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RTU common fault analysis table

2022-03-09 18:43:40| | 0
Serial Fault phenomenonPossible causes of failureterms of settlement
1Communication failure(1) Whether the RTU station address is inconsistent with the address set by the central station;(1) Reset the address;
(2) RTU does not work normally;(2) Replace RTU;
(3) The antenna direction of RTU radio station is not pointing to the central station;(3) Adjust the antenna;
(4) The radio station is not working properly.(4) Replace the radio station.
2Low communication success rate (large channel interference)(1) The feeder is not connected properly;(1) Connect the feeder;
(2) Large electromagnetic interference near RTU;(2) Avoid interference;
(3) RTU has no good ground wire.(3) Grounding.
3Communication succeeded, but the data is 0(1) The instrument has no output;(1) Check the instrument;
(2) The central station configuration is inconsistent with the RTU instrument channel;(2) Calculate the correct coefficient;
(3) Fault of RTU data acquisition part;(3) Check the input interface.
4The communication is successful, but the data is inconsistent with the field instrument(1) Instrument full scale;Bottom number: (12): 800;
(2) Setting of base number and coefficient of central station configuration;Coefficient: instrument full scale / RTU AI full scale.
(3) Incorrect reference voltage;
(4) The input type of AI is inconsistent with the instrument;
5The communication is successful, but the data jumps(1) Feeder interference;(1) Parallel capacitance;
(2) Large electromagnetic interference near RTU (such as frequency converter);(2) Avoid interference sources;
(3) AC power line interferes with 4 ~ 20mA signal.(3) Separate the wiring.
6RTU crash(1) RTU watchdog, imperfect software and hardware designField reset
(2) High electromagnetic interference near RTU
(3) RTU without good ground wire
7Output inoperative(1) The controlled equipment is damaged and the output electrical surge;(1) When receiving inductive load (such as motor or relay), it is necessary to use a suppression circuit;
(2) Loose or incorrect wiring;(2) Check the wiring. If it is incorrect, correct it;
(3) Output overload;(3) Check the load rate of power supply and output;
(4) There is a problem with the communication cable;(4) Check whether the CPU of PLC is forced;
(5) Station address setting error.(5) Reset the station address; Check the communication cable.


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