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Old July 22nd, 2010, 10:50 AM   #31
United States

jtorres2_77 is offline
Join Date: Feb 2006
Location: chicago
Posts: 63
I am also willing to purchase non working Allen bradley processors. Please dont't just throw them away.
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Old April 23rd, 2012, 02:36 PM   #32

ruellaurio is offline
Join Date: Apr 2012
Location: Winnipeg Manitoba, Canada
Posts: 5
Originally Posted by N_ubalde View Post
Ive had the same issue which happens after a power switch-over from the grid to gensets.
I used to work at Toromont CAT Power Systems, This scenario is very typical in your application, my recommendation is, install a line conditioner or switch mode power supply in-line to your PLC rack power supply unit, that is from the genset side --> this is to minimize voltage shoot through in CPU internal logic power supply. Hanggang sa muli. Salamat.
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Old November 1st, 2012, 02:42 PM   #33
Programmer Dave
United States

Programmer Dave is offline
Join Date: Nov 2012
Location: Pittsburgh, PA
Posts: 2
Exclamation Resolving Solid Fault Light...

Ok, after talking to a Rockwell Tech about this problem, he told me the simple 99% fix...
Are you ready for this?
The power supplies ship configured/jumpered for 240VAC (to prevent accidentally killing them by hooking them up to 240V.) But most folks wire them up to 120VAC.
If you check the AC and DC output voltages, they look OK. But the processor knows better.
Moving the power supply jumper to 120V solved my problem.
I don't know why they don't make the power supplies auto-sensing, it's almost a freebie these days...but AB is NEVER about freebies!
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Old March 20th, 2017, 02:37 PM   #34
Russian Federation

Ant123 is offline
Join Date: Mar 2017
Location: RU
Posts: 1
I have the same problem with 1747-L553:

FLT alway solid red, RUN always off. Others (BATT, FORCE, ENET, RS232) keep flashing or off alternatively.

But sometimes(less then 5%) PLC starts normally.

Can anybody tell me what caused this fault?

Is it power supply related problem?

Or maybe there are bad contacts between PCB and BGA chips?
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