Portal:Process Intelligence/Loop Tuning Studio
Loops Monitored
142
All plants
Flagged for Retuning
11
AI-identified
Avg Tuning Score
78/100
Plant Alpha
Retuning Completed MTD
34
$214K benefit attributed
Cure Oven 01 Zone 2 Temp
52/100
ns=2;s=PA.PaintShop.CureOven01.Zone2_SP
AUTO
Oscillating — ITAE 8.42× optimal
Last tuned: 2026-02-11Plant AlphaLive Trend (30 min)
AI Diagnosis
Loop exhibits decaying oscillation with period 3 min 20 s and amplitude ±2.4°C around SP. Process gain estimated at 1.8, dead time 42 s, time constant 3 min 10 s. Current controller is overtuned on proportional action (Kp high, Ti short). Recommend relaxation toward IMC-tuned parameters.
Process Gain (Kp)
1.8
Dead Time (θ)
42 s
Time Constant (τ)
3 min 10 s
Tuning Comparison
| Parameter | Current | AI Recommended | % Change |
|---|---|---|---|
| Kp | 4.2 | 2.1 | -50% |
| Ti (min) | 0.8 | 2.4 | +200% |
| Td (s) | 12 | 6 | -50% |
Response Simulation
Current Tuning
ITAE
8.42
8.42
Overshoot
18%
18%
Settling
6:20
6:20
Rise
1:05
1:05
Recommended
ITAE
1.81
1.81
Overshoot
2%
2%
Settling
2:40
2:40
Rise
1:20
1:20
SlowFast
LowHigh
LowHigh
Commit to DCS
Write: ns=2;s=PA.PaintShop.CureOven01.Zone2.Kp = 2.1
Write: ns=2;s=PA.PaintShop.CureOven01.Zone2.Ti = 2.4
Write: ns=2;s=PA.PaintShop.CureOven01.Zone2.Td = 6
Protocol: OPC-UA → PCS7-Paint-01
✓ Outside shift handover✓ Loop confirmed in AUTO✓ Bump test window scheduled
Tuning History
| Time | Loop | Method | Before | After | Operator | Score Δ | Status |
|---|---|---|---|---|---|---|---|
| 2026-04-21 13:42 | Chiller 01 Supply Temp | Lambda (IMC) | Kp 3.0 / Ti 1.2 / Td 6 | Kp 2.2 / Ti 2.0 / Td 4 | J. Novak (HITL) | +23 | Verified |
| 2026-04-21 11:18 | AHU-Paint Supply-Air | Lambda (IMC) | Kp 2.5 / Ti 1.0 / Td 5 | Kp 1.8 / Ti 1.5 / Td 3 | Autopilot | +18 | Verified |
| 2026-04-21 09:05 | E-Coat Bath 02 pH | Cohen-Coon | Kp 2.1 / Ti 1.2 / Td 4 | Kp 1.6 / Ti 1.8 / Td 2 | M. Okafor (HITL) | +31 | Verified |
| 2026-04-20 22:30 | Cure Oven 01 Zone 3 | Lambda (IMC) | Kp 3.2 / Ti 1.8 / Td 7 | Kp 2.4 / Ti 2.2 / Td 5 | Autopilot | +19 | Verified |
| 2026-04-20 16:12 | E-Coat Bath 01 Temp | Ziegler-Nichols | Kp 2.8 / Ti 3.0 / Td 9 | Kp 2.0 / Ti 2.5 / Td 5 | J. Novak (HITL) | +14 | Monitoring |
| 2026-04-20 11:45 | WWTP Aeration DO | Lambda (IMC) | Kp 0.5 / Ti 8.0 / Td 0 | Kp 1.0 / Ti 4.0 / Td 0 | Autopilot | +22 | Verified |
| 2026-04-19 14:30 | Compressed Air Header P | Cohen-Coon | Kp 6.0 / Ti 0.8 / Td 6 | Kp 3.5 / Ti 1.5 / Td 3 | M. Okafor (HITL) | +27 | Verified |
| 2026-04-19 09:22 | Spray Booth 03 Humidity | Lambda (IMC) | Kp 0.7 / Ti 6.0 / Td 6 | Kp 1.2 / Ti 3.0 / Td 4 | Autopilot | +16 | Monitoring |
| 2026-04-18 17:55 | Battery Dryer Z1 | Lambda (IMC) | Kp 1.0 / Ti 7.0 / Td 12 | Kp 1.8 / Ti 3.5 / Td 8 | P. Shah (HITL) | +25 | Verified |
| 2026-04-18 10:08 | Boiler Drum Level | Ziegler-Nichols | Kp 4.0 / Ti 1.0 / Td 12 | Kp 2.2 / Ti 2.8 / Td 7 | Autopilot | +20 | Verified |