FAI4 台应急柴油发电机(EDG)因服务水泵控制电源变压器选型偏小，在降压工况下接触器无法可靠吸合，被整体宣布不可用；设计变更未核算替换接触器更高涌流对控制电源变压器的影响
1998 年 MCC 改造设计错误，未核算替换接触器涌流对控制电源变压器选型的影响；Extent-of-condition 还发现 EDG 机房通风风机同隐患
The mechanism code FAI shown on this card is the KB's internal damage-mechanism abbreviation (not an ISO 14224 code); it describes how the equipment failed. The 'ISO 14224 Mapping' block above maps it to the correct ISO functional failure code (which describes what the equipment failed to do) — these are two distinct dimensions in ISO 14224. The mechanism follows the narrative in the card body.
bearing_inner_race_defect轴承外圈缺陷 bearing_outer_race_defect滚动体缺陷 bearing_ball_defect定子绕组绝缘老化 stator_winding_insulation_aging定子绕组匝间短路 stator_winding_turn_short转子断条 rotor_bar_broken转子不平衡 rotor_unbalance轴不对中 rotor_misalignment过热绝缘烧毁 overheating_insulation_burn润滑脂劣化 lubrication_grease_degradation润滑油污染 lubrication_oil_contamination冷却风扇失效 cooling_fan_failure接线盒端子松动 terminal_box_loose_connection基础松动振动大 vibration_excessive_foundation轴电流电蚀 bearing_current_erosionGear-tooth Pitting gear_tooth_surface_pitting齿根疲劳断裂 gear_tooth_root_fatigue_crack齿面磨粒磨损 gear_tooth_wear_abrasive齿面胶合/擦伤 gear_tooth_scuffing齿轮箱轴承内圈缺陷 gb_bearing_inner_race_defect齿轮箱轴承外圈缺陷 gb_bearing_outer_race_defect不对中齿面偏载 gear_misalignment_tooth_load润滑油降解 gb_lubrication_oil_degradation润滑油污染 gb_lubrication_oil_contamination密封泄漏漏油 seal_leak_oil联轴器不对中 coupling_misalignment箱体裂纹 housing_crack键槽剪切失效 keyway_shear共振 vibration_resonanceIGBT 功率模块失效 igbt_power_module_failure直流母线电解电容老化 dc_bus_capacitor_aging冷却风扇失效 cooling_fan_failure控制板/固件死机复位 control_board_firmware_crash共模电压致电机轴承电蚀（轴电流） harmonic_bearing_current参数漂移/误整定误跳车 parameter_drift_spurious_trip输入整流桥二极管失效 rectifier_diode_failure直流母线过压（再生能量未泄放） dc_bus_overvoltage输出侧电缆/绕组绝缘因 dv/dt 退化 output_cable_insulation_degradation散热器热阻升高（积灰/导热硅脂老化） heat_sink_thermal_resistance_rise接地故障检测误动/拒动 ground_fault_protection_nuisance与 DCS/SIS 通讯中断 communication_loss柜体环境腐蚀/凝露 enclosure_environment_corrosion预充电电路失效 precharge_circuit_failureFTS fail_to_start带载失败 fail_to_accept_load冷却系统失效 cooling_failure润滑油系统故障 lube_oil_failure燃油污染/含水 fuel_contamination启动蓄电池失效 starting_battery_failure超速 overspeed电压调节器故障 voltage_regulator_fault排气阻塞 exhaust_restriction异常振动 vibration_abnormal增压器失效 turbocharger_failure控制系统故障 edg_control_fault