231-6810

Check reference point status

Navigate to MOD function and check the reference point status display. Look for missing reference marks or error indicators on the affected axis.

Press CTRL+R to quickly access reference point information

Perform manual reference run

Execute a manual reference point approach using the reference point menu. Select the affected axis and initiate reference run sequence.

Ensure axis can move freely and no obstacles are present before starting reference run

Verify reference point establishment

After successful reference run, check that the position display shows correct absolute coordinates and the reference point indicator is active.

Compare current position with expected machine zero position from setup documentation

Access machine parameters

Navigate to MOD function, select machine parameters, and locate MP1410.x and MP1411.x for the affected axis (where x is axis number).

Only modify machine parameters if you have proper authorization and backup

Compare limit values with switch-off position

Check that the switch-off position falls within the range defined by MP1410 (negative limit) and MP1411 (positive limit). Record current values before making changes.

Use the position display to determine current axis position relative to limits

Adjust software limits if necessary

If limits are incorrect, modify MP1410/MP1411 to accommodate the valid switch-off position. Ensure adequate safety margins are maintained.

Incorrect limit settings can cause machine crashes - verify with machine documentation

Reset control and test

Perform a control reset (CTRL+ALT+DEL) to activate new parameters and verify alarm clears during startup sequence.

Check limit switch status

Navigate to the PLC status display and monitor limit switch inputs while manually moving the axis. Verify switches activate at correct positions.

Use the diagnostic screen to view real-time I/O status

Inspect limit switch hardware

Physically examine limit switches for damage, contamination, or misalignment. Check mounting brackets and actuator mechanisms.

Lock out machine power before performing physical inspection

Test switch continuity

Using a multimeter, verify electrical continuity of limit switch circuits. Check for proper voltage levels and clean connections.

Typical limit switch voltage should be 24VDC - consult electrical drawings for specifics

Check encoder diagnostics

Access the servo diagnostics menu and review encoder status for the affected axis. Look for signal quality indicators and error counters.

EnDat encoders provide detailed diagnostic information in the servo status display

Verify encoder mounting

Inspect encoder coupling and mounting for mechanical damage or looseness that could cause position errors.

Do not attempt encoder adjustment without proper alignment tools

Clear encoder errors and re-reference

Clear any encoder error flags in the diagnostics menu, then perform a complete reference point sequence to re-establish position correlation.