TRAFFIC SIGNAL CONTROLLER ASSEMBLY 825.02
813.03 Equipment — Vac Ant
813.04 Construction Methods
Work with the manufacturer’s representative to ensure correct installation of the lowering device. Obtain a written installation and operation manual from the manufacturer of the lowering device. Obtain at least 5 copies p er project or one copy per device, whichever is greater. After installing the lowering device on the tower, but before erecting the tower, request that the Department’s Traffic Engineer inspect the fully rigged device. Erect the tower after the Traffic En gineer's inspection and the Resident Engineer’s approval.
813.05 Method of Measuremen T — Vacant
813.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: HIGH MAST LOWERING DEVICE Each Include the cost of attachments, wiring, circuit breakers, and other accessories in the contract unit price for High Mast Lowering Device .
825.01 Description
This work consists of providing and installing a full -actuated traffic controller assembly including cabinet, solid -state full -actuated controller unit, load switches, flasher, conflict monitor, and related documentation.
825.02 Materials
Provide a controller assembly in accordance with NEMA Standards Publication TS -1, Traffic Control System (NEMA TS-1). If shown on the Plans, provide a controller assembly in accordance with NEM A Standards Publication TS 2, Traffic Controller Assemblies with NTCIP Requirements (NEMA TS-2).
A.Full-Actuated Traffic Signal Controller
1.Hardware Design Requirements Ensure each controller unit has a permanent label on the unit face displaying a uni que serial number. Provide solid -state, digitally -timed controller units. Synchronize the controller timing
825.02 Traffic Signal Controller Assembly
with the 60 HZ power source. Provide controllers with at least the dimensions and characteristics specified in Table 825:1: Table 825:1 Controller Dimensions and Characteristics Phases 2 Phase 4 Phase 8 Phase Load Switch Positions 4 8 16 Cabinet Size 41 in × 24 in × 16 in 49 in × 29 in × 17 in 55 in × 38 in × 26 in (height × width × depth) [1.04 m × 0.6 m × 0.41 m] [1.24 m × 0.73 m × 0.43 m] [1.39 m × 0.96 m × 0.66 m] Number of Detector Channels 4 10 16 Number of Pre-emption Channels 2 4 4 Number of NEMA Plus Monitor Channels 3 6 12 Ensure the unit face displays the following: Phases in service (one per ring), Phases to be serviced next (one per ring), Presence of vehicle call (one per phase), Presence of pedestrian call (one per phase), Reason for green termination (one per ring), Gap-out, Maximum time -out, Force -off, Pedestrian service (one per phase), and Max II in effect (one per ring). The Department will allow steady and flashing indications for phase in service, phase next, and pedestrian service, or other mutually exclusive indications. Provide a controller that stores and maintains user -programmed entries and timing settings using non -volatile memory. The Department will not allow battery power for memory storage. Provide circuit components capable of withstanding the environments and voltage conditions described in Part 2 of NEMA TS-1. TRAFFIC SIGNAL CONTROLLER ASSEMBLY 825.02 Design the controller unit to operate with the logic ground isolated from the alternating current (AC) neutral (common). Provide a controller unit with the following on the front panel: A high -quality keyboard for entering timings and settings (with a lifetime rating of one million operations per key); and A direct reading alphanumeric or graphic liquid crystal display (LCD) with back lighting. Provide an LCD display with the following properties: Readable from a distance of 3 ft [1 m], at a 45° angle, in any light conditions; An aut omatic time -out feature, unless the display's continuous life expectancy is 10 years or more; An operating temperature range from −30 °F to 160 °F [−34 °C to 71 °C]; Blank out 10 min after the last keystroke; and A display capacity of at least 40 character × 4 lines. If the Contract requires an LCD contrast adjustment control for visibility at temperature extremes, ensure the contrast control is accessible from the controller unit face and does not require tools to adjust. Provide one spare set of proprieta ry components for every ten controller units provided (or portions thereof); at least one set per project.
2.External Download/Upload Interface Provide a controller unit with an RS 232 serial port accessible through a DB25S or DB95 connector. Provide th e following reserve connector pin assignments: Table 825:2 Connector Pin Designations Pin Designation 1 Frame ground 2 Transmit data 3 Receive data 4 Request to send 5 Clear to send 6 Data set ready 7 Signal ground 8 Data carrier detect 20 Data terminal ready 22 Ring indicator Ensure the port has a baud rate of at least 2,400 baud and is selectable by keyboard or jumper. Configure the port for an 8 bit word, 1 stop bit, no parity.
825.02 Traffic Signal Controller Assembly
3.Program Requirements
a.Programming/Data Entry Ensure the controller is programmable (including Time Base Coordinator/ TBC/CBT features) using simple keystrokes aided by full menu displays. The Department will not allow programs and displays that are difficult to program or interpret. Provide controller units us ing a programming interface with the following characteristics: A menu structure containing a main menu with options for each controller sections on one screen; Each option selectable using a numeric entry; Each subsequent menu displays a detailed breakdown of the previous menu option; Each menu option programmed with a descriptive name (e.g. controller section); Entries display and enter in English; Toggle entries are set using “yes/no” or “on/off” responses; Non -alphanumeric symbols with clear mea nings; Numeric entries programmed in base 10; Each NEMA timing interval is programmable for eight phases and appears in a spreadsheet on the same display screen; A copy feature allowing the user to copy all intervals of one programmed phase to selected un -programmed phases (the Department will allow other versions of the copying functions that meet the functional intent, as reviewed by the Department's Traffic Engineering Division and approved by the Resident Engineer); A display scroll feature to show addi tional information; Secure access to unit timing and configuration programmable with at least a four -digit user -selected code (preset to all zeros); and Display features available without requiring access to the unit. The Department will allow internal dip switches to establish codes. Provide a keyboard -entered coded command (series of commands or entries, not a single command or entry) that will set controller and TBC timings and entries to a default or inactive value. Do not place instructions for the a ccess code on the face of the unit. Ensure the coded command allows entry of new values without deleting previous entries.
b.Operational Features Provide volume density timing in accordance with NEMA TS-1. Ensure the controller unit allows dual -entry o perations. Ensure the following modes are available on a per phase basis: Maximum recall, Minimum recall, Pedestrian recall, Soft recall, Detector locking and non -locking memory, and TRAFFI C SIGNAL CONTROLLER ASSEMBLY 825.02 Phase omit. Provide a controller unit with the following selectable progr ammed configurations: 8 Phase NEMA, and 8 Phase Sequential. Design the controller unit to provide pedestrian phasing with any phase. Ensure the controller programs for left turn conditional servicing in the 8 phase NEMA configuration under the following co nditions: The opposing through movement gapped -out; The compatible through movement green continues to extend; or The compatible through movement has enough time to service the minimum turn time and the through movement terminating amber and red; if a left turn is re -serviced, ensure the controller ends the phases when the through phase gap or maximum termination point is reached. Provide a user -programmed controller with detector assignments. Ensure each detector can call or extend the phases. Provide de fault detector assignments in accordance with NEMA TS-1.
c.TBC/BCT Ensure the TBC/BCT selects and coordinates the reversible left -turn sequence operations (dual leading, leading and lagging, or lagging and leading left turns). Ensure operations are tran sferable from one sequence to another at a preprogrammed time. Ensure transfer occurs at the barrier following phases 1, 2, 5, and 6 or at T(0) as defined in accordance with Subsection 825.02.A(3)(d), “Coordinato r Operation.” In addition to operation modes required by the Contract, provide a pedestrian override mode that operates in accordance with the following: No pedestrian calls present – ensure normal phase timings programmed for a particular coordination pla n are effective for service of the intersection. Pedestrian calls present – ensure the programmed pedestrian times service the call and override the normal split times. If the intersection drops out of coordination, ensure the controller returns to coordi nation after servicing the call without altering the programmed phase sequence. Computer controlling the intersection – ensure the computer ignores the pedestrian override mode. User -programmable timing entries on a per phase basis. The Department does no t require special pedestrian override timings and will allow normal pedestrian timing entries for the pedestrian override timings. Individual plan selection of the pedestrian override mode.
825.02 Traffic Signal Controller Assembly
Provide at least 36 patterns specifying cycle length, splits, an d offsets, including the following: At least four cycle length selections, each from 30 s to 200 s, adjustable in one second increments; At least three splits per cycle length selection; and A unique offset for every cycle per split combination, up to 200 s, adjustable in one second increments. Ensure additional patterns available using additional cycle lengths, splits per cycle length selection, or offsets per cycle split combination.
d.Coordinator Operation Ensure the coordinator references a system -wide cycle timer (system cycle timer). T(0) refers to the point in the local cycle timer when the coordinated phase or the leading coordinated phase (if the user selects a pair of coordinated phases) is scheduled for the first time. For early return, T(0) m ay not be the start of green. If early return to main street green occurs, ensure the pedestrian outputs do not turn on until after any other phases are allowed to be serviced before T(0). The offset is the amount of time the local cycle timer is behind the system cycle timer. Ensure the following minimum information is available to the user for establishing patterns: Basic NEMA controller timing, Cycle length (in seconds), Phase sequence desired for the particular pattern, Seconds or percentage of the cy cle that a phase is active, including green, amber, and red times, when there is a constant demand on all input detectors, The offset (in seconds) of the first coordinated phase serviced in the sequence from the referenced clock T(0), and Pedestrian overri de mode selection. Ensure the coordinator performs the following functions for each pattern, using the above list of information: Guarantees the coordinated phase(s) programmed time will be serviced in its entirety to coordinate between intersections; the programmed time of the first coordinated phase in the sequence starts at T(0). Calculates the force -off point of each phase (the point when green must stop to not violate subsequent phase's programmed time, if calls exist). Calculates the start of the perm issive window of each phase (the point in the cycle when the previous phase yields to the current phase). Calculates the end of the vehicle permissive window of each phase (the point preceding the force off point by the minimum time and the clearance time of the previous phase). The Department requires that vehicle calls, received before the end of vehicle permissive window, be serviced during the current cycle. TRAFFIC SIGNAL CONTROLLER ASSEMBLY 825.02 Calculates the end of the pedestrian permissive window of each phase (the point preceding the f orce off point by the pedestrian walk and clearance times and the clearance time of the previous phase). The Department requires that pedestrian calls, received before the end of pedestrian permissive window, be serviced during the current cycle. Guarante es the programmed time of each phase is serviced, if the call occurs before the beginning of the permissive window and the phase does not end due to gap out. The Department will allow percentage inputs for coordination phase times only. Ensure the control ler unit tests the plan after entering the information for phase service to verify no plan errors exist (minimum times are violated). If a plan error exists, ensure the controller displays a code indicating the error. If the error remains uncorrected and the erroneous plan is selected, ensure the controller runs in the free operation mode. If pedestrian override is selected, ensure the coordinator ignores errors detected due to pedestrian times violating split times. Ensure the TBC/BCT is programmable to seek offsets by shortway (lengthening or shortening the cycle by up to 20 percent), and dwell in the coordination phase. Ensure the user can program the longest permissible dwell times. Ensure the TBC/BCT allows the following features and operations unde r time -of-day (TOD) control: Max II Timing, Gap/Ext II Timing, Phase Omit, Free Operation, and Flash Operation. Ensure the user can make the transfer into and out of flash in a safe manner from any point in the phasing sequence, and can program each phase and overlap to flash yellow or red on the controller front panel. Ensure the flashing operation is programmed to simultaneously flash the load -switch driver outputs. Where vehicle detection does not exist, ensure the controller unit coordination program i s programmable from the front panel to emulate a pre -timed controller by recall or BCT where vehicle detection does not exist. When servicing the “walk” violates other phases' permissive windows, unless the call to non-actuated function is active, ensure p edestrian movements for the main street rest in green and “don’t walk .” Ensure the internal reference synchronous pulse (from which the local offset is calculated) resynchronizes at midnight, or ensure the resynchronization is user programmable with the default set to midnight. Ensure a pulse generates when the TOD clock shows a time that is a multiple of the current cycle length after resynchronization. In case of a power failure, ensure the resynchronization is calculated from the programmed resynchroni zation time. Ensure the power failure recovery routine accommodates a power failure at midnight. When the TBC operates in the free mode, ensure the current cycle length will generate a synchronous pulse
825.02 Traffic Signal Controller Assembly
output. Ensure this output does not stop due to co mmands other than external start (in which case all coordination outputs are false). Ensure the coordinated phase or phase pair is selectable from the individual phases or phase pairs in Table 825:3 for each configuration: Table 825:3 Configuration of Coordination Phasing Coordinated Phases 8 Phase NEMA Quad Sequential 8 Phase Sequential Individual 2,4,6,8 2,4,6,8 2,4,6,8 Pairs 2 and 6, 4 and 8 2 and 6 — Note: Do not force compatible pairs to begin simultaneously. When establishing its offset from the reference point, ensure the coordinator references the synchronous pulse leading edge, regardless of width. Ensure the pulse width is at least 1 s. Ensure internal coordination and upload/download programs are simultaneously operable and mutually non -interfering. Program the implementation of revised timing parameters loaded into the timer to occur at controller coordination cycle points that do not alter the selected phase sequence. Ensure the controller continues to operate even if it temporarily drops out of synchronization during the upload/download. Submit to the Resident Engineer a complete description of the upload/download format and protocol with the controller unit to be provided to the maintaining organization.
e.Communication Ensure the internal settings are accessible through the RS 232 interface using an external modem. Ensure all functions, including the following, show in real -time on an intersection graphical display on the modem -connected download/upload unit, or other compatible unit: Detector actuation, Signal indications, Gap-out, Max -out, Minimum green, Extensions, Preempt, and Coordination synchronization status. Ensure alarms are accessible through the RS 232 port by remote interrogation and by automatic dialing initiated by the controller unit. Provide software necessary to perform all functions as part of the controller software on CD-ROM. Provide a set of software for every ten controller units. The Department reserves the right to make additional copies of this software. TRAFFIC SIGNAL CONTROLLER ASSEMBLY 825.02
4.Clock/Calendar Programming Requirements Provide a clock/calendar program with the following characteristics: Capable of easily setting to the time (hour -minute -second), and the date (year -month - day), including the day of the week; Stores a yearly pr ogram including dates and times for starting and ending daylight savings time (DST); User -programmable dates for DST, fixed and floating holidays, and special events using the keyboard; Automatic adjustments for the leap year calendar; and Stores operation sequences in the form of the following programs: 1 yearly, 10 weekly, 15 daily, and 30 exceptions. Ensure the structure and interrelationships of each type of program are in accordance with Table 825:4: Table 825:4 Clock/Calendar Programming Program Entries Daily ≥10 events per daily program, including the following: Time of Day Cycle (1 – 4) Offset (1 – 3) Split (1 – 3) MUTCD Flash (on/off) Mode of Operation Special Function 1 (on/off) Special Function 2 (on/off) Left Turn Sequence (lead -lead/lead -lag/lag -lead) Max II Gap Ext II Weekly 10 weekly programs, including the following: Sunday: Daily Program 1 – 15 Monday: Daily Program 1 – 15 Tuesday: Daily Program 1 – 15 Wednesday: Daily Program 1 – 15 Thursday: Daily Program 1 – 15
825.02 Traffic Signal Controller Assembly
Table 825:4 Clock/Calendar Programming Program Entries Friday: Daily Program 1 – 15 Saturday: Daily Program 1 – 15 Monday through Friday: Daily Program 1 – 15 All Week Days: Daily Program 1 – 15 Yearly ≤52 entries, including the following: Starting Month (1 – 12) Starting Day of Month (1 – 31) Weekly Program Number (1 – 10) Exception Including the first 10 as follows: New Years Day Labor Day Martin Luther King Day Columbus Day Presidents Day Veterans Day Memorial Day Thanksgiving Day Independence Day Christmas Day Ensure 30 exception programs are user programmable for fixed and floating exceptions. The Department considers the fixed and floating exception format a day program (as defined in Table 825:4) with an assigned date (fixed – month/day of mon th; floating – month/week of month/day of week) to override the normally operating program. Provide a copy feature allowing the transfer of entries between programs within the same program level (daily to daily program, weekly to weekly program, etc.). Th e Department will allow other programming schemes as reviewed by the Department's Traffic Engineering Division and approved by the Resident Engineer.
5.Coordination Control Hierarchy Ensure the internal TBC controls the coordinated, free, and flash opera tion of the intersection when 120 V (AC) conventional interconnect line inputs or interconnect free input are absent, and the central computer does not have on -line control. Ensure the master controller TBC controls the controller unit when the interconnec t free input signal is present and the computer is n ot controlling the intersection . TRAF FIC SIGNAL CONTROLLER ASSEMBLY 825.02 Ensure the central computer supersedes the internal time base or external conventional interconnect inputs when the central computer brings the intersection on -line using the on -line input. For non -computerized applications with conventional 120 V (AC) interconnect lines, ensure the TBC and cabinet interface are operable as a master for the conventional wire system and as a local accepting conventional cycle, offset, split , free/flash, and on -line commands from the interconnect line.
6.Preemption Programming Requirements Provide an internal preemptor that is user programmable from the front panel for railroad or fire run preemption sequences. Ensure phases are selectable so a limited signal sequence is operational during preempt (PE). Ensure the user can add phases, not in the intersection sequence, to the special limited sequence without requiring additional external logic. Provide at least the following intervals per Ta ble 825:5: Table 825:5 Controller Intervals – Durations and Increments Interval a Duration, s Increment, s
0.Preempt Delay (Emergency Vehicle Preempt) 0 – 99 1
1.P.E. Minimum Green 0 – 9 1
2.P.E. Yellow 3 – 9.9 0.1
3.P.E. Red Clearance 0 – 9.9 0.1
4.Track Green 0 – 99 1
5.Track Yellow 0 – 9.9 0.1
6.Track Red 0 – 9.9 0.1
7.Minimum P.E. Duration (Flash or Limited Cycle) 0 – 99 1
8.Return Yellow (Solid Display) (Yellow limited after limited cycle green) 0 – 9.9 0.1
9.Return Red Clearance (Red after Flash P.E.) 0 – 9.9 0.1 a Terminology may vary but the meaning must be clear. Ensure the user can program additional, unspecified intervals to zero. If using three letter abbreviations or interval numbers on the display, define them on the front panel. While in preemption, ensure the display identifies the timed intervals as preempt intervals. The Department will allow the use of yellow and red clearance from the phase timings in place of the specified clearance intervals, as long as all other preemption requirements are met. Ensure the phases serviced after the preempt sequence are programmable using the front panel keyboard.
825.02 Traffic Signal Controller Assembly
Ensure the preempt sequences are selectable using external inputs. Assign preempt priority with No. 1 as t he highest. If the controller receives a higher priority PE input during a sequence, ensure the controller unit immediately clears to the next all -red interval before entering the new sequence. Reserve preempt 1 for a priority railroad preempt. If more t han two preempts exist, ensure the user can delete the priority overrides except the railroad preempt. If a non -priority preempt activates during another preempt cycle, ensure the in -progress preempt completes its cycle. If the second preempt input is ac tive when the first finishes, ensure the controller unit goes to all -red flash or the programmed point in the non -priority preempt. When preempt inputs are removed, ensure the controller unit proceeds through the normal sequence to return red clearance (I nterval 9). Once the controller unit enters the PE minimum green following preempt delay (Interval 1), ensure the sequence continues to completion, even if the call is dropped. If the call returns or remains through the minimum preempt (Interval 7), ensur e the controller unit remains in the minimum preempt until the call is dropped. Ensure the controller unit is programmable to be in flash or limited sequence during Interval 7. If flash is programmed, ensure the phases flash yellow or red, as programmed form the front panel. Implement flash by simultaneously flashing the appropriate load -switch driver outputs, not by setting the voltage monitor output to false. When selecting limited sequence, ensure all phases are programmable even if not normally used in the intersection sequence. If a power interruption as defined in NEMA TS-1, and the preempt command is present when power returns, ensure the controller unit powers up in all -red flash operation and remains there until the preempt command is removed. Ensure overlap phases start and end with the parent phases in accordance with NEMA TS-1. If the preempt occurs during yellow or red displays between parent phases, ensure the overlap phase displays yellow for at least 3 s and red clearance for at least 1 s. Ensure “Don’t Walk” displays throughout the preempt sequence unless a limited cycle runs during the preempt duration (Intervals 2 through 9). During a limited cycle (Interval 7), the Department will allow pedestrian heads programmed to dark. Ensure pree mpt routines have priority over all functions, except emergency and conflict flash. Ensure the signal from the conflict monitor stop times the preempt cycle until removed or reset. All intervals are sequential. The Department defines the logic of each inte rval as follows:
a.Preempt Delay Ensure preempt delay starts immediately upon receipt of the preempt command. Ensure the preempt delay does not affect the normal operation of the controller until the delay time out occurs. Use this interval for emergen cy vehicle preemption delay. Ensure the interval is omitted if zero time is set. TRAFFIC SIGNAL CONTROLLER ASSEMBLY 825.02
b.PE Minimum Green When the PE minimum green interval becomes active, ensure any vehicle signals displaying green does not end until the programmed time lapses. Ensure “Wa lk/Walk” indications change to “Don’t Walk” immediately at the interval end. Ensure the interval is omitted if zero time is set.
c.PE Yellow Clearance Ensure green signals not programmed as track or fire lane signals, change from green to yellow, and re d signals do not change. Ensure signals displaying yellow at the start of PE yellow clearance remain yellow and display for at least 3 s. Ensure “Walk/Walk” indications change to “Don’t Walk” immediately at the interval start. Ensure yellow signals prog rammed as track or fire lane signals remain yellow, and green and red signals do not change.
d.PE Red Clearance Ensure yellow signals change from yellow to red, and red and green signals do not change.
e.Track Green Ensure signals programmed as track ( or fire lane) signals change to or remain green and all other signals change to or remain red. Ensure Intervals 4, 5, and 6 are user programmable to zero during emergency vehicle preempts.
f.Track Yellow Ensure the track yellow interval is the yellow in terval for the track (or fire lane) signals. Ensure all other signals remain red.
g.Track Red Ensure the track red interval provides all -red time for track or fire lane clearance.
h.Minimum PE Duration Ensure the preempt sequence does not end until th e preempt input signal is removed, and the minimum duration time expires. Ensure each signal is user programmable for red, red flash, yellow flash, or green using the keyboard. As an alternative, ensure a limited cycle is programmable for railroad preemp ts.
i.Return Yellow Clearance Ensure return yellow clearance provides a solid yellow clearance for green or flashing yellow indications; red and flashing red indications display solid red; and the interval skips if programmed to zero.
j.Return Red Clea rance Ensure the return red clearance is an all -red clearance in preparation for return to the normal cycle. Ensure return phases are user programmable using the keyboard.
825.02 Traffic Signal Controller Assembly
B.Cabinet Requirements
1.Design Requirements Provide cabinets with the following characteristics: Completely weatherproof, to prevent entry of water; Constructed of unpainted sheet aluminum at least ⅛ in [3 mm] thick; Contains no wood, wood fiber products, or flammable materials; Neat and uniform welds; Un-welded seams sealed with cle ar or aluminum weather -seal compound; Vertical shelf support channels, with single continuous slots (not fixed notches or holes), to allow for shelf adjustments; Sufficient shelf space to accommodate the following: A controller unit 12 in [0.3 m] high, A 12-channel NEMA conflict monitor, and The number of NEMA loop -detector amplifiers specified in Table 825:1, “Controller Dimensions and Characteristics.” Equip the cabinet with the following: A commercially -available, thermosta tically -controlled fan with a capacity meeting NEMA requirements, with at least 2 CFS [0.05 CMS]; An adjustable thermostat with a range from 70 °F to 110 °F [20 °C to 43 °C]; and An air intake and exhaust vent. Securely mount a filter to the air intake ven t so air entering the cabinet passes through the filter. Ensure the air intake vent is large enough to use the entire filter. Provide the minimum filter dimensions recommended by the manufacturer for each cabinet size defined in Table 825:1, “Controller Dimensions and Characteristics.” Place a screen over the air intake and exhaust vent. Provide a screen with openings no greater than 0.012 in² [8 mm²]. Ensure the exhaust vent is large enough to prevent back pressure on th e fan. Provide each cabinet with a unique serial number of at least ¼ in [6 mm] high numbers. Stamp the serial number on the upper right -side wall of the cabinet near the front, or engrave on a metal Mylar plate and attach to the cabinet with epoxy or alu minum rivets. Mount a ground fault circuit interruption type, duplex receptacle to the lower front right side wall or on the door, and wire it to the load side of the 20 A circuit breaker.
2.Back Panel Provide back panels with the following characterist ics: Designed to accept the minimum load switches as shown on the Plans; Hinged at the bottom, folding down and out from the top and allowing access for maintenance of all components (load switches, relays, etc.); and Allows access to the back of the back panel in less than 2 min using standard tools. TRAFFIC SIGNAL CONTROLLER ASSEMBLY 825.02 The Department will not allow printed -circuit back panels or components mounted behind the panel, except transient suppression devices for relay coils. Number or identify wire termination points on the back o f the back panel to correspond with the labeling on the panel face. Bring outputs from the controller to the load switches, and outputs from the detectors to the controller, through posted binder head screw terminals with removable shorting bars. Support load switches and flashers with brackets designed to accept all NEMA load switches and flashers and prevent vibration from dislodging them from the back panel sockets. Bring load switch outputs through posted binder head screw terminals. Connect field wi ring for signal heads at this terminal strip on the back panel. If the Contract requires, provide additional load switches for phasing.
3.Detector Panel Mount a loop detector panel on the left side of the cabinet. Ensure the panel provides the following: Connections between loops at the street and detector amplifiers, Pedestrian call isolation, and Connections between detector amplifiers and the controller unit. Provide a three position detector test switch per detector in the cabinet. Bring in puts from the loops through posted binder head screw terminals, and outputs from the detectors to the controller through posted binder head screw terminals with removable shorting bars. Equip detector harnesses for shelf mounted units with an MS3106A -18-1S connector, and wire the harness in accordance with Table 825:6: Table 825:6 Detector Harness Wiring PIN number Function A AC common B Controller unit logic ground C 120 V (AC) D Loop E Loop F Controller detector call input G Spare H Ground bus I Controller detector call input J 120 V (AC) output from green load switch for this phase Provide an on -off-momentary toggle switch for each vehicle and pedestrian phase that allows the user to disconnect the detector input for that phase from the controller unit, or place a call to the controller. Ensure the momentary position places a call t o the controller, the on position
825.02 Traffic Signal Controller Assembly
connects the detector to the controller unit, and the off position disconnects the detector from the controller unit. If using a detector rack, provide a detector panel, loop amplifiers, and associated wiring in accordance with Section 828, “Vehicle Loop Detector and Loop Detector Wire.”
4.Cabinet Door Provide a cabinet with one door in front. Attach the door to the cabinet using three hinges with unremovable stainless steel pins or a full leng th piano hinge with stainless steel pins spot welded at the top of the hinge. Provide stainless steel pins in accordance with ASTM A320 B8F. Mount the hinges to allow removal from the door or cabinet only when the door is open. Ensure the bottom of the door opening extends at least to the bottom level of the back panel. Fit the cabinet door with a Number 2 Corbin lock with a three point latch, at least a ¾ in [19 mm] diameter shaft, and a cast aluminum or stainless steel handle that is lockable in the cl osed position with a padlock. Provide a lock and latch designed so the handle will not release until the lock releases. Provide one key for each cabinet. Install the lock clear of the handle arc. Provide a gasket at least ⅜ in [9 mm] thick as a permanen t dust and weather resistant seal in the channel cabinet door facing. Provide a nonabsorbent gasket material that maintains resiliency after long term exposure to the outdoor environment. The Department will allow an L-bracket instead of the channel if t he gasket fits snugly against the bracket and provides a permanent dust and weather resistant seal around the entire door. Provide a locking auxiliary police door in the cabinet door allowing access to a panel containing a signal shutdown switch, flash swi tch, and a manual -automatic switch. Provide a standard ¼ in [6 mm] two -conductor phone jack to accept a manual push button telephone. Equip the police door with a gasket of the same specifications as the main cabinet door, and provide one brass key per a uxiliary door. Rivet a 12 in × 17 in [0.30 m × 0.43 m] heavy -gauge vinyl -plastic pouch to the inside of the cabinet door. Ensure the pouch can accommodate a copy of the cabinet wiring diagram, controller manual, and accessory documentation.
5.Wiring Provide neat wiring in the cabinets, routed so that opening and closing the door, or raising and lowering the back panel does not cause twists or crimps. Provide wiring harnesses that are braided, sheathed in nylon mesh sleeving, or of PVC or polyethylene in sulated jacketed cable. Provide PVC jacketed cable for wiring leading to the cabinet door and jacketed cable for loop detector harnesses. Provide the following sizes of stranded copper conductor wire: At least No. 22 AWG in the cabinet; At least No. 10 AWG between the main power circuit breakers and the signal power bus; and At least No. 16 AWG for wires carrying individual signal lamp current. TRAFFIC SIGNAL CONTROLLER ASSEMBLY 825.02 Provide all wires and insulation rated to at least 600 V, and ensure AC service lines can carry the maximum circu it current. Provide white conductors for AC common, and green conductors for equipment grounding. The Department will not allow these colors to be used for any other conductor. Provide a 50 A barrier terminal block with at least three binder head screw terminals and one compression fitting (designed to accept up to No. 4 AWG stranded wire) for connecting the AC power lines. Isolate AC wiring in the path from the terminal block to the transient surge suppression device and bundle separately from all othe r wiring in the cabinet. Provide permanent terminal identification as shown on the Plans, in accordance with the cabinet wiring diagram, and the following: As close to the terminal strip as possible; Not on any part easily removable from the terminal block panel; Not obstructed by cabinet equipment; On both sides of the panel for through -panel solder lugs or other connectors; A number and function designation for each controller input and output function at each terminal point in the cabinet; A number for e ach load switch socket; For each flash transfer and power relay base; A function designation for each harness in the cabinet on the connector end; For the flasher socket; and For other sockets in the cabinet. Make all NEMA controller unit and conflict moni tor connector pinouts, except for load switch inputs to the conflict monitor, available on binder head screw terminals on the back panel. Provide a controller unit harness (A, B, C, or any combination of the three plugs) long enough to reach any point 15 in [0.40 m] above the timer shelf. Provide a conflict monitor harness, and any auxiliary harnesses required by the Contract, long enough to reach 24 in [0.60 m] from the conflict monitor shelf. Provide copper ground buses for the power supply neutral (comm on) and chassis ground. Jumper the AC neutral and chassis ground buses together with at least No. 10 AWG wire. Isolate the logic ground from the AC neutral, and end it on a logic ground bus that accepts 20 No. 20 AWG stranded wires. Equip the circuit bre akers with solderless connectors installed on the right side wall or the lower right hand side back panel inside the cabinet. Ensure the breakers are easily accessible and positioned so the rating markings are visible. These circuit breakers are in addit ion to auxiliary fuses required by the Contract to protect component parts. Protect the load side of the main circuit breaker with a lightning surge suppressor (EDCO ACP - 340, or an equivalent reviewed by the Department's Traffic Engineering Division and ap proved by the Resident Engineer). Connect the suppressor ground connection to the cabinet, and the suppressor to the line filter in accordance with manufacturer recommendations. Provide at least No. 10 AWG wire to connect the suppressor, line filter, and load switch bus.
825.02 Traffic Signal Controller Assembly
Install a relampable fluorescent light, with a switch, in the cabinet. Ensure the light turns on when the cabinet door opens, and off when the cabinet door closes. Place transient suppression devices on the coil side of all relays in the cabinet. Provide direct - current relay coils with at least a reversed biased diode across the coil. Equip each AC relay with a metal oxide varistor, or equivalent suppression device, across coils. The Department will allow Resistor Capacitor (RC) networ ks. Except where soldered, provide wires with lugs, or other fittings approved by the Resident Engineer, to attach binding posts. Ensure the outgoing traffic control signal circuits are the same polarity as the line side of the power source. Provide a swit ch on the cabinet door inside face and label it “Auto -Flash.” When the switch is in the “Flash” position, ensure that calls for flashing operation do not remove the power from the controller unit and allow normal operation while the intersection is in fla shing operation. When the switch is in the “Auto” position, ensure the operation is in an automatic mode with the signals on. Provide a three -position switch, near the “Auto -Flash” switch, to stop the controller unit and auxiliary equipment and label it “Stop Timing .” Label the top position “Automatic Operation ,” the middle position “Stop Time Off ,” and the bottom position “Stop Time On .” Provide a controller power on/off switch. Wire the cabinet so that activation of the conflict monitor causes the con troller unit, and any auxiliary equipment, to stop timing. Wire conflict and manual flash for all red. Ensure the red enable and remote reset from the conflict monitor can be terminated on the back panel face.
C.Conflict Monitor Provide NEMA Plus conflic t monitors in accordance with NEMA TS -1 with the number of channels shown on the Plans. Provide additional channels as shown on the Plans.
D.Solid -State Load Switch Provide solid -state load switches with the following characteristics: Solid -state construction; Meets Section 5 of NEMA TS -1; “Triple -Signal Load Switches” type; and Indicator light for each circuit that illuminates when a “true” input occurs.
E.Two -Circuit Solid -State Flasher Provide two -circuit solid -state flashers with the following characteristics: Solid -state construction; Contains no electromechanical devices; Meets Section 8 of NEMA TS -1; Voltage range from 95 V to 135 V (AC); Nominal voltage of 120 V (AC); TRAFFIC SIGNAL CONTROLLER ASSEMBLY 825.02 Constructed of easily replaceable components; Operating frequency from 57 Hz to 63 Hz; Designed to operate at ambient temperatures from −30 °F to 160 °F [−34 °C to 71 °C]; and Type III unit (dual circuit rated at 15 A per circuit).
F.LED Traffic Signal Battery Backup System When specified in the Contract, provide a battery bac kup system in accordance with the latest NEMA 3R or 4 requirements. Obtain the following from the equipment manufacturer and submit to the Resident Engineer upon request: Certification showing that the equipment model has been tested and approved in accor dance with NEMA; Service warrant; Instruction books; Service manuals; List of generic part numbers for service personnel; and Complete installation instructions.
1.General Equipment Ensure the system provides power for normal signal operation, flash oper ation, and combination mode. Provide a system designed for outdoor applications meeting the traffic industry environmental standard and compatible with NEMA TS-1 and TS -2 controllers and cabinets. Provide a system that includes cables, wiring harnesses, battery cables, and components for operation.
2.System Equipment Provide equipment for LED traffic signal battery backup systems in accordance with Table 825:7: Table 825:7 Equipment Properties for LED Traffic Signal Battery Backup Property Requirement Output Power ≥1,200 VA Active output power ≥875 W Output/Input Voltage 120 V (AC), 60 Hz Output Waveform, pure sine wave <5% THD Input Current 12 A – 15 A Input voltage variation 92 V – 135 V (AC) Typical efficiency >95% Maximum Charge Current 6 A
825.04 Traffic Signal Controller Assembly
Table 825:7 Equipment Properties for LED Traffic Signal Battery Backup Property Requirement Operating Temperatures −30 °F – 165 °F [−34 °C – 74 °C] Typical Transfer Time 2 ms – 4 ms Audible noise at 1 m <55 dbA Lightning/Surge protection Passing ANSI/IEEE C62.41/C62.45 Cat A and B Typical battery recharge time 90% in 4 hr Warranty 36 months on components Computer interface port RS-232 Protect the unit with automatic electronic short circuit or overload shutdown, automatic over temperature shutdown, and voltage adjustment that activates due to input voltage variation. Provide an LED indicator for “online ,” “on battery ,” “low battery overload ,” and “fault .”
3.Battery System When specified in the Contract, provide sealed, absorbed glass mat or gel, 12 V batteries. Ensure the number of batteries and amp -hour ratings are capable of operating the battery backup system in full time signal operation at 875 W for at least 3 hr. Provide batteries with interconnect wiring, corrosion -resistant mounting trays, and brackets. Provide a regulated, temperature compensated battery charging system. Provide batteries with 3 -year full -replacement warranties.
4.Battery Cabinet When specified in the Contract, ensure the battery cabinet is mountable on the controller cabinet side. Provide a cabinet of ⅛ in [3.17 mm] thick alumi num, Type 5052 -H32 housing, with a natural aluminum finish, sturdy aluminum shelves, and lockable door.
G.Documentation Submit the following documentation with each cabinet: Three accurate and legible cabinet wiring diagrams; and One manual for the controller, conflict monitor, load switch, flasher, and detector units.
825.03 Equipment — Vacant
825.04 Construction Methods
Install vehicle -actuated solid -state traffic signal controllers at locations shown on the Plans and in accordance with the manufacturer’s recommendations. SOLID -STATE FLASHING CONTROLLER 827.02
825.05 Method of Measuremen T — Vacant
825.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: TRAFFIC SIGNAL CONTROLLER ASSEMBLY Each Include the cost of additional load switches and conflict monitor channels in the contract unit price for the Traffic Signal Controller Assembly . SECTION 827 SOLID -STATE FLASHING CONTROLLER
827.01 Description
This work consists of providing, installing, and programming (initial) solid -state flashing controllers and solid -state time clocks.
827.02 Materials
Provide the following types of flashing controller as shown on the Plans: Type I - Provide a flashing controller in accordance with Subsection 827.02.A, “Controller.” Type II - Provide a flashing controller, including a solid -state time clock, in accordance with Subsection 827.02.A, “Controller,” and Subsection 827.02.B, "Time Clock."
A.Controller Provide a solid -state, NEMA two -circuit Type III, 15 A flashing controller .
B.Time Clock Provide a solid -state single -circuit time clock, except for the relay output. Ensure availability of components to the Department for servicing 5 years after expiration of the manufacturer’s warranty. Alternatively, ensure availability of the components from industrial electronics suppliers. Provide an integral keyboard capable of setting the time, date, day of week, and the relay output operation. Provide a keypad with marked key functions. Ensure all data for programming the unit and reviewing the stored program is clearly displayed without using auxiliary devices. Provide a system capable of automatically changing between daylight savings time and standard time, once programmed. Ensure a hardware change, a software change, or both can override the automatic changes. Ensure the display verifies data before it is entered into the program. Ensure the programmer can correct data before its entry. Ensure the system allows alteration of data before entry. Provide for alteration of individ ual program steps without disturbing other program steps.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 833–852 of 935.