What (e.g., 0i-MD, 31i) are you currently working on? Share public link
“See?” she said, pointing. “The battery backup glitched. The amplifier forgot the offset. It thinks the rotor is 338 electrical degrees away from where it actually is. The servo is trying to correct a ghost.”
When a FANUC-controlled rotary axis is homed, the system records the machine position where the reference point is established. This positional data is stored in two parameters:
Understanding Parameter 1860 helps field technicians prevent position drift and alignment alarms during continuous multi-axis machining operations. Technical Definition and Core Function fanuc parameter 1860
What prompted you to look into Parameter 1860? Which axis are you attempting to calibrate or synchronize? Share public link
Incorrect settings inside Parameter 1860 can result in several standard Fanuc system errors. 1. APC Alarms (Alarm 300 series)
Understanding FANUC Parameter 1860: The Key to Multi-Axis Synchronization What (e
: If the backup battery dies, the absolute position is lost. Parameter 1860 may reset or become invalid, requiring a manual re-homing procedure to re-establish the relationship between the physical machine position and the digital value.
Type 1815 and press (Number Search) to go directly to Parameter 1815. Locate the axis you want to change (e.g., Z-axis). Change Bit 4 (APZ) from 1 to 0 .
Parameter 1860 specifically applies this logic to or sub-spindle/main-spindle alignments depending on your exact FANUC model and option configuration. It ensures that Axis B (the slave or synchronized axis) mirrors or aligns perfectly with Axis A (the master axis) relative to the machine's physical geometry. Why Adjust Parameter 1860? The amplifier forgot the offset
“We’re going to talk to the motor directly,” she said. “Bypass the controller. Ask it where its soul is.”
Press the (Offset/Setting) hard key on the MDI panel. Press the SETTING soft key. Move the cursor to PARAMETER WRITE (PWE). Change the value from 0 to 1 (or select ON ).
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. FANUC Series 0i-MODEL F PARAMETER MANUAL - Drivesul
If the feedback direction phase within the encoder parameters is inverted, the motor will spin out of control the moment the brakes release.