: Maintenance experts recommend using this setting only for short periods while implementing forced air cooling
Press the soft key to view the CNC system parameters.
Press the softkey on the bottom edge of the screen to reveal the parameter settings page.
: Bypassing the hardware lock lets you manually jog the machine axes to a safe clearing or home position, making it much easier to perform physical maintenance. fanuc parameter 8901 better
1 System fan, 701 alarm, 8901#0 parameter is changed to 1 to temporarily shield the alarm (OIC system); Dongguan Jide Precision Machinery Technology Co., Ltd. How to Enable Parameter Write Enable (PWE) on a Fanuc CNC
However, always pair this adjustment with proper AICC configuration, appropriate acceleration limits (parameter 1735), and the right precision level for your application. The best results come from a — test, measure, adjust, and repeat.
. 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. : Maintenance experts recommend using this setting only
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.
Optimizing FANUC Parameter 8901: A Guide to Managing System Fan Alarms
The remaining 15 bits of parameter 8901 (bits #1 through #15) define a numeric value — the number of NC program blocks the control will read ahead and analyze before executing them. This look-ahead capability is at the heart of modern high-speed machining (HSM). When the controller sees a long series of short movement blocks (common in 3D surface finishing programs), it computes an optimal speed profile that accelerates and decelerates intelligently rather than forcing the machine to stop at every block boundary [20†L5-L6]. 1 System fan, 701 alarm, 8901#0 parameter is
Modifying parameters on modern controls requires caution and proper procedure. Follow this technical workflow to adjust your configuration through the FANUC MDI panel : Step 1: Switch to MDI Mode and Enable PWE
If you are cutting a precision 45-degree chamfer and need to open the diameter by 0.001", 8901 = 1 ensures the TNR comp algorithm adjusts correctly. With 8901 = 0, you may see unexpected deviations on angles and radii.
is a critical bit-type setting configured within the CNC software to monitor hardware diagnostics. Its primary function relates directly to the internal cabinet cooling infrastructure, focusing heavily on the system's upper cooling fans.