dglad4 - SA's Traffic Systems - Signal Controllers

< > No need, it's still running as normal.

< > Nameplate and manual control switch.

< > I didn't get to see the crash that caused this, nothing else around was damaged.

< > Wow that chassis is warped.

< > Internal cover laying on the ground outside the door. The warping must have caused this to spring off.

< > Rope used to hold the door shut.

< > I didn't expect such a nice internal lighting system, already on for me and all.

< > Several live mains covers and more were broken off, so the tape is fair enough.

< > Just sitting on the foundation over the pit. It was
very loose and was rocking just by touching it. The car
had ripped out all support that was mounting it to the foundation.

< > Noting the labels at the top of the rack.

< > Full shot of the rack. Centre are the power relays for the signal lights, next to that on the right is the feedback from the inductive detectors. Everything else is self explanatory.

< > Cool to see local LEDs here on the outputs to the signal lights and switches to simulate the inputs or switch them off.

< > All connectored and modular, very nice.

< > Line coming in to feed the processors modem to send and receive information. This is how the emergency services also hold the signals in their favour.

< > Breakout boards for the plugged cables coming from the rack modules. These specific boards are for the inductive detectors which sense waiting traffic.

< > Twin core and shielded cables used, shields terminated to earth ground due to interference concerns.

< > Barely populated module / breakout board.

< > I'm unsure of what these "pedestrian wait" relay outputs do. The circuit board isn't connected to the intersection but the solid state relays on the right are.

< > I'm only guessing but these could be to drive the vibration / sound component on the pedestrian crossing buttons.

< > Addressing card to physically assign a network address for this "site". Interesting zener diodes are cut to set the address.

< > Isolating module for the incoming line. Possibly due to interference, lightning or keeping voltages separate.

< > More detail.

< > Mechanical flasher module for manual control and fail-safe. The logic will shut down if it critically faults (specifically signalling overlapping traffic) causing this unit to engage and take over by flashing all yellow signals.

< > Great to see a detailed list of the components permanently stickered onto the back of the unit door.

< > Just below that is the complete vendors wiring in a nice diagram.

< > Loosely fixed cabling dangling into the pit was likely intentional for this reason, though the unit has moved quite an amount from the foundation, nothing has pulled apart.

< > Pit solution detail.

< > Really? No common bus or linked terminals for these? That's the most wires I've seen jammed into a tunnel type connector.

< > Grid mains input to the 32A fuse under the two breakers, orange is a surge diverter , silver box is a noise filter and same with the parallel grey devices.

< > Close up and earth bus below now shown.

< > Power input control for supply selection and power supply with switch for internal LED work lighting.

< > Auxillary power outlet with inbuilt RCD and auxilliary power inlet with broken off changeover selector switch.

< > Complete view of the terminals to interconnect the internal to the external going out to the intersection.

< > Cables from inductive pickups gripped and held with clearer shot of shields brought to earth bus.

< > Looking inside and up in the main cabinet, the top addon cabinet is empty here on the right side inside. Bug screen is likely there anyway when no top addon is installed, for ventilation.

< > Looking inside and up in the main cabinet now on the left side. I'm unsure of what this unit is for. Best guess would be the no right turn sign programmed for certain times of day to flash.

< > Closer view and focus on the external manual mode changing switch.

< > Vendors test date. It does seem this controller is only a year old, I was reading the log books.

< > Video showing the damage, playing with
the signals and simulating some traffic.

< > Furthermore playing with the signals.
Plenty of fun was had, especially making the street go black.