RTU common fault analysis table

2022-03-09 18:43:40| 次| 0次

Serial	Fault phenomenon	Possible causes of failure	terms of settlement
1	Communication 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.
2	Low 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.
3	Communication 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.
4	The 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;
5	The 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.
6	RTU crash	(1) RTU watchdog, imperfect software and hardware design	Field reset
		(2) High electromagnetic interference near RTU
		(3) RTU without good ground wire
7	Output 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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