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FANUC commonly used parameters in maintenance
FANUC systems are equipped with a wide range of machine parameters, which greatly facilitate the installation, debugging, and routine maintenance of CNC machine tools. Based on extensive hands-on experience, this article introduces the practical 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 fine tool adjustments. As no spare parts were available at the time, parameter 900#3 was set to “0†to temporarily use the manual pulse generator. The jog button’s single-pulse function was used for fine-tuning until the hand pulse generator was repaired and the parameter was reset to “1â€.
2. **Overtravel Alarm During Reference Point Return**
After turning on the machine, an overtravel alarm (510 or 511) occurred during reference point return. Two solutions were applied:
- If the X-axis triggered the alarm, change parameter 0700LT1X1 to +99999999 (or 0704LT1X2 to -99999999), then re-attempt the reference point return.
- 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, an ALM701 alarm 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 deemed faulty. To bypass the alarm temporarily, parameter RRM8901#0 was set to “1â€, allowing the machine to operate under strong cooling. Once a replacement fan was available, the parameter was reverted to “0â€.
4. **Spindle Impact Noise During Tool Change**
In a FANUC 0M machining center, an abnormal impact noise occurred during tool change when the spindle contacted the tool arm. After checking, the issue was traced to inaccurate spindle positioning, causing misalignment with the tool arm. Although the tool changer arm and spindle head showed no mechanical looseness, adjusting parameter N6577 from 1525 to 1524 resolved the issue.
5. **Transmission of Dense Parameters (0900–0939)**
According to FANUC 0MC operating instructions, inputting dense parameters like 0900–0939 via MDI mode is inconvenient. A more efficient method involves:
- Setting the mode switch to EDIT.
- Pressing PARAM to access the parameter screen.
- Putting the external device into STAND BY.
- Pressing EOB followed by OUTPOT to output all parameters.
6. **Lost Reference Points Due to Battery Failure**
A FANUC 0MC vertical machining center lost reference points due to a failed absolute position battery. The following steps were taken:
- Set PWE to “1â€, change parameter 76.1 to “1†and parameter 22 to “00000000â€. This prompted a “300†alarm requiring manual reference point return.
- After restarting, manually move X and Y axes to their reference positions, setting parameter 22 to “00000011â€.
- Move Z-axis near its reference point, install a tool shank, and clamp it manually. Then set parameter 22 to “00000111â€.
- Finally, reset PWE to “0†and verify the reference points using G28 X0 Y0 Z0.
7. **No Alarm, But Inaccurate Display**
A FANUC 18i-W machine displayed inaccurate coordinate values on the CRT, with extra decimal digits appearing without any alarm. This was caused by a parameter change—parameter NO.0000#2 was set to “1†instead of “0â€, switching the system to imperial units. Changing it back to “0†restored normal display.
8. **Fan Alarm Bypass via Parameter Adjustment**
If a fan alarm occurs and a replacement is delayed, parameter 8901 can be modified to disable the alarm temporarily. This allows the machine to start up and run until the fan is replaced. This method applies to FANUC 18, 16, or 0i systems.
9. **Parameter Lock and Unlock**
To prevent accidental changes, parameter PAR3208#1 can lock the SYSTEM KEY. If protection settings need to be adjusted, set PAR3292#7 to “1†to unlock. The protection program parameters include PAR3202.
By understanding and properly applying these machine parameters, technicians can efficiently troubleshoot and maintain FANUC CNC systems, ensuring smooth and reliable operation.