5.3 Description of Function Codes 5.3.8 J codes (Applied functions)
The method for refining the system response from the waveforms is shown below.
1) Suppressing overshoot
Increase the data of J04 (Integral time) and decrease that of J05 (Differential time).
2) Quick stabilizing (Moderate overshoot is allowable.)
Decrease the data of J03 (Gain) and increase that of J05 (Differential time).
3) Suppressing oscillation whose period is longer than the integral time specified by J04
Increase the data of J04 (Integral time).
4) Suppressing oscillation whose period is approximately the same as the time specified by J05 (Differential
time)
Decrease the data of J05 (Differential time).
Decrease the data of J03 (Gain), if the oscillation cannot be suppressed even though the differential time is
set at 0 sec.
Feedback filter (J06)
J06 specifies the time constant of the filter for feedback signals under PID control.
• Data setting range: 0.0 to 900.0 (s)
• This setting is used to stabilize the PID control loop. Setting a too long time constant makes the system response
slow.
When speed control (dancer) is selected (J01 ≠ 3 → = 3), the J06 setting value automatically changes to
0.0 s.
To specify the filter time constant in detail, apply an analog input filter (C33, C38 and C43). When speed
control (dancer) is not selected (J01 = 3 → ≠ 3), the J06 setting value automatically changes to 0.5 s. Set
J06 after setting J01.
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