Fuji Electric FRENIC-HVAC User Manual page 507

4) Suppressing oscillation whose period is approximately the same as the time specified by
function code J112/J212 (Differential time)
Decrease that of J112/J212 (Differential time).
Decrease the data of function code J110/J210 (Gain), if the oscillation cannot be
suppressed even though the differential time is set at 0 sec.
 Feedback filter (PID control 1: J113 / PID control 2: J213)
J113/J213 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 too long a time constant makes
the system response slow.
J114 PID Control 1 (Anti-reset wind-up)
J114 suppresses overshoot under control using a PID processor. Set PID control 1 and PID
control 2 with function codes J114 and J214, respectively. As long as the deviation between
the PID command and its feedback is out of the preset range, the integrator holds its value and
does not perform integration operation.
- Data setting range: OFF (Disable), 0.01 to 9990.00 (Setting range is limited by the
maximum and minimum scales.)
6.3 Details of Function Codes
J214 (PID Control 2 (Anti-reset wind-up))
6-197