601

Check Drive Status Display

Navigate to CURRENT COMMANDS > DIAGNOSTICS > ATC STATUS to view drive fault codes and motor current readings.

Normal ATC motor current should be under 3-4 amps during rotation

Manual Carousel Rotation Test

Use MDI mode to execute M06 T1 command and observe carousel movement for binding or unusual noise.

Ensure spindle is clear of workpiece before manual tool change

Inspect Carousel Mechanism

Check carousel bearing races, tool pot alignment, and lubrication. Look for chips or debris causing mechanical resistance.

Use way oil on carousel bearing surfaces, never grease

Drive Reset and Parameter Check

Power cycle machine and verify ATC motor parameters in SETTING 71 (ATC Motor Current Limit) are within specification.

Default ATC current limit is typically 8-10 amps depending on machine size

Check Encoder Signals

Navigate to CURRENT COMMANDS > DIAGNOSTICS > SIGNALS and verify ATC ENCODER A, B, and Z signals are toggling during carousel movement.

Encoder signals should show clean square waves without dropouts

Inspect Encoder Wiring

Check encoder cable connections at both motor and control cabinet. Look for damaged, loose, or corroded connections.

Power down machine before disconnecting encoder cables

Encoder Calibration Check

Access SETTING 73 (ATC Encoder Counts) and verify the value matches machine specification (typically 2048 or 4096 counts per revolution).

Incorrect encoder count setting will cause position errors even with good encoder

Position Reference Reset

Perform ATC home sequence using ZERO RETURN > ATC HOME to re-establish encoder reference position.

Always home ATC after encoder repairs or parameter changes

Check Timeout Parameter

Verify SETTING 72 (ATC Position Timeout) is set correctly - typically 15-30 seconds depending on carousel size.

Larger carousels need longer timeout values, but excessive timeout masks other problems

Monitor Carousel Speed

Time manual tool changes and compare to normal operation. Slow rotation indicates motor or drive issues.

Standard carousel should complete full rotation in 8-12 seconds

Check ATC Motor Speed Setting

Verify SETTING 74 (ATC Motor Speed) is set to manufacturer specification, typically 80-100% for normal operation.

Reducing speed below 70% often indicates underlying mechanical problems

Lubrication and Cleaning

Clean and lubricate carousel bearing surfaces and tool pot mechanisms to reduce mechanical drag.

Use only recommended way oil - grease will attract chips and cause binding

Check Drive LED Status

Examine ATC servo drive LED indicators in electrical cabinet. Red or flashing LEDs indicate specific fault conditions.

Consult drive manual for LED fault code interpretation

Verify Drive Power Supply

Check DC bus voltage and AC input voltage to ATC drive. Measure at drive terminals with multimeter.

High voltage present - use proper PPE and lockout procedures

Drive Parameter Verification

Access drive parameters through service menu and verify motor parameters match ATC motor nameplate specifications.

Incorrect motor parameters can cause drive faults even with good hardware

Drive Reset and Test

Clear drive faults using drive reset function or power cycle, then test with low-speed manual operation.

If drive faults immediately on enable, suspect drive hardware failure

Visual Inspection of Tool Pots

Examine each tool pot for protruding tools, damaged retention knobs, or foreign debris preventing proper indexing.

Ensure spindle is stopped and clear before inspecting carousel

Tool Holder Inspection

Check all tool holders for proper retention knob torque (15-20 ft-lbs) and correct orientation in pots.

Loose retention knobs can shift and cause interference during carousel rotation

Carousel Alignment Check

Verify carousel is properly seated on bearing races and tool pots align correctly with spindle and storage positions.

Misalignment often occurs after maintenance or collision damage

Individual Position Test

Use MDI to command each tool position individually (T1, T2, etc.) to isolate which position causes the fault.

Fault occurring at same tool number indicates problem with that specific pot