1241

Power down and lockout machine

Turn main disconnect OFF and follow lockout/tagout procedures before accessing chip conveyor area.

Never attempt to clear jams with power on - rotating auger can cause severe injury

Remove chip pan access covers

Remove the chip pan covers and visually inspect the auger for wrapped chips, long stringy material, or foreign objects blocking rotation.

Use a flashlight to check the entire auger length - jams often occur at the discharge end

Manually clear obstruction

Use chip hooks or pliers to remove wrapped material. Manually rotate auger by hand to verify free movement throughout full rotation.

If auger won't turn by hand, check for bent flights or damaged auger shaft

Test auger operation

Power up machine and test auger using M78 (Chip Auger Forward) command in MDI mode to verify smooth operation before resuming production.

Check Parameter 396 setting

Navigate to SETTING > PARAMETERS and verify Parameter 396 (AUGER CURRENT LIMIT) is set correctly - typically 8-12 amps for standard Haas auger motors.

Factory default is usually 10 amps - don't increase without checking motor nameplate rating

Inspect motor electrical connections

Check auger motor terminal box for loose connections, corrosion, or damaged wiring. Verify all three phases show continuity and proper insulation resistance.

Use proper electrical safety procedures and test equipment when checking motor circuits

Test motor current draw

Use clamp-on ammeter to measure actual motor current during operation. Compare to nameplate rating and Parameter 396 setting.

Current should be balanced across all three phases - imbalance >10% indicates motor or wiring problems

Check motor mechanical condition

With power off, manually check motor shaft for bearing roughness, excessive play, or binding that would increase current draw.

Check jam sensor status in diagnostics

Navigate to DIAGNOSTICS > INPUTS and observe the auger jam sensor input (typically X27) while manually rotating auger to verify sensor operation.

Sensor should toggle ON/OFF as auger flights pass the sensor - no change indicates sensor failure

Inspect sensor mounting and gap

Verify jam sensor is properly mounted with correct gap (typically 1-3mm) to auger flights and not damaged by chips or coolant.

Clean sensor face with non-abrasive cloth - coolant residue can affect proximity sensor operation

Test sensor wiring continuity

Check sensor cable from sensor to control cabinet for cuts, pinches, or corrosion. Verify proper voltage at sensor (typically 24VDC).

Disconnect power before checking wiring connections to prevent short circuits

Replace sensor if faulty

If sensor fails tests, replace with identical Haas part number and adjust gap per service manual specifications.

Inspect auger flight condition

Remove chip pan covers and examine auger flights for excessive wear, cracks, or damage that would reduce chip moving efficiency and increase motor load.

Worn flights have rounded edges and reduced height - compare to new flight specifications in parts manual

Check auger shaft alignment

Verify auger shaft runs true without wobble or binding. Check shaft bearings for wear and proper lubrication.

Support auger weight properly when removing for inspection to prevent injury

Measure auger-to-trough clearance

Check clearance between auger flights and trough bottom - excessive clearance reduces efficiency and increases motor load.

Typical clearance is 3-6mm - adjust trough position or replace worn components as needed

Replace worn components

Replace excessively worn auger flights, damaged shaft, or worn bearings with genuine Haas parts per service manual procedures.

Verify motor nameplate rating

Check auger motor nameplate for correct full load amperage rating and compare to Parameter 396 setting in SETTING > PARAMETERS menu.

Parameter 396 should be set 10-20% above motor nameplate FLA to allow for normal load variations

Review alarm history timing

Check DIAGNOSTICS > ALARM HISTORY to determine if alarms occur during heavy cutting operations or specific material types that generate more chips.

Pattern of alarms during heavy roughing cycles may indicate parameter needs adjustment

Adjust parameter if necessary

If motor and mechanical systems check good, carefully increase Parameter 396 in 1-amp increments while monitoring actual motor current during operation.

Never exceed motor nameplate rating - overload protection is critical for motor life