504

Press SYSTEM > PARAM and check parameter 1324 for the axis indicated in the alarm (n-th axis). Verify the positive limit value matches machine specifications and required working envelope.

Check parameter 1320 bit 3 (STL3) to confirm stored stroke check III is enabled. If enabled but limit is incorrect, record current machine position from POSITION screen (ABSOLUTE coordinates).

Compare parameter 1324 value with parameters 1320 (stroke check enable bits), 1322 (stored stroke check III negative limit), and 1326/1327 (stored stroke check I/II limits) to ensure no conflicts.

Parameter write enable (PWE) must be set via parameter 0000 bit 0 before modifying parameters

If limit needs adjustment, modify parameter 1324 to appropriate value based on machine manufacturer specifications. Reset alarm, return axis to safe position, and verify operation.

Never exceed physical machine travel limits or manufacturer specifications when setting software limits

Navigate to POSITION screen and check MACHINE coordinates vs WORKPIECE coordinates for the affected axis. Identify which work offset is active (G54, G55, etc.).

Press OFFSET/SETTING > WORK and review the work coordinate system offset values (parameters 1220-1227 for G54-G59). Verify the offset for the n-th axis is correct.

Check external workpiece zero offset parameter 1250 and additional work offset settings. Review program for G92 (work coordinate system setting) commands that may shift the coordinate system.

Correct the work offset values or modify G92 settings in the program. Reset alarm using RESET button, manually jog axis to safe position, and re-run program verification.

Ensure tool and workpiece positions are safe before resuming operation after coordinate system changes

Navigate to SYSTEM > DIAGNOSIS and check diagnosis numbers 300-303 (servo error for each axis) and 400-403 (absolute position for each axis). Note any abnormal values for the n-th axis.

Check ALARM > HISTORY screen for recent servo alarms (400-series) or position errors. Verify parameter 1815 (absolute position detector selection) and diagnosis 4113 (Ai absolute encoder battery voltage if equipped).

Perform reference point return (zero return) operation for the affected axis using manual mode. Navigate to POSITION screen and confirm reference point position indicator appears correctly.

Ensure area is clear and axis can safely move to reference position before executing zero return

If reference point is lost or encoder issue suspected, check servo amplifier LED status codes, verify encoder cable connections, and review parameter 1815 settings. Re-establish reference point and verify position accuracy.

If absolute encoder battery is low (diagnosis 4113 shows voltage below 3.0V), replace battery and re-establish reference point immediately