Dear All,

We have delta V 9.3 DCS for our plant. When we were measuring the Voltages at 24 Vdc Power Supply, 2 of our AO Cards, all Channel stop functioning. All channel LED start blinking. & all control valve on the same card got shut off. The power LED was green glowing normal. Error LED was also Off. Even after replacing the card, problem was as it is. After Restarting the Engine Station Cards Become Normal.

I want to Know The Exact problem. Whether it is due to Static Charges?

 

The symptoms may indicate that the bussed field power was interrupted. In order to obtain the best analysis, you should contact Emerson's Technical Support for DeltaV at:

http://www.emersonprocess.com/systems/support

 

Hi Ghate,

What type of instrument/multimeter did you use to measure the voltage. Did you measure between + and - or + and earth. Also when you changed the card did you download to it?

Brian

 

Dear Brian;

Actually we didn't download the card. we are using Meco multimeters (very simle model) & we were measuring the voltage in +ve & -ve only. Now we faced the same problem few days back & found that the power supply terminal connection were loose.