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Check Compressor Output Pressure

Verify compressor tank pressure gauge reads 120+ PSI. Check that compressor cycles on at 100 PSI and off at 120 PSI.

Ensure compressor is properly grounded and electrical connections are secure before inspection.

Inspect Air Regulator Setting

Locate main air regulator feeding machine. Adjust to 100-110 PSI output. Verify regulator gauge accuracy with calibrated gauge.

Most Haas machines require 6 CFM minimum at 100 PSI for proper tool changer operation.

Test Compressor Recovery Time

Cycle tool changer manually using MDI T1 M06 command. Monitor how quickly compressor recovers pressure after tool change cycle.

Recovery time over 30 seconds indicates compressor capacity issues.

Check Compressor Maintenance Status

Inspect air filter, drain moisture from tank, check belt tension. Replace filter element if dirty or clogged.

Drain tank pressure before removing filter elements or performing maintenance.

Perform Soap Bubble Test

Apply soapy water solution to all pneumatic fittings, hoses, and connections from main supply to tool changer. Look for bubbling indicating leaks.

Start testing at highest pressure points and work toward tool changer components.

Check Tool Gripper Cylinders

Access DIAGNOSTICS > INPUTS/OUTPUTS screen. Monitor air pressure while manually actuating tool gripper using M21/M22 commands.

Ensure no tools are in gripper before testing gripper operation.

Inspect Carousel Rotation Cylinder

Check pneumatic cylinder that rotates carousel for external leaks at rod seals and port connections. Test using M16 carousel rotation command.

Carousel cylinder leaks often occur at rod seal due to contamination from coolant splash.

Test System Hold Pressure

Shut off air supply and monitor pressure gauge. System should hold 90+ PSI for 10 minutes minimum without significant drop.

Restore air supply before attempting any machine operations.

Verify Actual System Pressure

Install calibrated pressure gauge at tool changer pneumatic manifold. Compare reading to pressure switch activation point (typically 80 PSI).

Use gauge with 0.5% accuracy or better for reliable diagnosis.

Check Pressure Switch Signal

Access DIAGNOSTICS > INPUTS/OUTPUTS > INPUT SIGNALS. Locate pneumatic pressure input signal and verify it changes state at correct pressure threshold.

Do not adjust pressure switch settings without consulting machine documentation.

Test Switch Hysteresis

Slowly reduce system pressure while monitoring input signal. Note pressure where signal changes state. Increase pressure and verify switch resets properly.

Proper hysteresis should be 5-10 PSI between on/off points to prevent chattering.

Inspect Switch Connections

Check electrical connections at pressure switch for corrosion, loose terminals, or damaged wiring. Verify continuity to NGC control input.

Power down machine before checking electrical connections.

Locate Air Preparation Unit

Find filter/regulator/lubricator (FRL) unit in pneumatic supply line. Check pressure gauges before and after filter assembly.

Pressure drop across clean filter should be less than 2 PSI at normal flow rates.

Inspect Filter Element

Remove filter bowl and examine element for contamination, oil saturation, or physical damage. Replace if discolored or clogged.

Relieve air pressure before removing filter bowl to prevent injury.

Check Automatic Drain Operation

Verify automatic moisture drain cycles properly. Manually actuate drain valve and check for proper water/oil discharge.

Drain should activate every 30 seconds during operation or based on moisture level.

Test Flow Rate After Service

After filter service, verify adequate flow by timing tool change cycle. Normal cycle should complete in 3-6 seconds depending on machine model.

Ensure all filter components are properly seated before restoring full pressure.