推荐回答（4个）
III电梯通讯故障的故障代码为F，有若干条故障码，凌云-III电梯系统P1板的故障提示是滚动提示的，主板的通讯分为轿厢CAN通讯链，大厅CAN通讯链，群控通讯链，如果通讯链上出现故障，P1板数字状态显示系统将提示故障码FXX，其后缀子码分别提示故障的实际出现部件和区域，我们必须记录下所有的故障码进行综合分析，分析器出现故障的主要根源故障码，其他故障码是由主故障码所导出的。
一、其分析及判断的方法，应该考虑以下几个方面
1) CAN通讯链上的部件与器件是否异常或损坏，
2) CAN 通讯链上的供电电源（12伏开关电源）是否电压异常或损坏。如有异常，更换开关电源，轿厢通讯开关电源设置在轿厢内操纵箱内，厅外及群控通讯电源设置在控制柜中，按照子码所指涉及部件予以确认。
3) CAN通讯链的终端电阻是否异常，按照子码所涉及部件予以确认，确认轿厢通讯、井道通讯，群控通讯的终端。
4) 用万用表直流电压档测量CAN通讯链上，CAN-H 和CAN-L的电压是否异常，通常CAN-H与12伏开关电源-V之间的电压大约在直流2.5伏左右，CAN-L12伏开关电源-V之间的直流电压大约2.0伏左右，CAN-H 与CAN-L之间的直流电压为+0.5伏左右，如果测量中发现异常，必须逐一确认CAN 通讯链上所有子站的电子部件是否异常或损坏，更换异常的相关电子部件，直至测量的直流电压正常。
二、附通讯故障子码表
F3D 后门 IC 故障， F3C 前门 IC 故障， F3B 后门 BC1 故障， F3A 前门 BC1 故障， F39 秤故障， F38 后门 DC 故障， F37 后门 CS 故障， F36 前门 DC 故障， F35 前门 CS 故障， F34 SC 故障 ， F31 P1CL 故障， F48 后门 DC 故障 ，F47 后门 CS 故障， F46 前门 DC 故障， F45 前门 CS 故障 ， F44 SC 故障， F41 P1CL 故障， F5B 后门 BC4 故障， F5A 后门 BC3 故障， F59 后门 BC2 故障， F58 后门 BC1 故障， F57 前门 BC4 故障， F56 前门 BC3 故障， F55 前门 BC2 故障， F54 前门 BC1 故障 ，F53 后门 IC 故障， F52 前门 IC 故障， F51 HS 故障。
旋转P1板上的“MON1”调到0的位置“MON0”调到0的位置 故障显示“E" 0 无故障1 逆变侧2 整流侧3 整流侧4 电源5控制盘6控制盘7 外部安全回路8 门9 升降开关A抱闸 曳引机B速度控制选层器C秤DP1基板E系统设置F通讯故障
请教三菱LEHY-II小故障显示F51是什么原因？
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