AHU Temperature Controller — PID + VFD Simulation
Reverse-acting PID · Derivative on PV · Anti-windup
Temperature (PV)
--
Setpoint (SP)
--
VFD Output
--
Error
--
Sim Time
--
Temperature & VFD Output
PID Terms (P / I / D)
Setpoint
18 °C
24.0 °C
30 °C
PID Gains (positive values)
Kp (Proportional)
Ki (Integral)
Kd (Derivative)
Apply Gains
Disturbance
Ambient Temperature
25 °C
35 °C
45 °C
Mode
Auto
Reset
Manual VFD %
0%
0%
100%
Auto-Tuner (Relay Feedback)
Tuning Method
Ziegler–Nichols (Classic)
Tyreus–Luyben (Less Overshoot)
No-Overshoot (Conservative)
Start Auto-Tune
Stop
Apply Gains
--
K
u
=
--
T
u
=
--
s
Suggested: Kp=
--
Ki=
--
Kd=
--
PID Tuning Guide
Set
Ki = 0
,
Kd = 0
.
Increase
Kp
until temp oscillates steadily. Note this value as K
u
and the oscillation period T
u
.
Apply Ziegler–Nichols:
Kp
= 0.6 × K
u
Ki
= 1.2 × K
u
/ T
u
Kd
= 0.075 × K
u
× T
u
Fine-tune: increase Ki to reduce steady-state error; increase Kd to reduce overshoot.