603-0282

Check reference point status

Press REF key and verify all axes show valid reference marks. Look for missing checkmarks or question marks in axis display.

Never attempt manual positioning without proper axis referencing

Execute reference point approach

Select Manual Operating mode, press REF key, then press NC Start to reference all axes. Ensure proper sequence per machine configuration.

Some machines require specific axis referencing order - check machine parameter MP7500

Verify position display

After referencing, check position display shows valid coordinates without flashing or error indicators before activating cutting limits.

Check tool change position

Verify tool changer returned to proper position after tool change. Check machine parameter MP7440 for tool change position validity.

Tool change position must be outside all active cutting limit planes

Execute positioning move

In Manual mode, jog axes to establish known position coordinates, or execute G00 move to safe position in MDI mode.

Ensure all cutting limit planes are temporarily disabled during positioning

Reactivate cutting limits

Once valid position is established, reactivate cutting limit planes using G25/G26 commands with proper coordinate definitions.

Review limit plane parameters

Check active G25/G26 definitions in program or setup. Verify coordinate values are within machine travel limits and properly formatted.

Use machine parameter MP1010-MP1050 to verify axis travel limits

Disable cutting limits temporarily

Execute G27 command to cancel all cutting limit planes, then establish valid tool position before redefining limits.

Redefine cutting planes

Program new G25/G26 commands with coordinates that encompass current tool position, ensuring proper clearance values.

Check encoder status

Access Service menu and check encoder diagnostics. Look for position error values exceeding tolerance in machine parameters MP1420-MP1430.

Position errors may indicate mechanical issues requiring immediate attention

Clear position errors

If minor position errors exist, execute controlled stop and re-reference affected axes to restore valid position feedback.

Verify feedback stability

Monitor position display for stable readings without fluctuation before attempting to reactivate cutting limit functions.

Check active transformations

Review active coordinate transformations using PLANE function or check for active G68 rotation commands that may affect position calculation.

Reset coordinate system

Execute PLANE RESET or G69 to cancel active transformations, then establish clear position reference.

Redefine limits in base system

Define cutting limit planes in machine coordinate system before applying any coordinate transformations.