1322

Check Motor Overload Status

Navigate to CURRENT COMMANDS > I/O and check the conveyor motor overload input status. Look for the conveyor thermal overload bit to be active.

Ensure main power is locked out before accessing electrical components

Reset Motor Overload

Locate the conveyor motor starter in the electrical cabinet and manually reset the thermal overload relay by pressing the reset button on the motor starter.

Allow 10-15 minutes cooling time before resetting if motor is hot to touch

Check Motor Current Draw

Use a clamp meter to measure motor current during operation. Compare against nameplate amperage - excessive current indicates mechanical binding or motor issues.

Take current readings on energized circuits with proper PPE

Inspect Conveyor Mechanism

Check for chips jamming the conveyor, damaged conveyor belt, or seized conveyor drive components causing excessive motor load.

Remove accumulated chips and lubricate conveyor drive points per maintenance schedule

Verify Contactor Operation

Navigate to CURRENT COMMANDS > I/O and manually activate the conveyor output. Listen for contactor engagement and verify auxiliary contact feedback changes state.

Only qualified personnel should work inside electrical panels with power on

Check Contactor Coil Voltage

Measure voltage across the conveyor motor contactor coil when the NGC control commands conveyor start. Should read 120VAC or 24VDC depending on system configuration.

Check for loose wire connections on contactor coil terminals

Test Auxiliary Contacts

With contactor energized, verify auxiliary contacts provide proper feedback signal to the control. Check continuity and voltage levels at the feedback input terminals.

Verify proper lockout/tagout procedures before testing contacts

Replace Faulty Contactor

If contactor coil tests good but contacts are burned or pitted, replace the entire contactor assembly with Haas-approved replacement part.

Take photos of wire connections before removal to ensure proper reconnection

Check Motor Circuit Fuses

Locate and test all fuses in the conveyor motor circuit using a multimeter. Replace any blown fuses with exact amperage rating specified in electrical drawings.

Turn off main power before removing or testing fuses

Inspect Motor Connections

Check all wire connections at the motor junction box, motor starter, and control cabinet terminals. Look for loose, corroded, or burned connections.

Use torque specifications from electrical drawings when retightening connections

Test Motor Winding Continuity

Disconnect motor leads and test each winding for continuity and proper resistance values. Check for shorts to ground using a megohmmeter if available.

Ensure motor is completely disconnected before resistance testing

Verify Control Wiring

Trace and test the conveyor control wiring from the NGC I/O board to the motor starter, checking for damaged cables or loose terminal connections.

Reference the electrical schematic to identify proper wire numbers and terminal locations

Check I/O Status Display

Navigate to CURRENT COMMANDS > I/O and verify the conveyor motor output can be manually toggled and that feedback inputs respond appropriately to external signals.

Compare I/O status with actual field device states to identify discrepancies

Test Output Voltage Levels

Measure voltage at the I/O board output terminals when conveyor is commanded on. Should read appropriate voltage level (typically 24VDC) per electrical specifications.

Use proper test equipment rated for the voltage levels being measured

Verify Input Signal Integrity

Apply known good signals to the conveyor feedback input terminals and verify the NGC control properly recognizes the input state changes.

Use a signal generator or jumper wires to simulate proper feedback signals

Contact Haas Technical Support

If I/O board testing indicates internal failure, document all test results and contact Haas technical support for I/O board replacement procedures and part numbers.

Do not attempt I/O board replacement without proper ESD protection and Haas authorization

Perform Motor Insulation Test

Using a megohmmeter, test motor winding insulation to ground. Readings below 1 megohm indicate winding damage requiring motor replacement.

Ensure motor is completely disconnected and discharge any residual voltage before testing

Check Motor Shaft Rotation

With power disconnected, manually rotate the motor shaft to check for bearing seizure or internal mechanical damage. Shaft should turn smoothly with minimal resistance.

Listen for grinding or rough bearing sounds during manual rotation

Test Motor Windings

Measure resistance across each motor winding and compare to nameplate specifications. Significant deviation indicates winding damage.

Allow motor to cool to ambient temperature before taking resistance measurements

Replace Defective Motor

If motor tests indicate internal failure, replace with exact Haas part number or equivalent motor meeting same specifications for voltage, current, and mounting configuration.

Mark wire positions before disconnecting to ensure proper reconnection of new motor