Powering pixels both directions

uncledan

Full time elf
Generous elf
Joined
Dec 27, 2014
Messages
261
Location
Buellton California
The subject came in chat regarding power injecting pixels in both directions. My whole display is based upon this and I've had no issues other than maybe one blown fuse (it served its purpose). Someone in chat had mentioned that someone told them it wasn't recommended to power the strings in both directions. You should disconnect the V+ between the injection points. In my mind the fuse is to protect the wire and/or a short. If one fuse blows and you're now powering twice the pixels from one injection point... the other fuse will blow as well. Thoughts on the subject?
 

darylc

404 darylc not found
Global moderator
Joined
Dec 8, 2012
Messages
778
yeah ideally you should disconnect the v+ between injection points, otherwise you can end up with cascading fuse failure. In practice you can often get away without doing so though.
 

uncledan

Full time elf
Generous elf
Joined
Dec 27, 2014
Messages
261
Location
Buellton California
yeah ideally you should disconnect the v+ between injection points, otherwise you can end up with cascading fuse failure. In practice you can often get away without doing so though.
No harm in a cascading fuse feature thought right? They still do the job. Just out a few fuses if you have an issue?
 

R Weiland

New elf
Joined
Jun 11, 2017
Messages
3
The subject came in chat regarding power injecting pixels in both directions. My whole display is based upon this and I've had no issues other than maybe one blown fuse (it served its purpose). Someone in chat had mentioned that someone told them it wasn't recommended to power the strings in both directions. You should disconnect the V+ between the injection points. In my mind the fuse is to protect the wire and/or a short. If one fuse blows and you're now powering twice the pixels from one injection point... the other fuse will blow as well. Thoughts on the subject?
Typically we inject to avoid excessive voltage drop in the pixel wiring. If using multiple power supplies then yes you might need to separate the V+ lines. If powering a run of pixels from a single supply then powering the pixels from both ends is the standard practice. See the 101 Lighting manual on power supplies for more info on power injection.
Cheers
 
Top