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Check Sensor Status in Diagnostics

Press CURRENT COMMANDS, then DIAGNOSTICS. Navigate to I/O and check inputs for Parts Catcher Extended and Parts Catcher Retracted sensors.

Sensors should show opposite states - when one is ON, the other should be OFF

Inspect Sensor Physical Condition

Open electrical cabinet and visually inspect proximity sensors on parts catcher cylinder. Clean sensors with compressed air and check mounting distance.

Lock out main power before opening electrical cabinet

Test Sensor Response

Manually cycle parts catcher using MDI commands M15/M16 while monitoring sensor status in diagnostics to verify proper switching.

Sensors typically need 2-4mm gap from target surface for reliable operation

Replace Faulty Sensors

If sensors don't switch properly, replace the faulty proximity sensor and verify proper wiring connections to the control.

Use only Haas-approved replacement sensors to ensure proper voltage and timing characteristics

Inspect Catcher Movement

Visually observe parts catcher operation during M15 (extend) and M16 (retract) commands, looking for slow or jerky movement.

Normal cycle time should be 2-3 seconds for full stroke

Check Air Pressure Supply

Verify shop air pressure is 80-100 PSI at the machine. Check air filter/regulator assembly for proper pressure and clean filter element.

Never exceed 100 PSI as this can damage seals and create unsafe conditions

Clean and Lubricate Mechanism

Clean debris from catcher rails and pivot points. Apply light machine oil to pivot points and slide surfaces per Haas maintenance manual.

Use way oil or light machine oil - avoid heavy grease which attracts chips

Check Cylinder and Fittings

Inspect pneumatic cylinder for air leaks at fittings and rod seal. Tighten fittings and replace cylinder if internal leakage is detected.

Support parts catcher weight when disconnecting air lines to prevent dropping

Verify Parts Catcher Enable Parameter

Press SETTINGS, then PARAMETERS. Check Parameter 311 - should be set to 1 if parts catcher is installed and operational.

Parameter 311 set to 0 disables parts catcher but may still trigger alarms if sensors are active

Check Timeout Parameters

Review parameters related to parts catcher timing. Verify timeout values are appropriate for your specific parts catcher model and air pressure.

Only modify parameters if you have the original machine parameter list for reference

Reset to Factory Defaults

If parameters appear corrupted, load factory default parameters from SETTINGS > PARAMETERS > RESTORE, then reconfigure machine-specific settings.

Always backup current parameters before restoring defaults using SETTINGS > PARAMETERS > BACKUP

Test Parameter Changes

After parameter changes, cycle power and test parts catcher operation with M15/M16 commands to verify proper function.

Some parameter changes require power cycle to take effect

Check Control Cabinet Connections

Inspect terminal strips and connectors in electrical cabinet for parts catcher sensor wiring. Look for loose, corroded, or damaged connections.

Lock out main power and verify zero energy state before working in electrical cabinet

Test Sensor Voltage

Using multimeter, verify 24VDC supply voltage at sensor connections and check sensor output voltage when activated.

Proximity sensors typically output 22-24VDC when activated, near 0VDC when not activated

Inspect Field Wiring

Trace wiring from sensors to electrical cabinet, checking for damage from chips, coolant, or mechanical wear along cable routing.

Pay special attention to areas where cables flex during machine operation

Repair or Replace Damaged Wiring

Replace damaged cables or repair connections using proper electrical techniques. Ensure all connections are tight and properly insulated.

Use only machine-rated cable appropriate for the environment and voltage requirements

Identify Input Card Location

Locate the input card in the NGC control cabinet that handles parts catcher sensor inputs. Consult electrical drawings for specific card position.

Input cards are typically labeled and have LED indicators for each input channel

Check Input Card LEDs

Observe LED indicators on input card while manually activating parts catcher sensors. LEDs should illuminate when sensors are triggered.

Only qualified technicians should work inside the control cabinet with power applied

Test with Known Good Signal

Apply a known good 24VDC signal to the suspected input terminals to verify if the input card can register the signal.

Use a jumper wire from 24VDC supply to input terminal for testing

Replace Input Card

If input card fails to respond to test signals, replace with Haas-approved replacement card and transfer all wire connections.

Power must be off when replacing input cards. Document wire positions before removal