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 . 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.
827.02 Solid -State Flashing Controller
Provide operating instructions with each time switch. The Department defines a program step as the time and day(s) of the week when the output turns on or off. When instructed to turn the output on or off, ensure the system sets the instruction time to the minute and ensure the change occurs at the zero second of that minute. Provide a time switch capable of initiating at least six program steps. Ensure the time switch can execute five separate s kip plans programmed at least 1 year in advance. Use the integral keyboard to program skip plans. To program each plan, enter the beginning and ending dates for the time switch output deactivation. Ensure the time switch can skip durations from 1 day to 6 months. Ensure a skip plan can begin in 1 calendar year and end in the next consecutive year. Ensure the system allows entering one -day skips 6 days before the day to be skipped. After the one-day skip, ensure the time switch automatically resets and resumes normal operation. The Department will not require chronological entry of skip plan programs. Ensure review of the skip plan program without affecting the normal operation of the time switch. Ensure the display includes the skip plan number, the be ginning date, and the ending date. Provide a backup system to maintain timekeeping and the program for at least 48 hr at 77 °F [25 °C] that automatically goes online when the 115 V alternating current (AC) power source fails. When the line power resumes, ensure the unit automatically resumes normal operation and recharges the backup system. Provide a capacitive charging system. The Department will not allow batteries for the charging system. Ensure the unit displays a program loss indication if an AC pow er outage erases the time switch program. Provide a display with a discrete LED indicator and ensure the display can be reset from the integral keyboard. Ensure the display blanks and the output disables to conserve power when the time switch operates on the backup system. Ensure the unit displays the time, day of week, date, and the output relay condition. When using the 12 hr time format, ensure the unit displays “am/pm.” Provide a unit capable of switching to an alternate time display that includes s econds. Ensure a keystroke switches the display between the normal and alternate modes. Provide for program review on the clock memory, integral with the input. Ensure the program review does not affect the current time switch operation. Ensure the capab ility for mounting the time switch back panel to a backplate. Ensure that mounting holes provide a clearance for at least a No. 10 screw. Provide a time switch no larger than 4 in [100 mm] wide × 7⅜ in [190 mm] high × 3⅛ in [80 mm] deep. Provide a cover for the unit to protect the time switch from dust. Ensure easy removal of the cover to allow access to the field wiring terminals. A rain -tight cover is not necessary. Provide a terminal block capable of accommodating wire sizes from No. 20 AWG to No. 12 AWG to interface to the power line and the controlled device. Ensure that the time switch operates on 115 V (AC), 60 Hz power source, from 95 V to 135 V (AC) and from −30 °F to 160 °F [−34 °C to 71 °C]. Ensure that timing synchronizes with the power line. Provide a backup power source to maintain the timing when commercial power fails. When using the backup power, ensure timing remains SOLID -STATE FLASHING CONTROLLER 827.06 accurate within 3 sec per 24 hr period throughout the entire tempera ture range. Ensure changeovers between 115 V (AC) and the backup system do not alter the time. Provide a keyboard for system programming. Ensure the time set accurately to 1 s.
C.Cabinet Provide a weatherproof, aluminum alloy cabinet of at least 14 inch es [355 mm] high × 10 inches [254 mm] long × 5 in [127 mm] wide, to enclose (with ample space) the flashing controller and associated equipment of the type regularly supplied by the manufacturer and approved by the Resident Engineer. Provide a hinged door that allows access to the cabinet interior. Seal and weatherproof the door with neoprene gasket material. Provide a standard police lock and two keys. Provide identifiable terminals, connected to terminal boards, accessible without removing equipment fro m the cabinet. Provide a surge protector (EDCO SPA -100, or an equivalent approved by the Department's Traffic Engineering Division), with each flashing controller. Provide a circuit breaker in accordance with NEC.
827.03 Equipment — Vacant
827.04 Construct Ion Methods
Place and wire the Type I or Type II controller unit as required by the Contract.
827.05 Method of Measuremen T — Vacant
827.06 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: SOLID STATE FLASHING CONTROLLER Each Include the solid state time clock and the cabinet in the contract unit price for Solid State Flashing Controller . Include sign posts and concrete footings in contract unit price for sign posts in accordance with Section 851, “Galvanized Steel Sign Posts ,” and sign post footings in accordance with Section 804, “Conc rete Footings.”
828.02 Vehicle Loop Detector and Loop Detector Wire
SECTION 828 VEHICLE LOOP DETECTOR AND LOOP DETECTOR WIRE
828.01 Description
This work consists of providing and installing a solid state digital inductive vehicle loop detector and loops.
828.02 Materials
Provide and install the following materials in accordance with the latest edition of NEMA TS -1 or TS -2.
A.Detector Loop Wire Provide detector loop wire embedded in the pavement in accordance with Subsection 738.01, “Traffic Signal Wire and Cable.”
B.Shelf Mounted Detector Unit Provide a self -contained, self -tuning, solid state digital detector that automatically compensates for temperature variations and environm ental conditions.
1.Mechanical Requirements Provide a detector unit and power supply enclosed in a sheet -metal housing with a protective paint finish. Ensure that the case allows access to the interior assembly and allows parts testing and servicing. S upply each detector unit with a connecting cable. Insert a multi -terminal plug into the plug receptacle on the face panel of the detector to make an electrical connection from the detector to the incoming and outgoing circuits. Ensure detector replacemen t without disconnecting and reconnecting the individual wires.
2.Output Delay and Extend Supply the loop detector unit with programmable delay and extend output features.
a.Delay Output Provide a delay circuit variable to at least 20 s in 1 s increment s for delayed output. Ensure vehicle detection delay for the time period selected to prevent detector output until vehicle presence in the loop for the selected length of time. Ensure the vehicle delay timing resets each time the vehicle vacates the loop . Ensure the delay circuit immediately disables in the presence of 120 V (AC) on Pin J of the MS 3106A -18 1P connector for this channel.
b.Extend Output Provide a variable extend circuit for carryover output to at least 15 s in 0.25 s increments. Ensur e detector actuation extends after the vehicle leaves the loop. Ensure the timing circuit resets the after the extension expires. Do not disable the extend circuit in the presence of 120 V (AC) at Pin J of the connector.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 853–855 of 935.