SRVO-130

Visual and Audible Fan Inspection

With controller powered on (before alarm triggers if possible), open the cabinet door and visually confirm the alpha iPS cooling fan is spinning. Listen for abnormal bearing noise, grinding, or intermittent operation. The fan should run continuously during operation. Fan is typically located on the front or side of the power supply module.

Exercise caution when opening energized cabinets. Do not touch internal components. Only observe fan operation.

Check Fan Power Supply Voltage

Power down the controller and use a multimeter to verify fan power supply voltage at the fan connector. Alpha iPS fans typically operate at 24VDC or 200VAC depending on model. Check connector pins for corrosion or loose connections. Refer to power supply module maintenance manual (HW1484xxx series) for specific fan voltage specifications.

Disconnect main power and verify with voltage tester before checking connections.

Measure Fan Airflow

Use an anemometer or airflow indicator to measure actual airflow output from the cooling fan. Compare against specifications in the alpha iPS maintenance manual. Reduced airflow with fan running indicates bearing wear or internal obstruction.

Keep spare cooling fans in inventory. Fan replacement is straightforward and prevents extended downtime. Alpha iPS fans are field-replaceable without changing the entire module in most cases.

Inspect Fan Blades and Intake Vents

Check for dust accumulation, debris, or physical damage to fan blades. Inspect the intake vents on the power supply module for blockage. Even partial obstruction can reduce airflow by 30-40%, causing thermal issues during high-load operation.

Establish a preventive maintenance schedule for fan cleaning every 3-6 months in dusty environments. Use compressed air to clean, blowing from inside-out to avoid pushing debris deeper into the module.

Inspect and Replace Cabinet Air Filters

Locate the air filter assemblies on the controller cabinet (typically bottom or side panels). Remove and inspect filters for dust loading. Replace if visibly dirty or if in service beyond manufacturer recommendation (typically every 3-6 months). Use only genuine Fanuc replacement filters or approved equivalents to maintain proper airflow characteristics.

In high-dust environments (grinding, machining), check filters monthly. Consider upgrading to high-efficiency filters or adding a pre-filter stage. Document filter changes with date labels on the filter housing.

Verify Cabinet Ventilation Clearances

Ensure minimum 300mm (12 inches) clearance around all cabinet ventilation openings per Fanuc installation manual. Check that exhaust vents are not blocked by walls, other equipment, or stored materials. Verify intake vents are not drawing in hot air from nearby heat sources.

Inadequate clearance violates installation requirements and may void warranty. Relocate obstructions or reposition equipment if necessary.

Measure Cabinet Internal Temperature

Use a digital thermometer to measure ambient temperature inside the controller cabinet near the power supply module. Access temperature data via teach pendant: MENU > SYSTEM > Variables > $THRMGRP[1].$TEMP_DATA (displays internal temperatures by group). Ambient should not exceed 55°C. If higher, evaluate facility cooling or add supplemental cabinet air conditioning.

Log internal temperatures during peak production shifts. Trending data helps identify seasonal issues or gradual filter clogging before alarms occur.

Check Facility HVAC and Environmental Conditions

Verify facility ambient temperature is within specification (0-45°C per R-30iB mechanical unit maintenance manual). Check that HVAC is functioning properly and not creating hot spots near the controller. Ensure the controller is not exposed to direct sunlight, radiant heat from furnaces, or hot air exhaust from other equipment.

In hot environments, consider installing a cabinet-mounted air conditioner (Fanuc offers approved models). A 1-2°C reduction in cabinet temperature significantly extends power supply component life.

Review Robot Program Cycle Time and Load

Analyze the robot program for continuous high-speed moves without dwell periods. Access program on teach pendant and review motion commands (J/L/C moves) for velocity settings. Check payload configuration: MENU > SETUP > Frames > Payload. Verify actual payload matches configuration. Overloading increases motor current and power supply heat generation.

Use the Program Touchup function to add 0.5-1.0 second dwell periods (WAIT command) every 10-15 moves in high-duty programs. This allows brief thermal recovery without significantly impacting cycle time.

Monitor Power Supply Load Current

Check power supply current draw during operation. Access diagnostics: MENU > SYSTEM > Variables > display $CRNT_AMP[*] (servo amplifier current) or use a clamp meter on the power supply input lines. Compare against alpha iPS rated capacity (typically 20-50A continuous depending on model). Sustained operation above 80% rated capacity generates excessive heat.

Log current data during a complete production cycle. If consistently high, consider optimizing motion parameters (reduce acceleration, lower speed on non-critical moves) or evaluate if power supply is undersized for application.