OH0700

Power down the system and open the control cabinet door. Visually inspect all cooling fans (typically rear panel and internal fans) for rotation damage or debris accumulation.

Allow 5 minutes after power-off for capacitors to discharge before opening cabinet.

Remove and clean all fan filters with compressed air or replace if excessively clogged. Check fan intake and exhaust vents on cabinet exterior for blockage or obstruction.

Power on and verify all fans are spinning at normal speed (audible hum and visible rotation). Check fan connector terminals on power supply board for loose connections or voltage (typically 24VDC).

Replace any failed fans with exact Fanuc replacement part numbers. After fan replacement, clear alarm and monitor cabinet temperature via PMC ladder or maintenance screen for 30 minutes under normal operation.

Use an infrared thermometer or digital thermometer to measure ambient air temperature at cabinet intake vents. Verify temperature is below 40°C (104°F) specification.

Verify minimum clearance requirements: 150mm (6 inches) at rear exhaust, 100mm (4 inches) at side vents. Remove any stored materials, tooling, or obstructions blocking airflow around cabinet.

Check shop floor HVAC system operation. If ambient exceeds 40°C, install supplemental cooling (portable AC unit, exhaust fan, or heat exchanger) directed at cabinet intake area.

Inspect for nearby heat sources: furnaces, welding equipment, direct sunlight through windows. Relocate heat source or install thermal barriers/ventilation ducting to isolate cabinet from external heat.

With cabinet open and powered off, perform visual inspection of all PCBs, power supplies, and servo amplifiers for discoloration, burn marks, bulging capacitors, or burnt component smell.

Use lockout/tagout procedures. Wear appropriate PPE including insulated gloves.

Power on and use infrared thermometer to scan individual modules after 2-3 minutes of operation. Identify any components exceeding 70°C (158°F) or significantly hotter than adjacent identical modules.

Do not touch components - use non-contact measurement only during powered operation.

Check regenerative discharge resistor bank (if equipped) for discoloration or damage. Measure resistance values and compare to specifications in electrical maintenance manual for your specific model.

Replace any identified failed modules with Fanuc-approved replacement parts. After replacement, run system under load monitoring and verify temperature stabilizes below alarm threshold using PMC temperature monitoring signal.