280-0843

Check Hydraulic Pressure

Navigate to MOD function and check machine parameters MP7440-MP7449 for hydraulic pressure values. Verify system pressure meets minimum 40-50 bar requirement.

Ensure machine is in safe state before checking hydraulic system

Test Clamping Solenoids

Access PLC diagnostics via Setup > General > Software Options > PLC and manually activate wheelhead release solenoids. Monitor valve response and pressure drop.

Listen for audible valve switching - absence indicates electrical or mechanical valve failure

Inspect Hydraulic Fluid

Check hydraulic reservoir level and fluid condition. Replace if contaminated or below minimum level. Verify filter condition in hydraulic return line.

Use only manufacturer-specified hydraulic fluid grade

Check Position Sensor Status

Navigate to Setup > Touch Probe > Calibrate and verify wheelhead position sensors. Check machine parameters MP6250-MP6259 for sensor configuration and status bits.

Use oscilloscope to verify clean 24V switching signals from proximity sensors

Verify Sensor Mounting

Physically inspect wheelhead position sensors for proper mounting distance (typically 2-4mm gap). Clean sensor faces and check for mechanical damage or contamination.

Power down spindle drive before sensor inspection

Test Sensor Switching Points

Manually rotate wheelhead while monitoring PLC inputs in diagnostic screen. Verify each position sensor switches cleanly at correct mechanical positions.

Document actual switching positions and compare to machine parameter settings

Visual Inspection of Wheelhead

Remove wheelhead covers and inspect for debris, damaged tool holders, or worn cam followers. Check for proper clearances around rotating components.

Lock out spindle power and ensure wheelhead is stationary before inspection

Manual Wheelhead Rotation Test

With hydraulic pressure off, attempt manual rotation of wheelhead. Check for binding, excessive play, or irregular movement at each tool position.

Mark wheelhead position before manual movement to ensure proper repositioning

Lubrication System Check

Verify automatic lubrication system operation for wheelhead bearings and cam mechanisms. Check machine parameter MP7350 for lubrication cycle timing.

Increase lubrication frequency temporarily if mechanical binding is suspected

Verify Wheelhead Parameters

Check machine parameters MP6240-MP6249 for wheelhead configuration. Verify tool pocket count, rotation direction, and position angles match physical wheelhead setup.

Compare current parameters with machine documentation or backup parameter file

Reset PLC and Clear Alarms

Perform PLC reset via Setup > General > Reset and clear all active alarms. Restart automatic mode and test wheelhead operation with simple tool change.

Save current PLC state before reset in case rollback is needed

Check Timing Parameters

Verify machine parameters MP6260-MP6269 for wheelhead movement timing. Ensure adequate delays for mechanical movement and sensor stabilization.

Increase timing parameters by 20% if intermittent issues occur during rapid tool changes