Parameter 8901 Better Repack — Fanuc

Go to the SETTING screen, find PARAMETER WRITE , and set it to 1 . You will see a "P/S 100" alarm, which is normal when editing parameters.

| Method | Repeatability | Maintenance | Speed | Thermal Stability | |--------|---------------|-------------|-------|-------------------| | Dog + grid (8901.0=0) | ±5–10 µm | High (dog wear) | Slow | Poor (dog changes with temp) | | Dogless (8901.0=1, bits 4&7=1) | ±0.5–1 µm | None | Fast | Excellent (direct to encoder) |

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

Before leaving this topic, ensure you have these best practices committed to memory: fanuc parameter 8901 better

Set Parameter 1850 (Grid Shift amount) to a small positive integer, e.g., 20 (pulses). With 8901.0=1, this value now represents a fine offset from the index pulse rather than from the dog.

The path to "better" FANUC operation involves a clear set of priorities:

Technicians typically use this parameter as a . If a replacement fan is not immediately available, setting 8901#0 to 1 allows you to clear the alarm and finish a critical job. Critical Warnings: Go to the SETTING screen, find PARAMETER WRITE

If you're a Fanuc CNC user looking to take your machining capabilities to the next level, I highly recommend exploring parameter 8901. With its range of customizable functions and potential for improved performance, this parameter is sure to deliver significant benefits for your machining operations.

The CNC system monitors the upper control unit cooling fan. If the fan slows down or stops, the CNC triggers ALM701 (Fan Motor Overheat) and halts all operations to protect the internal circuit boards.

Input and press the INPUT soft key. The machine will safely flash a SW0100 PARAMETER WRITE ENABLE message. Ignore this alert for now. Step 2: Navigate to Parameter 8901 Before leaving this topic, ensure you have these

Do change 8901 from default if:

Ask any experienced setup machinist or programmer about Parameter 8901, and you will likely get a passionate debate. Some see it as a safety feature; others view it as a productivity killer. The industry is now shifting toward a consensus:

It is generally used to set the detection state of the cooling fans, specifically for the main cabinet or Servo/Spindle amplifiers.

: Locate the PARAMETER WRITE field, move your cursor over it, and change the value from 0 to 1 . The machine will output a non-critical PWE warning alarm; this is normal.