Fuji Electric FRENIC-HVAC User Manual page 502

J108 PID Control 1 (Tuning)
J109
J208 PID Control 2 (Tuning)
J209
In tuning, the inverter forcibly changes MV under actual load to repeatedly make a speed step
change several times, monitors changes in the feedback signals, estimates P, I, and D
constants for PID control, and writes them to the corresponding function codes automatically.
Depending upon the time constant of feedback signals, short-time or long-time response is
available. It is possible to specify step change values as tuning manipulated values.
If a tuning error occurs, the inverter posts the error code to J108 or J208. According to the
error contents, take any measure. For P, I, and D constants, refer to the description of the
corresponding function codes.
Upon the successful completion of tuning, the inverter continues running under PID control.
 PID control 1, 2 (Tuning) (J108, J208)
Data for J108, J208
0 Disable (No tuning)
For short-time response.
Time constant: approx. 30 s or less.
1
(It takes approx. 10 seconds to 8 minutes.)
For long-time response.
Time constant: approx. 30 s or more.
2
(It takes approx. 30 to 90 minutes.)
If tuning ends abnormally, the inverter posts any of the following values to J108 or J208.
Tuning canceled: Tuning has been canceled due to a run command OFF, PID
100
cancel, fire mode, alarm, etc.
Mode unmatched: The time constant was too large or small. If tuning was
101 performed with J108 (J208) being set to "1" ("2"), change the setting from "1" ("2")
to "2" ("1") to perform tuning again.
MV too small: Almost no change in feedback signals. Increase the setting of J109
102
(J209) and perform tuning again.
MV too large: Too large change in feedback signals. Decrease the setting of J109
103
(J209) and perform tuning again.
MV change: The torque limiter (F40, F41), current limiter (F43) or any other
limiter had been activated so that the speed changed and no normal tuning was
performed. Disable those limiters, increase their limit values, or increase the
104
setting of J109 (J209).
Canceling tuning may also cause this error.
PV too small or large: The feedback signal PV is out of the range from 0 to 100%
105
so that no tuning is possible. Investigate the scaling.
PV unstabilized: To stabilize PV, increase the setting of J113 (J213) or that of C33
106
or C38 (Filter time constant).
Other factors: Tuning impossible. Tuning has been started with no PV-assigned
107
terminal or during running with the upper limit frequency.
(Tuning manipulated value)
(Tuning manipulated value)
6-192
J110 (PID Control 1 (P (Gain))
J111 (PID Control 1 (I (Integral time))
J112 (PID Control 1 (D (Differential time))
J210 (PID Control 2 (P (Gain))
J211 (PID Control 2 (I (Integral time))
J212 (PID Control 2 (D (Differential time))
Function