GE 750-P5-G5-S5-HI-A20-REH On site interface module
Diagnose faults based on the sequence of actions. Regarding automatic control, the actions of 750-P5-G5-S5-HI-A20-REH are completed in a certain order. After investigating the system’s movement process and comparing the fault with normal conditions, 750-P5-G5-S5-HI-A20-REH can identify suspicious points, and 750-P5-G5-S5-HI-A20-REH can diagnose the fault factor. 750-P5-G5-S5-HI-A20-REH If a certain water pump requires both front and rear valves to be opened, the pump cannot be started if the pipeline is not connected.
Diagnose the fault through the PLC program. The vast majority of faults present in PLC control systems are detected through PLC program checks. 750-P5-G5-S5-HI-A20-REH partial faults can directly display alarm factors on the screen; Although there are alarm messages on the screen, 750-P5-G5-S5-HI-A20-REH, they do not directly reflect the alarm factors; Some faults do not generate alarm messages, and only some actions are not performed.
PLC self fault diagnosis:
Generally speaking, PLCs are extremely reliable equipment with a low failure rate, but external factors can also cause PLC damage.
(1) A nearby switch with a 220V homework power supply shared a 4-core cable with the two input PLC signal contacts and the 220V power line of the nearby switch. The nearby switch was damaged once, and the electrician mistakenly adjusted the zero line of the power supply to the common line of the input PLC during replacement, resulting in the burning of three PLC input points during power transmission.
(2) The zero line of the primary system power transformer was suspended due to corrosion, causing the PLC220V power supply to rise to 380V and burn out the power module at the bottom of the PLC. During the later rectification, a 380/220V isolation control transformer was added.
(3) PLC outputs common terminal labels of 1L, 2L, etc. When the operating computer is ACL1N, it indicates that the+24V power supply is L+M, which indicates a simple mistake for beginners or those with limited experience. If L+M is mistakenly used as a 220V power terminal, it will burn out the PLC24V power supply at the moment of power transmission.
(4) Based on the author’s long-term experience, the probability of hardware damage or software operation errors such as PLC and CPU is simply zero. If the PLC input point is not caused by strong electrical invasion, it will not be damaged. The normally open point of the PLC output relay, if it is not for external load short circuit or unreasonable design, the load current exceeds the additional range, and the contact life is also very long.
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