If your axis moves away from the zero-return switch instead of toward it, check if Parameter 1860 needs to be accompanied by a change in Parameter 4006 (or individual axis direction parameters).
A common mistake made by technicians attempting to shift an axis home position (e.g., trying to adjust a Z-axis tool change height) is typing a new number directly into Parameter 1860.
Fanuc Parameter 1860 stores the absolute encoder pulse count for each axis, which is crucial for resolving 300 APC alarms caused by lost positional data, often due to dead batteries. Fixing the alarm involves replacing the batteries, setting Parameter 1815 (bit 4) to 1, and re-establishing the physical home position to automatically update Parameter 1860. For detailed instructions, you can read the Practical Machinist discussion and CNCmakers technical support . CNC Fanuc Resetting home position After switching batteries fanuc parameter 1860 full
FANUC, a renowned Japanese company, is a leading manufacturer of industrial robots, CNC machines, and other automation solutions. In the realm of CNC machining, FANUC's control systems are widely used for their precision, reliability, and flexibility. One crucial aspect of FANUC's control systems is the parameter setting, which allows users to customize and optimize the machine's performance. In this article, we will delve into the specifics of FANUC parameter 1860, exploring its significance, functions, and configuration.
The reference position is not established . The machine does not know its absolute zero, and you will likely see a "Need ZRN" (Zero Return) alarm or a 300-series absolute pulse coder alarm. If your axis moves away from the zero-return
Before making changes, perform a full parameter backup to an SRAM card or USB stick.
Official documentation, such as the Fanuc Parameter Manual , warns that these low-level servo parameters are "intellectual property" of the manufacturer and should not be modified without expert knowledge. Misconfiguring these can lead to "illegal servo parameter" alarms or, worse, mechanical crashes. Fixing the alarm involves replacing the batteries, setting
Modifying servo parameters can alter how a machine reacts in an emergency. Follow these precise steps to safely access and change Parameter 1860 on a standard FANUC 16i, 18i, 21i, or 0i series control: Step 1: Enable Parameter Writing (PWE) Ensure the machine is in mode. Press the [OFFSET/SETTING] function key on the MDI panel. Press the [SETTING] softkey at the bottom of the screen. Locate the item PARAMETER WRITE (PWE) .
Move the machine axis manually (using the handwheel/jog) to its true, physical home location or alignment marks. Go back to Parameter 1815 and change to 1 . Phase 3: Finalize and Verify Power cycle the CNC machine.