SV1

Power Down and Lock Out

Ensure the machine is completely powered down and locked out to prevent accidental startup during inspection. Verify zero voltage in the electrical cabinet before proceeding.

Always use a multimeter to confirm zero voltage at the servo drive terminals before touching any components.

Risk of electric shock if power is not properly isolated.

Visually Inspect Fan Motor

Open the electrical cabinet and locate the servo amplifier. Inspect the internal cooling fan for signs of damage, corrosion, or burnt windings. Note any unusual smells indicating burnt insulation.

Use a flashlight to check for hidden damage or debris inside the fan housing.

Do not touch components without proper grounding to avoid static discharge damage.

Test Fan Rotation by Hand

With power off, gently attempt to spin the fan blades by hand. If the fan does not spin freely, the bearings or motor are likely failed, requiring drive repair or replacement.

If the fan feels gritty or stuck, avoid forcing it as this can damage the motor further.

Ensure hands are clean and free of conductive materials to avoid contamination.

Power Down and Lock Out

Shut down the machine completely and lock out power to ensure safety during diagnostic work. Confirm no residual voltage in the cabinet using a multimeter.

Double-check lockout tags to ensure no one else can restore power during testing.

High voltage risk if power is not fully isolated.

Inspect Fan for Obstruction

Check the fan for any debris or obstruction that might prevent rotation. Clear any material and test if the fan spins freely by hand before powering up.

Use compressed air to clean hard-to-reach areas around the fan without disassembling the drive.

Avoid using excessive force that could damage fan blades.

Power Up and Observe Fan Operation

Restore power to the machine and observe if the fan operates. If the fan spins freely by hand but does not run under power, the internal power supply circuit is likely faulty, requiring drive repair or replacement.

Listen for any humming or buzzing from the fan motor, which may indicate a partial power supply issue.

Do not leave the machine running with this alarm active as overheating can occur rapidly.

Power Down and Lock Out

Turn off the machine and lock out power to ensure safety. Verify no voltage is present in the electrical cabinet before opening it.

Keep a log of when the cabinet was last cleaned to track debris accumulation trends.

Risk of electric shock if power isolation is not confirmed.

Inspect Fan for Debris

Open the electrical cabinet and locate the servo amplifier fan. Look for chips, dust, or coolant residue on the fan blades or in the housing that could obstruct movement.

Use a small brush or compressed air to gently remove debris without damaging the fan.

Avoid using liquids for cleaning as they can cause short circuits.

Test Fan After Cleaning

After clearing debris, spin the fan by hand to ensure free movement. Power up the machine and check if the alarm clears and the fan operates normally. If not, consider other causes.

Monitor the fan for a few minutes after power-up to ensure consistent operation.

Do not operate the machine if the fan remains non-functional.

Power Down and Lock Out

Ensure the machine is powered off and locked out for safety. Use a multimeter to confirm no voltage is present in the electrical cabinet.

Wear insulated gloves when working in potentially damp environments to avoid shock.

High risk of electric shock if moisture is present and power is not isolated.

Check for Moisture or Corrosion

Inspect the servo amplifier fan and surrounding area for signs of moisture, rust, or corrosion on the motor or housing. Look for coolant stains or water droplets inside the cabinet.

Use a moisture meter if available to detect hidden condensation in the cabinet.

Avoid touching corroded parts without proper protection as they may be sharp or hazardous.

Address Moisture Source and Test

If corrosion is found, identify and fix the source of moisture (e.g., cabinet sealing issues or coolant leaks). The fan motor is likely damaged and the drive may need repair or replacement. Test fan operation after drying the area if no visible damage is present.

Consider installing a cabinet dehumidifier or improving seals to prevent future issues.

Do not power up if moisture is still present as it can cause short circuits.

Power Down and Lock Out

Shut down the machine and lock out power to ensure safety during inspection. Verify zero voltage in the electrical cabinet with a multimeter.

Document the drive’s serial number to check its manufacturing date with Fanuc support.

Risk of electric shock if power is not properly isolated.

Check Drive Age and History

Locate the servo amplifier’s serial number or manufacturing date on the unit’s label. Review maintenance logs to determine if the drive is beyond its typical 5-7 year fan lifespan or if prior fan issues were noted.

Contact Fanuc support with the serial number to confirm the drive’s age if the label is unclear.

Do not assume age alone is the issue without checking other causes.

Inspect and Plan Replacement

If the drive is significantly aged, inspect the fan for wear or reduced performance even if it spins. Plan for a proactive drive or fan replacement to avoid future failures, especially if other causes are ruled out.

Budget for a spare drive if the unit is near end-of-life to minimize downtime during failures.

Continued use of an aged drive with fan issues risks catastrophic thermal failure.