899The complete dial unit assembly shall be mounted in a manner which allows it to slide

715.42.1 2.4-Electrical Connectors: All electrical connections to and from t he timer

unit to the controller back panel shall be made through a 47 pin MS screw -type connector and wiring harness. Each wiring harness shall be at least forty -eight ( 48) inches long or of the standard length specified by the manufacturer for that contr oller type. The harness shall have color -coded leads of labeled sleeves or labeled wires. The harness connections on the controller shall be such that the timer unit may be replaced with a similar unit, without the necessity of disconnecting and reconnec ting individual wires therefrom. Seven circuits in this connector shall be capable of handling No. 12 AWG wire and a maximum of 30 amperes each. Connector pins for these circuits shall be rated at 41 amperes. All other connector circuits shall be rated at 15 amperes (No. 16 AWG) with connector pins rated at 22 amperes.

715.42.1 2.5-Controller Wiring Panel: A controller panel shall be installed on the

back wall of the controller cabinet on which all relays, contactors, breaker receptacles, electrically operated switching devices and other auxiliary controller equipment, not an 900 integral part of the timer unit assembly, shall be mounted. The panel shall be easily demountable in order that the entire control system can be removed, inspected and replaced as a unit. There shall be a minimum of three (3) inches clearance between the bottom of the panel and the bottom of the cabinet. All terminals, except the interconnect system terminals, shall be mounted on the controller panel. Interconnect terminals sha ll be mounted on the side of the controller cabinet, unless otherwise specified. All panel wiring shall be neat and firm. The back panel shall contain at least the following:

715.42.1 2.6-Flashing Operation: Means shall be provided for the substituting of

flashing vehicular signal indications for the normal specified interval sequence. The flashing operation of the controller shall be as specified on the Plans. Flashing of vehicular and pedestrian signal indications shall be obtained from one or more flashers, each of which is a self -contained device designed to plug into a socket mounted on the back panel of the c abinet. Each controller shall be equipped with additional terminals which are so wired that, by an interchange of jumpers, flashing operation may be arranged to display either flashing yellow or flashing red on each of the vehicular signals. Each control ler shall be provided with a flash control switch for activating the flashing of vehicular signals. The controller shall be constructed so that the flashing operation can be obtained by operating the flash control switch even if the controller unit malfun ctions or is removed from the cabinet. During flashing operation, the controller timer unit shall be de -energized. The substitution of flashing vehicular signal indications for the normal specified interval sequence shall be obtainable by time switch as well as by the flash control switch. The controller shall be so designed that an "open" in power service breaker No. 1 shall automatically switch the signal to flashing operation (see 715.42.1.2.5). 901 715.42.1 .2.7-Manual Operation: All controllers shall be designed capable of manual signal sequencing. When manual operation is specified on the Plans it shall be accomplished with the addition of standard components.

715.42.1 2.8-Pedestrian Actuation: When called for on the Plans, non-concurrent,

exclusive pedestrian actuated phases shall subtract the WALK interval time from the lead phase "green" interval and DON'T WALK time from the following phase "green" intervals. Manual operation of interval timing shall provide the same int erval sequence as when the controller is operating automatically. Manual interval timing shall be obtainable by means of weather -resisting manual push -button mounted on a flexible weather proof extension cord. The transfer of manual to automatic operatio n, or vice versa, shall be accomplished by an automanual switch. It shall not be necessary, when switching from manual to automatic operation, or vice versa, to do so at any certain time or to make any time adjustments.

715.42.1 2.9-Signal Shutdown: Each controller shall be provided with a signal

shutdown switch for turning off the signals at the intersection. This switch shall affect the power to the signals only and no other part of the controller.

715.42.1 2.10 -Warranties and Guarantees: The Contractor or supplier is required to

turn over to the Division any guarantee or warranties which are given by the manufacturer as a normal policy. The Contractor or supplier shall furnish the Division with three cope s of complete drawings, diagrams and manufacturer's instructions for installing and maintaining the equipment and any assistance as required for timing and operation of the equipment. Any component called for by the circuit design which has special unique characteristics which would limit that component to certain manufacturers or suppliers shall be so indicated in the manufacturer's instructions. The Contractor or supplier shall make available to the Division, at no cost, engineering data, diagrams, etc. on any later changes or improvements which would increase the performance of the equipment purchased. The Division reserves the right to withhold any payments which may be due, should it be discovered that the equipment does not meet the Specifications.

715.42.1 3-Pre-Timed Fixed Cycle Traffic Signal Controller (Type FT -3): The

purpose of this section is to set forth specific functional specifications and design requirements for the pre -timed fixed cycle traffic signal controller (local). The general design requirements in 715.42.1.2 shall apply, except when the specific requirements exceed those in that section.

715.42.1 3.1-Interconnection: Type FT -3 controllers shall be furnished capable of

interconnection with a master controller and other local controllers in signal system. A fused, interconnect terminal panel shall be furnished for mounting on the controller cabinet side wall. As a minimum, functional terminals for offset No. 1, offset No. 2, offset No. 3, dial No. 2, dial No. 3 and flashing operation shall be provided.

715.42.1 3.2-Isolation: The FT -3 controller shall also be furnished capable of

operating as an isolated controller, functionally programmed by time clocks, master controller or other command device.

715.42.1 4-Pre-Timed Cy cle Traffic Signal Master Controller (Type FT -3M): The

purpose of this section is to set forth specific functional specifications and design requirements for a pre -timed fixed cycle master traffic signal controller (master). The general design requiremen ts in 715.42.1.2 shall apply, except when the specific requirements herein exceed those in that section.

715.42.1 4.1-System Supervision: Type FT -3M controllers shall be furnished capable

of providing system supervision for local controllers (FT -3) or l ocal coordinating units (LCU), or both. All equipment and apparatus necessary to provide this supervision shall be furnished in the controller. The following supervisory functions shall be furnished in the controller as a minimum:

715.42.2 Solid State Traffic Actuated Signal Controllers:

715.42.2 1-Definition of Terms:

Actuated: Identifies the type of signal control which responds to calling signals generated by action of vehicle or pedestrian. Actuation: The operation of any type of detector. Auxiliary Equipment: Separate devices used to add supplementary features to a controller assembly. Cabinet: An outdoor enclosure for housing the controller unit and associated equipment. Call: (Vehicle or Pedestrian) The result of a detector actuation indicating the presence of a vehicle or pedestrian requesting right -of-way. 903 Chass is: The traffic signal controller and housing, complete with power supply, internal wiring, harness pin connector and module bays to accommodate the number and type of phase modules specified. Check: An outgoing circuit that indicates the existence of unanswered call. Clearance Interval: A specific interval of time which follows after the termination of right -of-way to vehicles or pedestrians. Controller: A complete electrical mechanism, includin g timer for controlling the operation of traffic signals. Coordination: The terms applied to the interrelation between two or more intersection controllers. Cycle: The total time required to complete one sequence of signal operation around an intersect ion. Detector: An electrical device which when actuated signifies the passing or presence of a vehicle or pedestrian desiring the right -of-way. Digital Timing: Pertaining to a method of timing that operates by counting discrete units. Dual Max: A con troller feature which provides two possible maximum time settings for cycle or right -of-way interval total time before termination. Extension Limit: The maximum time of the extensible portion for which actuations on any traffic phase may retain the right -of-way after actuation on an opposing traffic phase. Extension Unit: The timing interval during the extensible portion which is resettable by each detector actuation. The green right -of-way of the phase may terminate on expiration of the unit extension time. Fail Safe: A controller feature that prevents conflicting phase indications when power or equipment malfunctions occur. Flasher: A complete electrical mechanism for flashing a traffic signal or beacon. Force Off: A command that will force the termination of the right -of-way. Full Actuated: An intersection signal controller with detector input capability in all phases. Gap Reduction: A feature where the "unit extension" or allowed time spacing between successive vehicle actuations on the pha se displaying the green in the extensible portion of the interval is reduced. Hold: A command that retains the existing right -of-way. Initial: (Green) Minimum or guaranteed green time allotted the timing phase before which termination can begin. Inter face: A relay or electronic device(s) which isolates and matches one portion of a system to another. Interval: Any one of the several divisions of the time cycle during which signal indications do not change. Interval Sequence: The order of appearance of signal indications during successive intervals of a time cycle. Main Frame: A definitive single chassis unit within the controller cabinet that contains all signal timing and control logic. This does not include back panels, load switching devices, flashers, breakers, detectors and other peripheral equipment inside the controller cabinet. Major Street: The roadway approach or approaches at an intersection normally carrying the major volume of vehicular traffic. 904 Manual Cont rol: A control to permit authorized personnel in the option of terminating an active phase and initiating the next sequence in the signalization cycle. Maximum: A time limit applied to traffic actuated controls to terminate and recall the timing phase a fter a predetermined time. Memory: Holds as recall a momentary vehicle actuation in the phase timer until the proper signal sequence can be displayed to release the vehicle. Minor Street: The roadway approach or approaches at an intersection normally carrying the minor volume of vehicular traffic. Modular Design: A design concept such that functions are sectioned into plug -ins units which can be readily exchanged with similar units. Monitor, Signal Conflict: A device used to continually check for th e presence of conflicting signal indications and too provide an output in response to conflict. Nonlocking Memory: A mode of actuated -controller -unit operation which does not require detector memory. Overlap: A right -of-way indication that allows traff ic movement when the right -of- way is being assigned to two or more traffic phases. Panel: A panel within the controller cabinet upon which are mounted fuse receptacles, terminals, relays and electrically operated switches and other equipment, all suitabl y insulated. Passage Period: The time allowed for a vehicle to travel at a selected speed from the detector to the nearest point of conflicting traffic. Pedestrian -Actuated Controller: An automatic controller in which part of the intervals or groups of intervals, particularly pedestrian WALK and clearance intervals, are initiated by the actuation of a pedestrian detector. Pedestrian Detector: A detector, usually of the push -button type installed near the roadway and capable of being operated by hand. Pedestrian Phase: (Pedestrian Movement) A traffic phase allocated exclusively to pedestrian traffic. Power Line Switch: A manual switch for discontinuing the operation of both traffic controller and traffic control signals. Power Supply: As used, a f used regulated DC power source for operation of control equipment where necessary. It must be an integral part of the controller chassis. Pre-emption: The transfer of the control of the signals from any phase or controller mode to a pre -emption timing u nit to provide right -of-way for emergency vehicles or trains. Presence: Term applied to the detection pulse produced by a passing vehicle to be used by the control for other than count purposes. True presence indicates that the pulse duration is equal to the actual time the vehicle remains in the detector field of influence . Radio Interference Suppressor: A device inserted in the power line in the controller assembly (cabinet) that minimizes the radio interference transmitted back into the power supply line, which interference may be generated by the controller or other me chanisms in the cabinet. Recall: A manual switch which will cause the automatic return of the right -of-way to a street, regardless of the absence of actuation on that street. Rest: The interval portion of a phase when present timing requirements have been completed. Semi -Actuated: A type of traffic actuated controller in which means are provided for traffic actuation on one or more, but not all, approaches to the intersection. 905 Sequence: The order in which signal intervals are displayed around an intersection when there are calls on all phases of an intersection. Signal Indication: The illumination of a traffic signal lens or equivalent device, or of a combination of several len ses or equivalent devices, at the same time. Skip Phase: A feature of actuated intersection control which omits the right -of-way signal indication for a phase or movement that does not have vehicle or pedestrian calls. Solid State: Circuitry using semi -conductor devices exclusively in contrast to electronic (electron tubes) and electro/mechanical devices (relays, motors, etc.). Split: The division of time within the signal cycle between adjacent phases in the sequence. Stop Timing: Refers to the fea ture of a signal controller by which the application of an external signal or voltage will stop any one or all interval timers from timing further. Terminate: Applies most frequently to the end of a timing interval. Termination of right -of-way begins in an active phase when a call is received from an inactive phase in a full-actuated control; right -of-way termination must always include adequate clearance intervals. Time Cycle: The number of seconds required for one complete revolution of the timing di al or complete sequence of signal indications. Traffic Adjusted: Term used in master supervisory systems where vehicle actuations and other data are fed to the master for effecting signalization changes at several intersections rather than at each inters ection independently. Uniform Manual: (MANUAL OR MUTCD) Manual on Uniform Traffic Control Devices for Streets and Highways, published by the Department of Transportation, Federal Highway Administration. Vehicle: A mobile inanimate object which legally must use roadways and is subject to traffic control by signalization. Volume: Numerical count of vehicle traversing a roadway and passing over a detector in the roadway. Wiring Harness: The multi -terminal (M or F) connector and associated wiring throug h which all electrical connections into and out of the controller chassis are made. All wiring harnesses shall be at least forty -eight ( 48)_ inch long. Yield: A command which permits the transfer of the right -of-way. The above list of definitions may not be complete for all terms used. Final interpretation of all terms is the responsibility of the Engineer (See Sections 101 of the Specifications ). Where applicable and as approved by the Engineer, definitions as published by the National Electrical Ma nufacturer's Association, Traffic Control Systems Standards may be applicable.

715.42.2 2-General Design Requirements: The following are minimum design and

operating requirements for all types of solid state traffic -actuated signal controllers and assoc iated equipment described in these Specifications. These controllers shall be phase -modular and completely programmed for the phase and interval sequence specified for that chassis type. Phase, interval sequence and phase sequence functions and associate d circuitry shall be assembled on removal plug -in modules. A separate, independent phase module shall be provided for each phase. Controller timing shall be by digital timing, utilizing power line frequency as a base, and be constant and accurate. The l ength of any interval, portion, period or unit extension as 906 determined by the interval timing setting or any other programmed controller function shall not change due to power supply voltage variations between the limits of 95 to 135 volts AC. The nominal voltage shall be 120 volts AC. The controller and all associated equipment shall be designed to operate from a 120 volt, 60 Hz, AC supply (plus or minus 3.0 Hz). Specifically, the environmental and operating limits specified in the latest Traffic Contro l Systems Standards Publication by the National Electrical Manufacturer's Association, designated as NEMA, must be adhered to. A regulated fused power supply shall be an integral part of the controller chassis and it shall provide the DC voltages required for the operation of all equipment when necessary. This power supply shall provide the internal and external voltages and power requirements for normal operation of the signal equipment. A dust resistant metal enclosure, or main frame chassis, suitable protected against corrosion shall be provided to enclose all electrical parts of the controller. The control devices, indicator lights, fuse holders, switches, input/output connectors and other components required for the operation and adjustment of the c ontroller shall be mounted on the front panel(s). All component parts and terminals shall be readily accessible when the controller modules are removed from the enclosure for adjustments, testing or service. Circuit board extender cards or cable may be e mployed to facilitate testing. The controller shall be designed for placement on a shelf. Maximum main frame sizes shall be as designated by NEMA for each controller chassis type. The front panel(s) of the controller shall be permanently marked to indicate the module positions, and to identify the fuses, indicator lamps, switches, controls, etc. so that the operation of the controller shall be readily apparent. The main frame chassis shall be completely equipped and wired for a full complement of m odules as required for that chassis type. No additional hardware or wiring shall be required whether or not the main frame is used with the maximum possible number of modules. All modules shall be removable from the front of the controller and those of u nlike function shall be mechanically keyed or electrically inter -locked to prevent insertion into the wrong opening causing controller unit malfunction. Modules of the same type shall be interchangeable between chassis. All modules shall be provide with controls as necessary to meet the functional requirements. In addition, all control logic for interval and startup sequence, overlap functions, coordination and all other specified controller functions must be an integral part of the main frame chassis. Each module and associated controller bay shall be identified as to phase or function. To facilitate interchangeability, a guide or track shall be provided for each module assembly in the controller chassis. All modules shall be mechanically secured in t he controller so as to retain the assemblies in their proper position under conditions of shock and vibration. Each grouping of controller components as printed circuit assembly shall have a mean time to failure of three years. Printed circuits shall be of epoxy glass with an extra heavy (two ounces or more) copper track or a superior alternate or as otherwise specified by NEMA standards. Circuit reference symbols for all component parts shall be clearly marked on the circuit boards. All switching funct ions internal to the controller shall be accomplished through the use of solid state circuitry. No electrical -mechanical devices, such as camshafts, rotary, stepping or line switches shall be used for switching functions. 907 All controllers shall be equippe d so that they may be coordinated with other controllers or supervised by a master system. This shall be possible by the simple addition of accessory equipment external to the controller.

715.42.2 2.1-Phase Sequence Unit: The phase sequence unit must b e an integral part

of the controller main frame and shall establish the order and operation of the Phase Timing in accordance with vehicle and pedestrian detector calls. In the absence of recall or detector actuation, the right -of-way shall remain on the traffic phase upon which the last actuation occurred. The actuation of any detector during the extendible portion of a traffic phase having the right -of-way shall cause the retention of right -of-way by that traffic phase for one unit extension from the ti me of actuation. One unit extension interval of time shall be guaranteed for each vehicle actuation registered during the extendible period. Each actuation shall cancel the remainder of the previous unit extension interval in effect and initiate a comple te new unit extension interval, timed from the instant of actuation. The actuation of a detector on another phase shall cause the right -of-way to transfer to that phase if during the extendible portion of the timing phase there have been no actuations for more than one full unit extension interval of time. An actuation during the clearance period for a traffic phase shall cause the right -of-way to return to that phase in the same manner. Also, when the right -of-way is transferred by operation of the exte nsion limit, the terminated phase shall again receive the right -of-way in the above manner without further detector actuations. The controller shall be equipped with provision for skipping any phase when there is no call for that particular phase. Exact phase sequence when there are calls on three or more traffic phases shall be as specified for each controller chassis type. The term "Phase A" as used shall in all cases refer to the artery or mainline phase. It shall be the first phase in the sequence of phases. Other phases such as B, C etc. shall follow Phase A in alphabetical sequence with right -of-way assigned in accordance with the above, or specified sequence logic.

715.42.2 2.2-Interval Sequence Unit: The interval sequence unit must be an int egral

part of the main frame and shall determine the order and control of the various intervals of each phase. The rotation shall be Green, Yellow, All Red and Red for vehicle movements and Steady Walk, Flashing Don't Walk and Steady Don't Walk for pedest rian movements. The transfer of the right -of-way from any traffic movement shall take place only after a proper clearance period. The clearance period for each vehicular phase shall consist of a vehicle change (Yellow) and an All Red Clearance interval. Each shall be timed separately and the second clearance interval of any phase may be omitted by a simple timing adjustment. The clearance period for a pedestrian movement shall be a Flashing Don't Walk.

715.42.2 2.3-Interval Settings and Adjustments: The controller shall provide a

positive means of setting signal timing intervals. The settings for each interval shall be in seconds or divisions of a second and the controller shall provide a clear visual display of the length of each interval or period. The interval settings shall be color coded, easily identifiable and shall be made by means of dials or thumbwheels. Settings shall be provided for each phase interval and shall be mounted on the front of the associated main frame phase module. It shall not be necessary to use punched data cards, remove or change