Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Basic · 10-20 minutes

Alarm 14800

Siemens 840D 14800 - Channel block programmed path speed less or equal to zero

A negative F value has been programmed in conjunction with the G functions G93, G94, G95 or G96. The path velocity may be programmed in the range 0.001 to 999 999.999 [mm/min, mm/rev, deg/min, deg/rev] for the metric input system and 0.000 1 to 39 999.999 9 [inch/min, inch/rev] for the inch input sy

Siemens SINUMERIKServo/AxisBasic10-20 minutes

14800

Siemens 840D 14800 - Channel block programmed path speed less or equal to zero

Channel block programmed path speed less or equal to zero

A negative F value has been programmed in conjunction with the G functions G93, G94, G95 or G96. The path velocity may be programmed in the range 0.001 to 999 999.999 [mm/min, mm/rev, deg/min, deg/rev] for the metric input system and 0.000 1 to 39 999.999 9 [inch/min, inch/rev] for the inch input sy

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Negative feedrate value entered in NC program (F parameter with minus sign)
  • Incorrect G-code syntax mixing incompatible feed modes with invalid speed values
  • Program copied or edited with negative sign accidentally introduced before F value
  • Post-processor error generating negative feedrate in exported NC code
  • Feedrate parameter outside valid range (≤0 or exceeds maximum)

Troubleshooting Steps

  1. 1Review the NC program at the specified block number and verify all F values are positive and within range 0.001-999999.999 mm/min (metric) or 0.0001-39999.9999 inch/min (inch)
  2. 2Check that G93, G94, G95, or G96 commands are properly formatted and not conflicting with feedrate syntax
  3. 3Search entire program for negative F values using editor find function and correct to positive equivalents
  4. 4Verify post-processor settings if program was generated by CAM software, ensure feedrate output is positive
  5. 5Test corrected program with dry run (M0 or reduced feedrate) before resuming full execution

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Always verify with your machine manual or a certified technician before performing service procedures.