280-084E

Check Current Tool Status

Press MOD key and check the spindle status display. Verify if any tool is currently active and note the tool number shown.

The spindle display will show 'T0' or blank if no tool is selected

Examine NC Program Tool Calls

Open the active NC program and search for TOOL CALL statements. Verify the tool number exists and the syntax is correct (e.g., 'TOOL CALL 1 Z S1000').

Ensure you're checking the correct program block where the alarm occurred

Verify Tool Table Entry

Access tool table via MOD → Tool Table or press TOOL key. Check that the called tool number exists and has valid length/radius compensation values.

Tool table entries with negative or extremely large values can cause validation failures

Execute Proper Tool Call

Insert or correct the TOOL CALL statement in MDI mode or edit the program. Use format: TOOL CALL [tool_number] Z S[spindle_speed].

Access Tool Management

Press TOOL key to enter tool table. Check the STATUS column for the problematic tool - it should not show 'L' (locked) or have invalid data.

Use PgUp/PgDn to navigate through all tool entries efficiently

Validate Tool Parameters

Check LENGTH (L), RADIUS (R), and RADIUS2 (R2) values. Ensure no fields contain invalid characters or extreme values that exceed machine limits.

Tool length values exceeding Z-axis travel limits will cause validation errors

Reset Tool Status

If tool shows locked status, highlight the tool row and press CTRL+L to unlock, or change STATUS field from 'L' to blank.

Check machine parameter MP7440 for automatic tool locking conditions

Reload Tool Table

Save changes with ENT key, then cycle power to TNC or use PLC function to reload tool management data.

Check Current Spindle Mode

Verify spindle mode in the status display. Check if control is in milling mode (M3/M4) or turning mode, and confirm compatibility with selected tool type.

Some TNC controls show spindle mode in the header line of the screen

Verify Tool Type Definition

In tool table, check the TOOL TYPE field. Ensure milling tools (types 0-99) aren't used in turning operations and turning tools (types 100+) aren't used in milling.

Incorrect tool type assignments can damage both tool and workpiece

Switch Operating Mode

If tool type is correct, switch spindle mode using appropriate M-codes (M3/M4 for milling, M144/M145 for turning) or change to correct operating mode.

Check machine parameter MP7420 for valid tool type ranges in each mode

Check ATC Status

Access PLC status screen (MOD → PLC) and check tool change related markers. Look for ATC fault indicators or incomplete tool change sequences.

Common PLC markers: M4000-M4099 typically handle tool change functions

Verify Tool Presence

Manually inspect spindle to confirm tool is properly seated. Check tool presence sensors and proximity switches for proper operation.

Ensure spindle is stopped and locked before manual inspection

Reset Tool Change System

Execute ATC reset sequence through PLC or use M6 with current tool number to re-initialize tool change system recognition.

Some systems require M0 followed by manual tool change confirmation

Calibrate Tool Sensors

If problem persists, check and calibrate tool presence and length measurement sensors according to machine manufacturer specifications.

Access Machine Parameters

Press MOD key, select 'Machine Parameters', and navigate to MP74xx series parameters related to tool management.

Only modify machine parameters if you have proper authorization and backup

Check Tool Validation Parameters

Verify MP7440 (tool monitoring), MP7441 (tool type checking), and MP7450 (maximum tool number) are set correctly for your machine configuration.

Document original parameter values before making any changes

Restore Default Settings

If parameters appear corrupted, restore from backup or contact machine manufacturer for default parameter set specific to your machine model.