Fanuc Parameter 8901 Better |best| Jun 2026

Check Parameter 1401 (bit 6). Your machine may lack the "AICC II" option. Fanuc sells this as a paid software option (DNC operation or High-speed machining package). If you haven't purchased the option, the machine will alarm. You cannot "hack" 8901=2 without the license.

Always consult the specific machine manufacturer's maintenance manual as parameter functions can differ between models (e.g., Series 0i-TD, 16i-18i-21i).

: While the bypass is active, check the structural temperatures manually. Keep cabinet doors firmly latched to maintain designed airflow paths, or use an auxiliary external shop fan to circulate ambient air over the control fins if necessary.

: Avoid the temptation to use this parameter adjustment entirely by maintaining spare FANUC internal cooling fans in your maintenance crib. They are inexpensive, easy to swap out, and eliminate the need to edit internal control parameters in the first place. fanuc parameter 8901 better

Would you like a step-by-step procedure to change 8901 on your specific Fanuc model (e.g., 0i-D, 31i-B5) or a sample PMC ladder modification to remove the deceleration dog input?

While useful in a pinch, using 8901 to bypass a fan alarm is a calculated risk. It literally involves disabling a safety mechanism to keep production moving. This should only be done in environments where the urgency of output genuinely outweighs the potential for hardware damage. Prolonged operation without active fan cooling will result in system failure, which is significantly more expensive and disruptive than the downtime required to change a fan.

Knowing these specifics allows for tailored instructions on checking hardware diagnostics. Share public link Check Parameter 1401 (bit 6)

: Turn the machine's mode selection switch to MDI .

Always test with an air cut and a thread go/no-go gauge after changing. And remember: Parameter 8901 is write-protected (requires PWE = 1) and often requires a to take effect.

While provides a temporary workaround to get a machine running by shielding the 701 Fan Alarm , it is not a permanent solution. A truly "better" machine operates with a properly functioning cooling system. Use this parameter only for emergency situations and prioritize replacing the faulty fan to avoid catastrophic amplifier failures. If you're interested, I can: If you haven't purchased the option, the machine will alarm

Move your cursor to PWE, press the (OPRT) soft key, change the value from , and press INPUT . Note: The machine will display a non-critical "PWE Alive" alarm. Ignore this for now. Step 2: Navigate and Edit Parameter 8901 Press the SYSTEM function key.

: Return to the SETTING screen and switch PARAMETER WRITE back to 0 . Press RESET to clear the PWE warning message. ⚖️ Risks vs. Benefits: Achieving Better Efficiency

Setting Parameter 8901 to activates AICC Mode II (or Advanced Preview Control). Here is why this is objectively better for 90% of milling operations: