Old Modicon PLC Fault

russrmartin

Member
Join Date
Aug 2002
Location
Eastman, Wisconsin
Posts
744
Need some quick assistance out there. Right at this moment we have an old Modicon PLC. There is a remote I/O rack that is powered by a P810 power supply. There is an overload light on the power supply that is lit and the main processor shows a comm error. Does anyone know what this overload error means. We are going to try swapping out the power supply right now, but I am wondering is there something else we should try or do?

Russ
 
That was it

Well, the power supply was indeed the problem. I do have another question though. After reading the manual for the new power supply, I get the idea that if the power supply is not cause cause of the problem, that one of the I/O racks must have a short of some sorts. Is there any logical way to isolate that card other than to pull them all one at a time?
 
No, unless there are other symptoms. You will have to pull cards and disconnect racks until the problem is located (or remove everything and reinstall them one at a time).

Do you have multiple racks on the supply? Maybe one of the interconnect cables is bad?
 
The ploblem is a fail in the power supply, there are two capacitors together that have a shortcircuit you need to replace the values are 220uf 30v are locate next to sink transistors. good luck.
 

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