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Check parameter 1801#0 (synchronous control enable) and parameters 8201-8208 (master/slave axis definitions). Navigate SYSTEM > PARAM > search 1801 and 8201. Identify which axis is master and which is slave.

Review the active part program at the line where alarm occurred. Verify no direct motion commands (address codes like X, Y, Z, A, B, C) are programmed for the slave axis. Only program the master axis when synchronous control is enabled.

If slave axis motion is required independently, insert M-code to disable synchronous control (custom macro or parameter 1801#0=0) before commanding slave axis, then re-enable after operation completes.

Disabling synchronous control during machining operations may cause gantry racking or tandem axis desynchronization. Use only during setup or non-critical moves.

Clear alarm, return to program start or safe line before synchronous section, and restart cycle with corrected program containing only master axis commands.

Check parameter 1801#0 and confirm synchronous control is currently enabled. Navigate SYSTEM > PARAM > 1801. If bit 0 = 1, synchronous mode is active.

Verify operator was attempting to manually move the slave axis. Check DIAGNOSIS > CURRENT > AXIS POSITION display to identify which axis was selected on the manual pulse generator or jog panel.

Instruct operator to select the master axis for all manual movements when synchronous control is enabled. The slave axis will automatically follow the master based on parameters 8201-8208 synchronization ratio settings.

If independent slave axis positioning is required, temporarily disable synchronous control via parameter 1801#0 = 0, perform manual operation, then re-enable. Clear alarm with RESET key and verify axis positions match before resuming.

Manual independent movement of slave axis requires careful position verification to prevent mechanical binding or collision in gantry/tandem configurations.

Check DIAGNOSIS > PARAMETER > #3001 (reference position return completion flags). Navigate SYSTEM > DIAGNOSIS > #3001. Bits correspond to each axis - verify both master and slave axes show reference position established (bit = 1).

If either master or slave axis shows reference not established, perform manual reference return. Select JOG or HANDLE mode, select master axis, and execute reference return procedure (+direction to dog, then slow return). Parameter 1815 controls synchronized reference return behavior.

Verify parameter 1815#0 (synchronized reference return enable). If set to 1, both master and slave return together during manual reference. If 0, each axis requires individual reference return which should not be used in synchronized control.

Parameter 1815#0 should typically be set to 1 for gantry/tandem systems to maintain synchronization during reference return.

After successful manual reference return of synchronized axes, clear alarm with RESET, restart program from beginning or appropriate line, and G28 automatic reference return will now execute without alarm.