231-8068

Power down CC controller safely

Execute controlled shutdown via TNC operating panel, ensure all axes are in safe position, then disconnect main power to CC unit.

Never remove CC covers while powered - risk of electrical shock and component damage

Visual inspection of cooling fan

Remove CC controller cover and inspect fan assembly for visible obstructions, damaged blades, or accumulated debris around fan housing.

Use compressed air at low pressure to clear dust buildup, but support fan blades to prevent overspin damage

Manual fan rotation test

With power disconnected, manually rotate fan blades to check for bearing roughness, binding, or excessive play in fan shaft.

Smooth rotation indicates good bearings; grinding or resistance suggests bearing replacement needed

Fan replacement if defective

Replace fan assembly with HEIDENHAIN-approved part number, ensuring proper connector orientation and secure mounting.

Use only specified replacement fans - incorrect voltage or current draw can damage CC power supply

Access CC diagnostic parameters

Navigate to TNC Setup menu → Machine Parameters → CC Controller → Thermal Monitoring to view current fan speed readings and temperature values.

Compare displayed fan RPM with audible fan operation - significant discrepancy indicates sensor issue

Check CC internal temperature readings

Monitor CC internal temperature parameters during normal operation - excessive temperatures may indicate cooling system degradation beyond fan issues.

Normal CC operating temperature should be 20-30°C above ambient; higher values suggest airflow problems

Reset CC thermal parameters

Perform CC controller parameter reset via Service menu → CC Reset → Thermal Monitoring Reset, then monitor for alarm recurrence.

Parameter reset may temporarily disable thermal protection - monitor temperatures closely during testing

CC controller recalibration

If alarm persists, initiate CC internal calibration sequence through Service technician menu to recalibrate thermal monitoring circuits.

Calibration requires stable ambient temperature - perform during normal shop temperature conditions

Measure fan supply voltage

Using digital multimeter, measure DC voltage at fan connector terminals while CC controller is powered and operational.

Typical CC fan operates on 24VDC ±10% - voltages below 21V will cause speed reduction

Check CC power supply output stability

Monitor CC internal power supply voltages via TNC diagnostics menu → CC Status → Power Supply Monitoring for voltage fluctuations or drift.

Voltage ripple >5% indicates power supply capacitor degradation requiring replacement

Inspect fan power connections

Examine fan connector pins and wiring harness for corrosion, loose connections, or damaged conductors that could cause voltage drop.

Clean connections with appropriate contact cleaner only - avoid petroleum-based solvents

CC power supply replacement evaluation

If voltage irregularities persist, schedule CC power supply module replacement with HEIDENHAIN service technician.

Power supply issues often affect multiple CC functions - document any other intermittent alarms for technician reference

Monitor cabinet ambient temperature

Measure electrical cabinet internal temperature near CC controller using calibrated thermometer during normal machine operation.

CC controllers typically require <40°C ambient for proper operation - higher temperatures reduce cooling efficiency

Check cabinet ventilation system

Inspect cabinet cooling fans, air filters, and ventilation paths for blockages or failures that reduce cabinet air circulation.

Blocked cabinet filters can cause rapid temperature rise - check filter condition monthly

Evaluate cabinet heat load

Assess total heat generation from all cabinet components and compare to cabinet cooling capacity specifications.

Heat load increases over time as components age - original cooling may be inadequate for current conditions

Implement additional cooling measures

Install supplementary cabinet cooling, relocate heat-generating components, or improve cabinet ventilation design to reduce CC ambient temperature.

Consider heat exchanger systems for harsh environments where filtered air cooling is insufficient