75250

Verify tool table path: Navigate NCK → Diagnosis → Tool Management. Check SD43200 (TOOL_MAGAZINE parameter) points to correct tool table file location (typically /nc/d/toolfile.def). Confirm file exists and is readable.

Do not modify tool table while machine is in automatic mode or program is running.

Inspect tool offset entries: Access Tool Editor (HMI: Program → Tool → Tool Offsets). Verify the T-number called in NC program exists with complete data: tool length (DL), tool radius (DR), orientation angle (LORT), and tool type field populated. Empty or zero-filled offset records cause interpolation failure.

Reload tool table: From HMI Machine menu, select 'Load Tool Table' or use PLC interface (DB410 TOOL_CHANGE). Verify reload completes without error messages. Check channel working memory: Diagnostics → Channel Data → Tool Parameters for consistency.

Ensure no tool change operation is in progress before reloading.

Cross-reference tool orientation: Check NC program tool call (T-value, M6). Access Machine Data: NCK → Machine Data → Axis Configuration. Verify MD21000 lists all required axes (e.g., X, Y, Z, A, B). Confirm tool offset orientation (LORT) in tool table matches configured axis frame (typically LORT=0 for standard XYZ orientation).

Validate tool offset vector assignment: In Tool Offsets, confirm DL (length) and DR (radius) are assigned to correct axes per MD21050 (AXCONF_MACHAX_USED_FOR_DRESSING). Misalignment between tool offset axes and actual machine axes causes parameter mismatch during servo interpolation.

Machine Data changes require expert knowledge; incorrect axis assignment may cause collision or unsafe tool motion.

Perform channel initialization: From Diagnostics, select Channel Reset (soft reset, no power cycle). This reloads all axis-tool relationships from Machine Data and Tool Table. Re-run the NC program; if alarm persists, escalate to axis configuration review.

Review alarm detail in Diagnostics: Select Alarm → 75250 → Extended Info. Note the specific tool number and parameter that failed validation. Cross-reference tool table entry and check for decimal point errors, unit mismatches (mm vs. inches), or truncated values.

Validate parameter ranges: Access Machine Data MD42400 (TOOLCOMP_TOOL_LENGTH_MIN/MAX) and MD42410 (TOOLCOMP_TOOL_RADIUS_MIN/MAX). Edit tool table entry to ensure DL and DR values fall within these ranges. Confirm units match machine configuration (MD18000 SCALING_FACTOR).

Incorrect unit conversion can result in out-of-range tool offsets; verify machine unit system before editing.

Re-save tool table and perform Tool Table reload (see previous cause block, step 3). Verify NC program T-number references corrected tool offset. Run program in DRY-RUN or JOG mode first to confirm alarm clears.