代碼 421: SERVO ALARM: n AXIS EXCESS ER (D)
問題描述與安全警告
Fanuc 16i/18i/21i CNC 觸發了嚴重的 SERVO ALARM: n AXIS EXCESS ER (D) 警報。需要由合格的操作員或維修技師立即處理，以防止在製造週期中對設備造成二次損壞或導致零件報廢。在接觸電氣控制箱之前，請務必確保遵循標準安全和停機掛牌 (LOTO) 程序。
官方故障排除步驟
The difference between the errors in the semi–closed loop and closed loop has become excessive during dual position feedback. Check the values of the dual position conversion coefficients in parameters No. 2078 and 2079.
Source: Fanuc Series 16i/18i/21i-B Operator's Manual, Appendix G Alarm List (B-63864EN/03)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
關於 Fanuc 16i/18i/21i CNC 警報
由 Fanuc 製造的工業控制器具有廣泛的診斷系統，用於保護內部電路和機械連桿。當 16i/18i/21i CNC 出現類似 421 的錯誤代碼時，通常表示指令值與實際感測器回饋之間存在不匹配。
完整警報清單: 360 Fanuc 16i/18i/21i CNC 代碼s.
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