Components
4
Traffic Cabinet
Power Supplies
The power supplies provide voltage to power the modules.
Multiple power supplies provide power redundancy. If one
power supply in the group fails, the other supports the full power
load, preventing power failure to the modules.
Isolation Board
One isolation board mounts to each power supply. The isolation
board provides input and output voltage to the power supply.
shows an isolation board. The isolation board receives
120 VAC input voltage from the distribution panel. Output from
the power supply routes through the isolation board. From there,
the 24 VDC output routes to the DC breaker rail.
Isolation board diagnostics include power supply data sent to
the Vanguard
®
Field Controller about output voltage.
Cabinet Light
The traffic cabinet is equipped with a fluorescent light and
sensor. The light is located on the top rack of the traffic cabinet.
The door sensor, located at the bottom of the traffic cabinet
door opening, activates the light when the cabinet door opens.
Door Reporting
The door sensor, located at the bottom of the traffic cabinet door opening, can report
whether the door(s) are open or shut. This information routes to the mini CAN I/O board,
which monitors the status of the door sensor(s) and reports the status to the Vanguard
®
Field Controller.
Pull-Out Drawers and Shelving
Traffic cabinets contain a pull-out drawer and several support shelves. The shelves hold
components such as the Vanguard
®
Field Controller, the communication device, or a
laptop computer.
The pull-out drawer is often used for storage of extra supplies such as screws,
screwdrivers, or other hardware, and for the display and controller manuals. The pull-out
drawer also can be used as a temporary location for a laptop computer.
Panelboard
The panelboard is equipped with breakers that control power to lights, heater, and other
power circuits.
Outlet Strip and Outlets
The GFCI and utility outlet are located next to the panelboard. The outlet strip offers
several outlets for plugging in or charging electrical devices.
The outlet strip offers several outlets for plugging in control equipment.
Exhaust Fan Assembly
The exhaust fan assembly is located at the top of the traffic cabinet and includes the
exhaust fan and a thermostat. The fan and thermostat keep internal components and
the interior of the traffic cabinet cool.
Figure 3:
Isolation Board
