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FAAC 455D - wiring issues? - Printable Version

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FAAC 455D - wiring issues? - jonah - 19-01-2026

Hello everyone.

I think I have an issue with the wiring of the close sensors on our gates - we have a pair of gates with FAAC arms and a 455D PCB, with optical closing sensors across the gate posts. 

As a result of a long story, I swapped in a brand new 455D board and kept the existing wiring and connectors which I plugged into it, set the same settings as before including setting them to Automatic, and then did the complete Time Learning sequence which worked perfectly (Leaf A open, slow, stop; Leaf B open, slow, stop, close, slow, stop; Leaf A close, slow, stop). I had hoped it would just work...

When removing the original board and unplugging connectors, a couple of the wires from the closing sensor were loosely in connector slots. I assumed they had pulled out so fixed them back in. However I only have the top 2 bars showing - when I press the pedestrian access button the pedestrian leaf opens (light comes on) but it never closes. I understand this implies the closing safety device is active... I changed the Fail Safe option to check, and indeed when I do this the pedestrian leaf doesn't even attempt to open.

I figure either I've messed up the wiring or the sensors are broken - without knowing if I've wired it correctly I can't tell which it is though. I can't understand how this should be wired:

   

So the closing sensor is the grey wire in the bottom right. I have green going to 12, black and white going to 14, and red going to 17. I have an old photo of the board from a year ago but it's unclear on that whether red and black were wired into 14 and 17 or just "near them". I have tried taking red and black out but it hasn't worked and I know I shouldn't be guessing!   Sad

As far as I can tell the other half of the sensor is blue=16 and brown=17 (the cable is underground).

When I read the FAAC manual it doesn't explain anything more than connecting to 12 for closing photocells (I don't understand what the RXCL/TXCL diagrams reference?). I also read it to imply that there should be a wire doing directly from 13 to 19 as there is no opening sensor but there has never been a wire there?


I'm pretty confused, I would really appreciate any help on this please.

Thanks.

RE: FAAC 455D - wiring issues? - jonah - 24-01-2026

Just a bump to see if there's anyone who can help please?

RE: FAAC 455D - wiring issues? - Aiden Mitton - 28-01-2026

(24-01-2026, 10:13 AM)jonah Wrote: Just a bump to see if there's anyone who can help please?

Hi Jonah,

Is it possible you could let me know which photocells you are using? Are they being wired with 2 cores or 4 cores?

Many Thanks,

Aiden.

RE: FAAC 455D - wiring issues? - jonah - 28-01-2026

Hi Aiden

Thanks so much for the reply. The photocells are Roger Technology, I can't see a model number on them but they look like these:

https://www.rogertechnology.it/en/solutions/categorie/accessories-security/accessories-and-security/photocells/series-m90/m90f2eso
https://www.rogertechnology.it/public/userfiles/documents/Documentazione/Manuali%20e%20Istruzioni/Fotocellule/M90%20F2ES%20Istruzioni%20IS70%20Rev02%20A5.pdf

On my photo above, one of the cables from the photocells is the thinner, darker grey one coming up from the bottom right that has 4 cores (green, black, white and red). The other photocell cable comes under the driveway so I'm not 100% sure which one it is as there are 3 cables coming out of the ground that look the same!

Here is a zoomed out photo:

   

So the other photocell cable is most likely either the one below (ie. dark grey 3rd from bottom) with blue=16,brown=17 or the second one down which is blue=9, brown=12?

From my very limited electrical knowledge that manual makes it look like 1 cable is 4 core and the other is 2 core which makes sense?

One other point, I am sure there used to be a visible infra-red type light from at least one of the photocells but I can't see that now - both photocells are 100% secure and sealed onto granite posts so I don't believe they are misaligned if that helps!

Thanks.

RE: FAAC 455D - wiring issues? - jonah - 04-02-2026

Another bump to see if anyone might be able to decode where this wiring is wrong please?

RE: FAAC 455D - wiring issues? - Aiden Mitton - 17-02-2026

Hi Jonah,

Apologies for the delayed response.

Using the photocells in the first link as reference you would wire as per below. I would find out which cables from the photocell is going to the control panel and which colours are which.

+ From Photocell (Terminal 1) -> Terminal 17
- From Photocell (Terminal 2) -> Terminal 16
Normally Closed (N.C) From Photocell (Terminal 3) -> Terminal 12
Common © From Photocell (Terminal 4) -> Terminal 14

I hope this was useful,

Many Thanks

Aiden.

RE: FAAC 455D - wiring issues? - jonah - 20-02-2026

Thanks - I spoke to FAAC and Roger Technology and with their help we deduced it was either the photocells or the cable, so I bit the bullet and cut away the silicone around the photocell to open it up... as I unscrewed the cover it was like a waterfall:

   

So now I will replace those and try again... perhaps the wiring wasn't an issue after all, but I will post back with an update after replacing the photocells!