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天津滨海二期车辆运行偶尔出现全车无常用制动力，还经常出现牵引时各级牵引力输出均为最大牵引力，司机按压紧急制动按钮停车，之后通过重新启动编码器电源的方式恢复。造成列车欠标停车和晚点，经过长时间跟踪调查，确定为编码器供电电源受外部干扰所致，为编码器电源增加浪涌抑制器后，该故障现象消除。“,”The Tianjin Binhai Phase II vehicles suffer occasional cases of running without braking force, and there are often happenings of towing traction output levels reaching maximum traction, which requires driver to press emergency stop button, then restart the encoder power supply to resume operation. This has caused train delays and parking not to sign position. After a long-term follow-up survey, the problem is identiifed as external interference on encoder power supply. The problem is solved after installing surge suppressor for encoder power supply.