If you lose your home position (e.g., after a battery failure), you must re-synchronize Parameter 1860. You can find detailed technical guidance in the official PARAMETER MANUAL . A typical reset involves: Enabling Parameter Write (PWE = 1) .
If your machine has the Two-Stage Backlash Acceleration option (often an option that must be purchased and enabled by the machine tool builder or FANUC), then Parameter 1860 will likely function as the first-stage acceleration value. You can confirm this by checking the relevant bit parameters: fanuc parameter 1860 work
When you command a spindle to a specific orientation (say, M19 at 0 degrees), the spindle motor’s built-in position coder (pulse coder or encoder) sends feedback to the FANUC drive. Parameter 1860 provides a to correct any systematic deviation between the encoder’s zero position and the physical zero point of the spindle. If you lose your home position (e