231-8002

Access controller diagnostics

Navigate to MOD function → Service → Controller diagnostics to view current fan RPM values and compare against nominal specifications.

Document baseline fan speeds during preventive maintenance for trending analysis

Perform visual and auditory inspection

Power down system and inspect CC controller fan for bearing noise, wobble, or visible wear. Check for smooth rotation when manually spun.

Ensure proper lockout/tagout procedures before accessing electrical enclosures

Replace cooling fan assembly

Install genuine HEIDENHAIN replacement fan with matching voltage and CFM specifications. Verify proper connector engagement and cable routing.

Replace fan filters simultaneously to maximize new fan lifespan

Verify alarm clearance

Power up system and monitor fan RPM in controller diagnostics. Confirm alarm 231-8002 clears and fan speed remains within normal operating range.

Inspect air intake filters

Remove and examine all intake filters on the CC controller enclosure. Check for clogging, oil saturation, or physical damage that restricts airflow.

Use appropriate PPE when handling contaminated filters in machining environments

Clean fan blades and housing

Use compressed air and appropriate solvents to remove accumulated debris from fan blades, housing, and heat sink fins. Ensure complete removal of cutting fluid residue.

Clean in direction opposite to normal fan rotation to avoid blade damage

Replace air filters

Install new filters with correct micron rating for your machining environment. Ensure proper sealing to prevent bypass airflow.

Consider upgrading to higher-efficiency filters in high-contamination environments

Test airflow restoration

Power up and verify improved fan performance through controller diagnostics. Monitor for sustained RPM within normal operating parameters.

Measure fan supply voltage

Use calibrated multimeter to verify DC voltage at fan connector matches nameplate specifications (typically 12V or 24V DC). Check both static and loaded conditions.

Measure voltage at the fan connector, not just the power supply output

Inspect electrical connections

Examine fan power connector, cable integrity, and terminal connections for corrosion, looseness, or heat damage. Check continuity through cable harness.

Verify power isolation before disconnecting electrical connections

Test power supply performance

Evaluate CC controller internal power supply under load conditions. Check ripple voltage and regulation within HEIDENHAIN specifications.

Power supply degradation often affects multiple subsystems simultaneously

Replace faulty power components

Replace defective power supply module or repair connection issues. Verify proper voltage regulation and fan speed recovery after repairs.

Monitor enclosure temperature

Check ambient temperature inside electrical cabinet using calibrated thermometer. Compare against HEIDENHAIN environmental specifications (typically 0-45°C operating).

Take measurements at multiple locations and times to identify heat sources

Evaluate cabinet ventilation

Assess overall enclosure cooling system including intake fans, exhaust fans, and air circulation patterns. Verify proper heat exchanger operation if equipped.

Ensure adequate clearance around enclosure for proper air circulation

Improve thermal management

Implement additional cooling measures such as upgraded cabinet fans, heat exchangers, or air conditioning. Relocate heat-generating components if possible.

Consider thermal barriers between high-heat components and the CC controller

Verify temperature stability

Monitor CC controller temperature through diagnostics menu over extended operating periods to confirm thermal improvements are effective.