503

Navigate to SYSTEM > PARAM and check parameter 1323 for the affected axis (n). Verify the negative limit value matches machine mechanical limits and application requirements.

Compare parameter 1323 with parameter 1320 (Stored Stroke Check I negative limit). Parameter 1323 should typically be equal to or slightly beyond 1320 to act as a secondary boundary.

Check bit 0 of parameter 1300 (bit 0 = Stored Stroke Check II enable). If enabled but limits are not properly set, disable this check temporarily or correct the limit values.

Disabling stroke check removes safety protection. Only disable for diagnostic purposes and re-enable after correction.

After correcting parameter 1323, perform a controlled test move approaching the negative limit while monitoring POSITION > ABSOLUTE display to verify proper limit enforcement.

Navigate to DIAGNOSIS > PARAMETER > #300-#3nn series to check current absolute position for the affected axis. Compare with actual mechanical position and POSITION > ABSOLUTE display for discrepancies.

Check DIAGNOSIS > SERVO > diagnoses #200 (position deviation) and #201 (current position error) for the affected axis. Large unexpected values indicate feedback problems.

For absolute encoder systems, check alarm history for battery low alarms (BAT, 1815, 1816). If battery alarms present, establish reference position at a known mechanical location using SYSTEM > PMC > REF POS or manual reference return.

Performing reference position establishment will reset the machine's positional reference. Ensure axis is at a safe known location.

Inspect encoder cables and connectors at the motor and amplifier for damage, contamination, or looseness. Check servo amplifier LEDs for error codes indicating encoder communication faults.

Press RESET to clear the alarm and note the axis position at alarm trigger. Navigate to POSITION > ABSOLUTE and POSITION > MACHINE to identify current location relative to machine zero.

Review the active program line at alarm occurrence (PROGRAM > CURRENT display). Check commanded position values and active work coordinate system (G54-G59). Navigate to OFFSET SETTING > WORK to verify offset values are not placing working envelope beyond parameter 1323 limit.

Check for active external workpiece offset or fixture offset values in parameters 1400-1404 series that may be adding to coordinate shifts, pushing movements outside stored stroke limits.

Perform a dry run in single block mode with feed rate override at minimum to test the suspect program section, monitoring POSITION displays to confirm commanded positions remain within parameter 1323 boundaries.