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FANUC commonly used parameters in maintenance
FANUC systems are equipped with numerous machine parameters, offering significant convenience for the installation, commissioning, and routine maintenance of CNC machines. Based on extensive practical experience, this article introduces the application of commonly used machine tool parameters in maintenance scenarios.
1. **Hand Pulse Generator Failure**: In a FANUC 0TD CNC lathe, the hand pulse generator malfunctioned, preventing precise tool adjustment. At the time, no spare parts were available. To address this, parameter 900#3 was set to "0," allowing the use of the manual pulse generator via the jog button for fine-tuning. Once the hand pulse generator was repaired, the parameter was reset to "1."
2. **Overtravel Alarm During Reference Point Return**: After powering on, an overtravel alarm (510 or 511) occurred during reference point return. Two solutions were available:
- If the X-axis triggered the alarm, adjust parameter 0700LT1X1 to +99999999 (or 0704LT1X2 to -99999999) and retry the reference point.
- Alternatively, press the P and CAN keys simultaneously while powering on to clear the alarm.
3. **ALM701 Overheat Alarm**: On a FANUC 0i CNC lathe, ALM701 appeared shortly after startup, indicating overheating of the control unit fan. Upon inspection, the fan motor was not running, but the power supply was normal, so the fan was damaged. To temporarily bypass the alarm, set parameter RRM8901#0 to "1." The machine was cooled using strong airflow until a replacement fan could be installed, at which point the parameter was reset to "0."
4. **Spindle Tool Change Noise**: In a FANUC 0M machining center, an abnormal noise occurred during tool change when the spindle contacted the tool arm. Analysis revealed inaccurate spindle positioning, leading to mechanical collisions. No mechanical looseness was found, so parameter N6577 was adjusted from 1525 to 1524, resolving the issue.
5. **Parameter Transmission for Dense Parameters (0900–0939)**: Inputting dense parameters like 0900–0939 in MDI mode is cumbersome. A more efficient method involves:
- Switching to EDIT mode.
- Pressing the PARAM button to access the parameter screen.
- Setting the external device to STAND BY.
- Pressing EOB followed by OUTPUT to send all parameters.
6. **Lost Reference Points Due to Battery Failure**: In a FANUC 0MC vertical machining center, a failed absolute position battery caused X, Y, Z axes to lose their reference points. Steps to restore them included:
- Changing PWE to "1" and setting parameters 76.1=1, 22=00000000.
- Manually returning each axis to its reference point.
- Reconfiguring parameter 22 to confirm the reference points.
- Finally, verifying the reference points using G28 X0 Y0 Z0.
7. **No Alarm, But Display Issues**: A FANUC 18i-W machine displayed inaccurate axis positions after startup, with four decimal digits instead of three. This was traced to parameter 0000#2 being set to "1" (imperial input). Resetting it to "0" restored normal display.
8. **Fan Alarm Bypass**: When a machine fan alarm occurred and a replacement was delayed, parameter 8901 could be modified to disable the alarm temporarily. Once the fan was replaced, the parameter was reverted.
9. **System Key Lock and Parameter Protection**: Parameter PAR3208#1 can lock the SYSTEM KEY if protection settings are not changed. To unlock, set PAR3292#7 to "1." Protection program parameters include PAR3202.
These examples demonstrate how understanding and properly configuring FANUC machine parameters can significantly aid in troubleshooting and maintaining CNC equipment efficiently.