Fanuc Parameter 8901 Better Guide
Understanding and Troubleshooting Fanuc Parameter 8901 Fanuc parameter 8901 is a critical maintenance setting used to manage fan-related alarms, specifically on newer Fanuc controls like the Series 0i-MC/TC and 0i-MD/TD. When a cooling fan fails or begins to overheat, the system triggers ALM 701, which can halt production. Understanding how to use parameter 8901 allows maintenance teams to bypass this alarm temporarily to keep machines running while awaiting replacement parts. What is Fanuc Parameter 8901?
How to Change Fanuc Parameter 8901 (Safely)
If you’ve decided to make Fanuc Parameter 8901 better, follow these steps carefully. Note: Changing this parameter will affect all active and future tool offsets. Plan this change during a downtime or between jobs. fanuc parameter 8901 better
Step 3: Set Parameter 1821 (Reference position) as usual. 1717 (Maximum allowable deviation): Set to 50 to
Step 2: Adjust Tolerances (Parameters 1717 & 1718)
- 1717 (Maximum allowable deviation): Set to 50 to 100 (microns) for roughing. Set to 10 for finishing. A lower number increases accuracy but slows feedrate.
- 1718 (Angle for deceleration): Set to 45 (degrees). This tells the machine to slow down for corners sharper than 45 degrees.
- Parameter 5002 (bit 6): Controls how wear offsets behave on the minus side. Set this to match your 8901 logic.
- Parameter 5013: Adjusts the limit for tool offset entry. A “better” setup often uses a smaller limit to prevent fat-finger errors.
Related Parameters: Often used in conjunction with other parameters to manage machine status and errors, with similar parameter structures sometimes acting as locks for special functions. Important Considerations: Parameter 5002 (bit 6): Controls how wear offsets
. This "shields" or disables the alarm, allowing the machine to continue running even if a fan signal is missing. When to Use It Emergency Troubleshooting : If your machine is down due to a
. If a fan fails or runs too slowly, the system will trigger , often halting the machine to prevent overheating. Value 1 (Bypass): Fan motor error is not detected