AC 800 PEC Controller all LED’s suddenly blank
in our system one AC 800 PEC Controller all LED’s suddenly blank .How did it happen?
Primarily check Power supply for AC800PEC at controller back plane terminal X1 and X2.
In AC800PEC there is separate led module powered up by 10 pin connector via back plane. check connections.
What caused led to go blank ? or what happened? what was sequence of event ? is this controller is at some site or at inhouse project area ? more info required.
Could you tell the controller is working but the LEDs turned off?
If yes could check the module power supply connections
Also the connection between the module and the control station
Measure the values of the power not only check the presence!
Is that action happened after an even in the plant?
Is there is any other electronic items effected (even in other control system or indicators)