> Category 1: VFDs & Servo Drives (Automation & Motion)
1. VFD Overcurrent Trip (During Acceleration): Diagnosing excessive load, wrong ramp time, or motor short.
2. DC Link Overvoltage: Detecting grid spikes or lack of dynamic braking resistor during deceleration.
3. Ground Fault (Earth Leakage): Identifying insulation failure in motor cables or stator windings.
> Category 2: PLCs, HMIs & Industrial Communication
21. Profibus DP Node Offline: Diagnosing missing termination resistors, address conflicts, or EMI noise.
22. Profinet Topology Mismatch: Identifying incorrect port connections against hardware configuration.
> Category 6: CNC, Robotics & Advanced Motion
101. Robot Joint Collision Detect (Overtorque): Diagnosing physical impact, heavy payload, or incorrect tool center point (TCP) calibration.
102. CNC Spindle Drive Overheat: Identifying choked coolant lines, degraded spindle bearings.
> Category 4: Hydraulics, Pneumatics & Utilities
61. Hydraulic Pump Excessive Noise (Aeration): Diagnosing air entering via loose suction lines or low reservoir levels.
62. Cylinder Seal Bypass (Internal Leak): Identifying worn piston seals causing cylinder drift under load.
> Category 7: HVAC, Chillers & Thermal Systems
121. Chiller Low Suction Pressure: Diagnosing refrigerant leaks, blocked expansion valves, or low evaporator heat load.
122. Compressor High Discharge Temperature: Identifying condenser fouling, non-condensable gases, or failed cooling tower fans.
> Category 14: Boilers, Furnaces & Thermal Process Plants
261. Burner Modulation Motor Stuck: Diagnosing stripped internal potentiometer gears or seized linkages to the air damper.
262. Boiler Feed Water Pump Gland Packing Leak: Identifying worn graphite rings, scored shafts, or lack of cooling water flush.
> Category 3: Motors, Pumps & Rotating Machinery
41. Bearing Temperature High: Diagnosing over-lubrication, lack of grease, or mechanical overload.
42. Stator Winding Short to Ground: Identifying insulation breakdown via megger test correlation.
> Category 9: Power Distribution, UPS & Gensets
161. UPS Bypass Mode Active: Diagnosing inverter IGBT failure, DC bus overvoltage, or excessive load crest factor.
162. Battery Bank High Internal Resistance: Identifying dry cells, sulfation, or loose inter-cell link connections.
> Category 10: Process Instrumentation & Control
181. PID Loop Oscillation (Hunting): Diagnosing excessively high proportional gain (P) or integral action (I) too fast.
182. Coriolis Mass Flow Meter Air Bubble Error: Identifying two-phase flow, empty pipe conditions, or cavitation.
> Category 8: Material Handling, Conveyors & Cranes
141. Conveyor Belt Tracking Drift: Diagnosing misaligned snub rollers, material buildup on tail pulleys, or uneven belt splicing.
142. Hoist Brake Slipping (EOT Crane): Identifying worn brake shoe linings, weak spring tension, or oil contamination.
> Category 11: Injection Molding, Die Casting & Plastics Processing
201. Toggle Clamp Mechanism Stuck: Diagnosing mechanical link binding, lack of automatic lubrication, or excessive clamping force.
202. Barrel Heater Band Open Circuit: Identifying burnt terminal pins or split ceramic insulation reading ambient temperatures.
> Category 36: Electronics Hardware, SMT Assembly & Semiconductor Robotics
701. SMT Pick-and-Place Head Vacuum Drop: Diagnosing worn nozzle O-rings, clogged vacuum filters, or rapid micro-solenoid degradation.
702. Reflow Oven Zone Temperature Jitter: Identifying failed solid-state relays (SSRs), degraded heating elements, or thermo-couple drift.
> Category 41: Petrochemical Pipelines, Tank Farms & Terminal Automation
801. Motorized Valve Actuator Torque Limit Trip: Diagnosing internal valve seat obstruction, worn gearbox worm drives.
802. Radar Level Gauge Echo Loss (Boiling Liquid): Identifying surface turbulence, heavy dielectric constant shifts, or condensation buildup.
> Category 15: Heavy Utilities, Water Treatment & Air Networks
281. Air Dryer Purging Valve Stuck Open: Diagnosing pilot solenoid contamination causing continuous depressurization and pressure loss.
282. Cooling Water Circulating Pump Shaft Grooving: Identifying packing compression damage or abrasive silt in the process water.
> Category 76: Factory EPC Site Commissioning, SAT/FAT Verification
1501. Site Acceptance Test Multi-Panel Interlocking Failure: Diagnosing cross-panel terminal ferrule mapping errors, dynamic loop voltage drops over long site runs.
1502. EPC Cable Trench HV/LV Segregation Violation: Identifying high-frequency electromagnetic cross-talk noise coupling from unshielded 415V cables.
> Category 61: Advanced Aviation Ground Support, MRO Test Cells & Aerospace
1201. Gas Turbine Test Cell Dynamometer Torque Measurement Signal Drift: Diagnosing high-frequency strain gauge calibration drift under transient thermal conditions.
1202. Aircraft Landing Gear Actuator Hydraulic Test Rig Proportional Valve Null Shift: Troubleshooting internal torque motor coil magnetic asymmetry or particulate deposits.