If you truly want the behavior, combine 8901 with Parameter 4000#2 = 1 (high-speed rigid tapping mode) on 31i-B5 controls.
Press the key on the key panel. The 701 Fan Alarm should now disappear from your active window. The Hidden Risks of Leaving 8901 Enabled Long-Term
In Fanuc CNC systems, is typically associated with Servo Guide or Manual Guide i software functionality , specifically relating to the display of graphical monitoring data . While parameters in the 8000+ range often deal with software options and macro settings, 8901 is commonly used to enable or configure the tracing/graphics window. Key Applications of Parameter 8901
If you must use Parameter 8901 to clear a 701 alarm, employ these safety measures to minimize hardware damage: fanuc parameter 8901 better
Parameter 8901 works hand-in-hand with AICC/AIAPC (AI Contour Control / AI Advanced Preview Control). These technologies share the look-ahead buffer size defined by 8901 but add advanced trajectory planning algorithms [17†L9-L10]. For users with newer 0i-F or 31i systems, AICC I (G05.1 Q1) and AICC II are standard high-speed high-precision features [17†L6-L8]. FANUC explains: "AICC II is mainly oriented towards continuous small-segment mold processing and NURBS-based interpolation" [20†L10-L11].
A medical device manufacturer running Swiss-type lathes (Fanuc 31i-B5). The Problem: Setup times were 90 minutes per job. Operators constantly fought offset double-counting when changing worn inserts. Scrap rate due to taper errors was 3%.
Modifying parameters on a FANUC control screen requires accessing the System Parameters via Manual Data Input (MDI) mode. Follow this sequence precisely: If you truly want the behavior, combine 8901
. Under normal factory operations, when an internal cooling fan on the FANUC CNC control unit fails, slows down, or gets blocked, the system automatically triggers a 701 Fan Alarm and halts production. By changing Parameter 8901 Bit 0 from 0 to 1 , operators can mask this fault code to clear the alarm screen and temporarily resume machine movements.
Setting allows the system to "shield" or suppress this alarm. While this can be a temporary "better" workaround to keep a machine running during a critical job, it is generally considered a maintenance risk. Key Functionality of Parameter 8901
To make Fanuc Parameter 8901 better , most experienced programmers recommend setting it to . Here is why this setting is superior for the majority of modern CNC turning operations. The Hidden Risks of Leaving 8901 Enabled Long-Term
Modifying internal settings requires activating on your display. Follow this sequence carefully to implement the change:
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: Once the replacement physical fan is mounted and powered, immediately toggle Parameter 8901 Bit 0 back to 0 . This step ensures your control system remains protected against future unexpected airflow blockages. Alternative Maintenance Realignment
Move the cursor to the rightmost bit (Bit 0). Change it to 1 to bypass or 0 to enable.