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PostPosted: Sat Dec 09, 2017 8:52 pm 

Joined: Wed Jun 22, 2016 7:12 pm
Posts: 10
I have an EST-3 system with 2 panels and 3 ANNCPUs.
Upon arrival main panel says Network Panel 3 Fault

2 annunciators were powered off of the main panel 3-PPS that has 4 SDDC cards. I was informed that the panel had stated that the panel had read Aux Pwr Ovld Ckt before they move the power to the power supply in Panel 2.

Investigation found 24VDC power into ANN (Panel 3) was reversed on the left side. Reversing the wiring did nothing. Moved them to the 24vdc to the right and the unit powered up.

Upon power up, Panel 1 panel displays
Network Panel 2 Fault
Network Panel 3 Fault
Network Panel 4 Fault
Network Panel 5 Fault

Went back and removed Panel 3 from the network. Same panels in trouble.

When power was removed from the other annunciators some of the annunciators would come up while others remained in trouble.

Anyone have any thoughts on this?

To top things off the SDU files are encrypted.


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PostPosted: Sun Dec 10, 2017 11:26 pm 

Joined: Wed Jan 23, 2013 7:30 am
Posts: 64
putting 24v on the 485 terminals cooks the 485 circuits. when powered down, the data passes through ok. you'll need new hardware and programming to fix it.


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PostPosted: Mon Dec 11, 2017 2:07 pm 

Joined: Wed Jun 22, 2016 7:12 pm
Posts: 10
The 24VDC +/- was reversed on the first 24v connection. When I moved it to the other 24v terminal it powered up.


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PostPosted: Tue Dec 12, 2017 10:41 pm 
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Joined: Thu Dec 11, 2008 7:52 am
Posts: 742
what do you mean "SDU files are encrypted"


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