to the command.
A too large setting value will generate overshoot.
Pressure command
Decreasing the setting value of [Pr. PT02] improves track ability to the command.
A too small setting value will generate overshoot or vibration.
Increasing the setting value of [Pr. PT03]
Pressure feedback
Decreasing the setting value of [Pr. PT02]
4 - 7
Setting
Pressure feedback
Time
Time
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