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Battery back-up
Keep signals operating for 2 hours before going to red flash.
Keywords: Traffic_Lights

Battery back-up

Keep signals operating for 2 hours before going to red flash.

CIMG0242.jpg CIMG0178.jpg Michigan_Left.gif CIMG4302.JPG CIMG1235.JPG
File information
Filename:CIMG0178.jpg
Album name:rlshieldjr / Traffic Signals
Keywords:Traffic_Lights
Company and Date Manufactured:Myers
Model Number:PB-2000
Filesize:53 KiB
Date added:Jun 04, 2010
Dimensions:360 x 480 pixels
Displayed:14740 times
URL:http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=2094
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Comment 18 to 37 of 37
Page: 1 - 2

Silverliner14B   [Sep 06, 2010 at 09:53 PM]
I noticed in Florida, in the event of a power outage the traffic signals simply go out. Drivers dont seem to treat them as stop signs so a policeman is required to direct traffic.
GullWhiz   [Sep 07, 2010 at 12:49 AM]
Around here, it varies! If it goes out completely...police gets involved......There may be some systems that have battery packs.....but some don't....
joe_347V   [Sep 08, 2010 at 04:06 AM]
I recall the traffic lights here simply going out when they lose power and drivers are expected to treat them as a 4 way stop but most of the busier streets need police involvement to direct traffic.
rlshieldjr   [Dec 13, 2010 at 07:37 PM]
Many of the batteries are in need of replacement now, they last about 3-5 years. sometimes only one will fail and show a full voltage but dies under load. We found a few intersections in need of batteries during our last inspection.
rjluna2   [Dec 13, 2010 at 07:58 PM]
That is the responsiblity of maintaing UPS box by replacing those batteries. I have 5 UPS is being used at home for each computers at home (2, my father, 1, my mother and 2 for myself). One at work Cool
SeanB~1   [Dec 14, 2010 at 04:31 PM]
UPS maintenance is expensive when you replace batteries that are aging, especially with the UPS at work, that uses a half gross of 7AH SLA cells.

The UPS in my office is older tech, uses 3 car batteries in series, or now 36 of the best of the other ups batteries in a series/parallel stack.
streetlight98   [Aug 02, 2011 at 12:37 AM]
here when the power goes out, the signals go completly out.
joe_347V   [Aug 02, 2011 at 03:39 AM]
There's a few controllers here with a additional box on the cabinet which I'm guessing is a backup battery.
basilicon89   [Aug 02, 2011 at 06:55 AM]
Our newer cabinets have transfer switches mounted to the side of the cabinet
streetlight98   [Sep 26, 2012 at 01:24 AM]
I noticed here when the power goes out the signal goes dark, but some signals will go into flashing mode when the power comes back after it's out for a while while others will resume their normal operation.
basilicon89   [Sep 26, 2012 at 01:49 AM]
depends on how the cabinet is programmed for start up state...usually all-red, or flashing for a minute or so before going into normal operation. Going straight into operation seems like a unique thing. My cabinet is set for 30 seconds of flashing red in all directions before going into normal operation following powerup.
streetlight98   [Sep 26, 2012 at 02:08 AM]
The ones i'm referring to will continue to flash for up to a week if the power outage is long enough. I'm not sure if they eventually go back to normal on their own or if a worker has to reset it or something...
basilicon89   [Sep 26, 2012 at 02:34 AM]
A lengthy flash state is due to a tripped conflict monitor that needs the brownout fault reset by a technician. Newer models of monitors self reset for power outages.
rlshieldjr   [Sep 29, 2012 at 02:08 AM]
They could be on flash because no one reported them. Another problem is that the line to the cabinet suffered severe over voltage such as a lightning strike or a primary (2-16kV) touched the 120v line. Rain water may have shorted across two colors tripping the MMU / CMU, and the intersection was now a large one, and not a priority compared to others.
traffic light1   [Dec 23, 2012 at 02:42 AM]
I like LED traffic lights Cool .
SeanB~1   [Dec 23, 2012 at 05:39 AM]
There are now 2 sets of lights in the city with solar powering, using battery packs and inverters. I do not know how they are wired, but I think they have grid tie inverters driving a standard large ups as they do say they feed power to the grid.

Would be nice if Eishkom allowed grid tie inverters to be connected, it would make life easy to add solar electricity to a house.
rlshieldjr   [Sep 04, 2013 at 06:01 AM]
I replaced a bypass switch in a BBS like this. It is the rotary switch in the upper right. Also some more batteries have failed and will have to be replaced.
rlshieldjr   [Oct 31, 2015 at 07:46 PM]
We had problems now - had several of these vandalized and batteries stolen, we since put on heavier locks.
SeanB~1   [Oct 31, 2015 at 09:09 PM]
Is the lead price up again, that is normally what happens to those cells, sold for scrap value.
dor123   [Mar 26, 2024 at 06:20 PM]
Some junctions here in Israel, have UPSs for the traffic lights, but otherwise, the traffic lights goes out in power outages.

Comment 18 to 37 of 37
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