FANUC codes
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FANUC Controller

Program/G-code · Intermediate · 30-60 minutes

Alarm 337

Fanuc Alarm 337 - EXCESS MAXIMUM INCREMENTAL VALUE

Fanuc Alarm 337 occurs when a single incremental move command (G91 mode or incremental axis specification) exceeds the maximum allowed travel distance set by parameter 1320. This is a malfunction prevention feature to catch programming errors or incorrect manual data input that could cause dangerous machine movements or crashes.

FANUCProgram/G-codeIntermediate30-60 minutes

337

Fanuc Alarm 337 - EXCESS MAXIMUM INCREMENTAL VALUE

SYSTEM ALARM 337

Fanuc alarm 337: SYSTEM ALARM 337. This alarm indicates a fault condition detected by the Fanuc control. Refer to the alarm number and name to identify the specific system or function involved.

Root Cause Summary

Fanuc Alarm 337 occurs when a single incremental move command (G91 mode or incremental axis specification) exceeds the maximum allowed travel distance set by parameter 1320. This is a malfunction prevention feature to catch programming errors or incorrect manual data input that could cause dangerous machine movements or crashes.

Causes and Fixes

  1. 1

    Check parameter 1320 (Maximum Incremental Value) via SYSTEM > PARAM > [#1320]. Note the value in machine units (typically 0.001mm or 0.0001inch). A typical setting is 999999 representing 999.999mm or similar.

  2. 2

    Review the NC program line number shown with the alarm on the CRT. Look for G91 incremental commands or incremental axis designations (U, V, W, C, etc.) that exceed parameter 1320 value.

  3. 3

    Common errors include: missing decimal point (X100000 instead of X100.000), wrong unit programming (inch value in metric program), or coordinate system offset errors causing large incremental calculations.

  4. 4

    Correct the program line with proper incremental value, verify decimal point placement matches machine input format, reset alarm with RESET key and restart program.

    Verify corrected move will not cause collision before restarting program

DIY Feasiblehigh confidence

Call a technician if:

  • ·Parameter 1420 changes don't resolve the issue
  • ·Suspected encoder or feedback system problems
  • ·Alarm persists after program and offset corrections

Prevention

  • Regularly audit parameter 1420 settings against machine capabilities
  • Implement program verification procedures before first run
  • Use graphics simulation to validate tool paths
  • Establish standard work coordinate system setup procedures

Common Mistakes

  • Setting parameter 1420 too restrictively
  • Ignoring decimal point placement in G-code
  • Not verifying work coordinate offsets after setup
  • Running programs without graphics verification

Related Alarms

335336338410411

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