U.S. Traffic 170E-ATC - Peek Traffic

Chapter 1 — IntroductionGENERALThe US Traffic Corporation Model 170E-ATC Controller conforms to CaltransTransportation Electrical Equipment Specifications dated August 2002.The U.S. Traffic Corporation Model 170E-ATC Controller Unit (hereinafter referred to asthe "Model 170E-ATC") is a solid-state microprocessor-based controller designed foruse in rugged environments such as those found in traffic control applications. TheModel 170E-ATC has plug-in printed circuit cards and uses either a Motorola 68HC11 ora 68B02 microprocessor-based stored program to provide logic control for such trafficapplications as local intersection control; ramp metering; diamond configurations;freeway management; accident incident detection; school zones; changeable-messagesign control and other special functions. Control of the unit is made using a front panelkeyboard and associated display indicators.Important Notes Before Installing the UnitSUPERCAPACITOR CHARGE UPSupercapacitors in the Model 170E-ATC Controller Unit are responsible for providingpower to Power Up/Down circuitry and Real Time Clock Adjust (RTCA) circuitry duringpower down conditions.Following a long period of being powered down (in storage, for example), thesupercapacitors will be fully, or near-fully discharged. It is conservatively estimated thatthese supercapacitors will charge up to one-third full charge after three hours of poweron, and will be fully charged after three days of power on. Accordingly, it isrecommended that the Model 170E-ATC Controller Unit be operated in a power upcondition for at least 3 days prior to field installation.REMOVAL OF MODULESCautionEnsure that the A.C. power switch on the front panel is OFFBEFORE removing or installing any modules or components.4 U.S. Traffic 170E-ATC Controller Operating Manual