1749

Check limit switch status

Navigate to DIAGNOSIS screen and check tailstock quill limit switch inputs. Look for LS1 (quill retracted) and LS2 (quill extended) status indicators.

Ensure tailstock is in safe position before manual inspection

Manually actuate switches

With machine in emergency stop, manually press each limit switch while observing the diagnosis screen. Switches should change state reliably.

Use a small screwdriver to gently actuate switches - avoid excessive force

Clean and adjust switches

Clean switch actuators and mounting surfaces. Adjust switch position if necessary to ensure proper actuation by quill movement.

Power off machine before adjusting switch positions

Test quill operation

Clear alarm and test tailstock quill extend/retract cycles to verify proper limit switch operation and alarm clearance.

Check position feedback signals

In DIAGNOSIS screen, monitor tailstock quill position feedback values during manual quill movement. Look for erratic readings or no signal change.

Position values should change smoothly and consistently with quill movement

Inspect sensor connections

Check all connections to the quill position sensor, including power supply and signal cables. Look for loose connections, damaged cables, or corrosion.

Use proper ESD precautions when handling sensor connections

Clean sensor and scale

Clean the linear scale/encoder and reading head with appropriate cleaner. Remove any chips, coolant residue, or contamination from the sensor area.

Verify sensor alignment

Check that the sensor reading head maintains proper gap and alignment with the scale throughout the full quill travel range.

Check pressure readings

Monitor hydraulic/pneumatic pressure gauges for tailstock system. Verify pressure meets specification (typically 4-6 bar for pneumatic systems).

Do not exceed maximum pressure ratings shown on system labels

Inspect pressure switches

Check pressure switch status in DIAGNOSIS screen. Pressure switches should indicate adequate pressure when system is pressurized.

Check for air/fluid leaks

Inspect all pneumatic/hydraulic lines, fittings, and cylinders for leaks. Listen for air leaks or look for hydraulic fluid drops.

Test pressure relief valve

Verify pressure relief valve is not stuck open or set too low, causing pressure loss in the tailstock system.

Review tailstock parameters

Access PARAMETER screen and review tailstock-related parameters, particularly quill stroke limits, timing parameters, and condition monitoring settings.

Compare current parameters with machine documentation or backup parameter file

Check stroke limit settings

Verify quill stroke limit parameters match the actual physical travel limits of the tailstock quill assembly.

Adjust timing parameters

Review and adjust quill operation timing parameters if they are too restrictive for current mechanical condition of the tailstock.

Reset condition monitoring

Clear any learned condition values and allow the system to re-establish baseline condition monitoring parameters.