PS0026

Press PRGRM key and review the program block causing the alarm. Check if G01, G02, or G03 is commanded without an F word in that block or any preceding blocks after program start (O-number line).

Insert a valid F word (e.g., F100 for mm/min or F0.004 for mm/rev) in the first cutting move block or before it. Ensure the F value is appropriate for the active G94 (feed per minute) or G95 (feed per revolution) mode.

Check parameter 3402 bit 6 (FCV). If set to 1, F words are treated as inverted time feed and require specific formatting. Verify this matches your programming intent.

Reset the alarm with RESET key, return to program start (PRGRM > cursor to top > ORIGIN), and restart execution in MEM or AUTO mode.

Navigate to SYSTEM > PARAM and check parameter 3401 bit 4 (M30). If set to 0, M30 clears modal information including F word. Verify your program re-establishes F after each M30/M02 or cycle start.

If using subprograms (M98/M99), ensure the F word is defined in the main program before calling the subprogram, or define it within the subprogram itself before any cutting moves.

Review CURRENT COMMANDS screen (POS > soft key until CURRENT COMMANDS displays) to verify modal F value. If F shows 0 or blank, the feedrate must be programmed.

Edit the program to include an F word after program start (O-number) and before the first G01/G02/G03 command. Reset alarm and restart program execution.

Navigate to SYSTEM > PARAM and verify parameter 1401 (maximum cutting feedrate) is set to a reasonable value (e.g., 10000 for mm/min). If set to 0, the control may reject feedrate commands.

Changing parameter 1401 affects machine safety limits. Consult machine builder specifications before modification.

Check parameter 1420 (FL: rapid traverse rate) and ensure it is not interfering with cutting feedrate modal storage. Verify G01 mode is active, not G00, when PS0026 occurs.

Review parameter 3450 (feedrate unit setting). Ensure the F word units in your program match the parameter setting (0=mm/min or inch/min, 1=mm/rev or inch/rev depending on bit configuration).

If parameters were recently modified, restore from a known-good parameter backup via SYSTEM > PMC > I/O > LOAD or consult machine documentation for default parameter settings. Reset alarm and test program execution.

Parameter restoration will overwrite all current parameter settings. Back up existing parameters first via SYSTEM > PARAM > PUNCH output.