: Navigate the cursor to the far-right bit position (Bit 0). Change the bit value from 0 to 1 and press INPUT .
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
Need help verifying your current Fanuc parameter settings? Consult your machine tool builder’s manual or contact a certified Fanuc service engineer. Always back up your CNC data before modifying parameters.
Operating the machine without proper cooling can cause the electronics to catch fire or fail catastrophically. A Better Approach: Genuine Maintenance fanuc parameter 8901 better
Its primary function is to determine how the control decides where the machine’s reference position (zero return) is after power-up, specifically regarding grid shift calculations and the use (or ignoring) of the deceleration dog (limit switch).
Parameter 8901 defines (also called the "shortcut axis" or "endless axis") and how the CNC handles positioning commands to that axis.
The root cause for accessing 8901 for fan bypass is usually a lack of monitoring. Instead of waiting for the machine to spontaneously throw ALM 701, build a checklist: : Navigate the cursor to the far-right bit position (Bit 0)
Look at the data row. FANUC parameters are written in binary bytes read from right to left (Bit 7 to Bit 0):
Many experienced technicians argue that understanding how to adjust this specific parameter makes troubleshooting and temporary fixes and faster. What is FANUC Parameter 8901?
[MDI Mode] ➔ [SETTING Key] ➔ [PWE = 1] ➔ [SYSTEM Key] ➔ [Search 8901] ➔ [Change Bit 0 to 1] 1. Enable Parameter Write The 701 Fan Alarm should now disappear from
The parameter on FANUC controls (especially Series 0i, 16i, 18i, 21i, and later) is a bit-data type parameter used to define rotation/shortcut axis (RoTary axis) assignment and its related reference position return behavior.
: Eliminates unexpected spindle stops during complex, multi-hour molds or expensive alloy cuts.
