In FANUC Series 30i, 31i, and 32i controls, parameter 1860 plays a vital role in managing rotary axis A-type operations with absolute position detectors.
must be set to 1 to activate absolute encoder feedback. Parameter 1815.5 (APC) is set to 1 .
If Parameter 1860 is too :
For maintenance engineers, setup technicians, and CNC programmers, a deep understanding of Parameter 1860 is essential for reliable homing, preventing overtravel alarms, and optimizing cycle times. This article provides an exhaustive examination of Parameter 1860—its function, setup, troubleshooting, and advanced considerations.
When setting up or re-establishing reference points on a FANUC-controlled machine, parameters 1860 and 1861 are often cleared as part of the procedure. A typical workflow follows these steps: fanuc parameter 1860
The PMC (Programmable Machine Controller) can override reference return speed in some custom cycles. Check ladder rungs referencing address G100 (reference return speed selection). If PMC forces a different speed, Parameter 1860 becomes secondary.
Before making any modifications, ensure you have a complete backup of all CNC parameters. This allows quick restoration if problems arise. In FANUC Series 30i, 31i, and 32i controls,
A: Yes, on Robodrill with Fanuc 31i-B5. Default is typically 1200 for BT30 spindles.
If you change Parameter 1860, always verify the status of Parameter 1815 right next to it to ensure your zero points remain valid. If Parameter 1860 is too : For maintenance
| Parameter | Function | Relationship with 1860 | |-----------|----------|------------------------| | | Rapid traverse speed (G00) | Must be > 1860. High-speed approach uses 1420 until dog detection. | | 1424 | Manual feedrate (JOG) | Independent, but 1860 is automatically used during JOG reference return. | | 1430 | Maximum cutting feedrate (G01) | Clamps 1860 if 1860 > 1430 (alarm occurs). | | 1850 | Grid shift amount | No direct speed relationship, but both affect final reference position. | | 1851 | Reference position shift (fine) | Fine offset after grid detection; 1860 influences repeatability of this shift. | | 1006#5 (ZMIx) | Reference return direction | 1860 speed applies in the direction set by ZMI. | | 1815#4 (APZx) | Reference position establishment | APZ must be set after tuning 1860. |