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eagle traffic controller manualWhen properly configured, the TRPS mode has the greatest potential to provide optimal operation due to its ability to accommodate abnormal traffic conditions such as incidents, special events, and holiday traffic. Table 7-3 summarizes the two distinct modes of traffic signal controller operation - isolated and coordinated. A signal operating in isolated mode can also be said to be operating free or uncoordinated. Traditionally, See also Chapters 3 and 4 of this Handbook for additional information on some special control concepts. When a vehicle The phase terminates if all detectors for the phase If actuated phases terminate before using all Once activated, the duration of the green display may vary depending on the number of vehicles detected. A signal is pre-timed if all phases are fixed, and is fully actuated if all phases use detection. A semi-actuated signal has a mixture of pre-timed and actuated phases. In this case, the main-street through phases need not have detectors, and are served every cycle regardless of demand. A coordinated signal must operate with a fixed-duration cycle. In a typical semi-actuated signal, if one or more actuated phases do not require all their allocated portion of the cycle, unused time is automatically re-assigned to the main street, non-actuated phases, which always terminate (turn yellow) at the same point in the cycle regardless of how early they commence (turn green). These situations are commonly encountered in dense grid street networks ( 1 ). On making the decision to install a traffic signal, first consider fully actuated control. Its traffic-responsive capability adjusts cycle and phase (split) lengths to fit changing demands from cycle to cycle. Rarely do approach traffic volumes at an isolated intersection remain predictably constant over a long period. Because all phases usually do not peak simultaneously, it should not be assumed that a full-actuated signal operates on a fixed cycle length even with high traffic demand.http://www.aricam.com.tr/webupload/crate-gx-130c-owners-manual.xml
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Because of its skip-phase capability, the 8-phase dual-ring controller may operate as a basic two-phase controller under light traffic conditions; in the absence of demand, the controller unit ignores that phase and continues around the ring seeking a serviceable phase ( 1 ). Traffic control without separate left-turn operations can minimize delay for all movements including left-turns. Asante, et al. provides a set of guidelines for left-turn protection ( 2 ). The report provides guidance on: However, in some cases, this will require the elimination of parking near the stop line in order to make room for the additional width needed for the left turn pocket. Some of these applications include: Signal controller unit hardware has evolved from the days of motor-driven dials and camshaft switching units to the adaptation of general-use microprocessors for a wide variety of intersection and special control applications. Later, several manufacturers introduced semi- and full-actuated controllers equipped with vacuum tube circuits for timing functions. The traffic engineer adjusted interval and phase timing via knobs on a control panel. Transformers and vacuum tubes in these analog units generated considerable heat, requiring forced-air circulation and filtering in controller cabinets. Some manufacturers retained solenoid-driven camshafts for lamp switching, while others used stepping relay-driven stacked rotary switches and encapsulated relays. Short component life and timing drifts characterized these controllers. The high-amperage heater circuits and high-voltage B plate circuits once required for vacuum tubes passed from the scene. The mid-1960s saw transistorized circuits first used for timing and phasing functions. Lower operating temperatures increased component life, and digital timing ensured timing accuracy and eliminated fluctuations. During this period manufacturers also introduced the solid-state load switch for lamp circuits.http://www.mitconline.in/www.mitconline.in/uploaded_files/fck/Image/crate-gx-15-manual.xml Wide variations in component and equipment arrangements from manufacturer to manufacturer also prevailed during the 1960s. Designs varied from those in which all timing and phasing components were placed on a single circuit board to those that used modular, plug-in phase and function-oriented designs. These very small chips were linked together in circuits and sealed within an IC envelope to form the microprocessor. This development led to microcomputers - small, lightweight, low-cost units used practically everywhere today. They are used in all modern traffic signal controllers. The same physical controller may operate quite differently when loaded with a different software package. These standards, and the Advanced Transportation Controller (including the ATC 2070) are discussed in Section 7.6. This requires assignment of green time to one movement, then to another. If left turns have separate controls, and at complex intersections, there may be more than two conflicting movements. The length of time taken to complete one round of service for all conflicting movements is called the cycle length, and the allocation of the cycle length between the conflicting traffic movements is called the split. This is called platoon progression and is achieved by coordinating the operation of adjacent signals. Signal coordination is most commonly achieved by operating adjacent signals at the same cycle length, with a pre-determined offset between the start of the cycle at one intersection and the start of the cycle at the next. See Chapter 3 for further discussion of coordination timing parameters. Controllers, therefore, allow the user to establish multiple sets of these basic coordination timing parameters. Each such set is referred to as a timing plan or timing pattern, and one timing plan or timing pattern is in operation at any given time.https://congviendisan.vn/vi/bose-wave-music-system-multi-cd-changer-manual The timing plan or timing pattern in operation can be changed either by a time-of-day schedule stored in the controller or by a command from a master device. The former allow the user to divide the cycle into any number of intervals, with the duration of each interval being set by the user. The user then defines which output circuits are switched on during which intervals. For example, a particular interval may be used to time part of the green for one vehicle movement, part of the flashing don't walk for a pedestrian movement, the yellow for another vehicle movement, and part of the red and steady don't walk for others. The user can also specify a start-of-cycle offset for signal coordination. The interval durations, output definitions, cycle length, and offset can all be varied from one pattern to another, and therefore can be varied during the day. If an interval does not use all of its allocated time, the spare time can be assigned to a following interval. Some controllers allow the user to create quite elaborate customized logic for controlling interval occurrence and duration. They divide the cycle into phases, with each phase having five pre-defined intervals - green, yellow and red clearance for vehicle control; and walk and flashing don't walk for pedestrian control. The user specifies the duration of each of these intervals, or in the case of the green interval, the minimum and maximum duration. If the signal is coordinated, the user also specifies a split time for each phase, and a start-of-cycle offset. If coordinated, the split times for all phases in a ring must sum to the cycle length. Each phase is assigned to a timing ring (Figures 7-2 and 7-3). Phases assigned to the same ring time sequentially, but rings time concurrently. Therefore, if the controller is using two rings, two phases can be timing simultaneously and independently.http://elmariachimexican.com/images/canon-s200-powershot-manual.pdf Within a concurrency group (between two barriers) the phases in different rings can time independently, but all rings must cross the barrier (move to a different phase concurrency group) simultaneously. From one pattern to the next, the user may vary the cycle length, offset, split, and phase sequence. Two actuated left turn phases on the same street can time independently, with say the westbound turn phase receiving less time than the eastbound in one cycle, and the opposite occurring in the next cycle. For this reason, and their ease of setup and additional actuation features, phase controllers have become the dominant type. This works very well for most intersections, but does not provide the flexibility needed for unusually complex intersections. Also, if fixed-time control is sufficient and left turn phasing is not prevalent, such as often occurs in the central business districts of large cities, the interval controller is adequate. Interval controllers therefore have remained in use, although their numbers are dwindling as phase controllers have expanded to accommodate more phases and rings, and have added features such as redirection of outputs. Each phase in a phase controller can be operated either pretimed (fixed time) or actuated. Most modern controllers meet most or all of these minimum requirements and most controllers also provide additional functionality not yet standardized. Such connections may be permanent to a remote master or computer, or temporary to a laptop computer used by field personnel. Ethernet is increasingly being used instead of serial communications. As special serial port may be used to communicate with in-cabinet equipment in the case of a serial-bus cabinet (see NEMA TS 2 and ATC sections below). A load switch uses a low voltage direct current output of the controller to switch a 110v AC circuit on or off, thus turning on or off a signal display viewed by motorists or pedestrians. For a particular phase, one circuit is switched off just as another is switched on. If a malfunction is detected, the MMU automatically places the signal in an all-red flashing state, overriding the outputs of the controller. Modern controllers can sense this condition and report the malfunction state to a master or central computer. Special schedules can be created for holidays or other dates on which traffic conditions are unusual. The controller's clock, which keeps track of date, day of week, and time, is regularly compared to the entries in the schedule. No external communications are required. This mechanism is often used as a backup when an external pattern selection method fails. This method is commonly used. When the combination of active (voltage on) and inactive (voltage off) wires changes, the combination is used by the controller to look up which pattern or plan to change to. Traditionally, this method was used to independently select which of several pre-defined cycle lengths, offsets, and splits to use, thus emulating the selection of dial, offset, and split keys in an electromechanical controller. Use of this method is declining. This method is commonly used. If the controller loses communications with the source of pattern commands, it can automatically revert to using its internal time-of-day pattern selection schedule. The same communications link is typically used to receive status information from the controller, and to enable remote changes to controller parameters. Before controllers had internal clocks, this was typically achieved by connecting the controllers to a master unit using the hardwire interconnect method described above. Once each cycle, one of the input wires changes its state for a second or two (called a pulse), thus signaling the commencement of the background cycle to all connected controllers simultaneously. Each controller then times its own offset from this common reference point. Use of this hardwire interconnect method is declining, in favor of time base coordination. All controllers in a coordination group can be configured to use the same time of day (say midnight) as the reference point for offset calculation. The common background cycle is assumed to start at this time of day, and each controller can time its own offset from this common reference point. This is called time base coordination. Clocks can be reset using any of the following techniques: Depending on the model of controller, operationally significant drift can require manual reset after only several weeks of operation. When the controller senses this pulse, it sets its clock to the pre-defined time of day. As long as all controllers in the coordinated group receive the same pulse, it doesn't matter if the clock of the master unit is not entirely accurate. Even signals under the command of different central computers can be coordinated as long as each central computer has its clock set accurately. Controllers provide two selectable maximum limits (commonly referred to as MAX I, and MAX II). Red clearance is not always needed. Maximum green recall places a call for the phase and when served prevents it from terminating prior to expiration of the maximum green timer. Therefore, a phase with continuing demand may remain green for some time before a conflicting call is registered that starts the timing of the maximum green. Phases may The phases within a ring are numbered Each ring may contain Any number Conflicts between phases in different rings are Barriers ensure conflicting At a barrier, rings terminate If a call does not exist For example, referring again to figure 7-3 in the For example, The duration This parameter overrides Green Extension, In the absence of stopline detectors, it can be used to count the number of vehicles waiting in front of the advance detectors and increase the minimum green, if needed, to clear this queue. The gap is reduced gradually over time, requiring a progressively greater density of approaching traffic to avoid termination of the green. Table 7-8 and Figure 7-4 describe phase sequence options for a signal with odd numbered phases serving left turns, and even numbered phases serving their opposing through movements. Typical left turn sequence options are leading lefts, lead-lag lefts, and lagging lefts. One such sequence can be used on one street (one barrier group), while a different sequence is used on the other street. Phase 2 and 6 then run together until The phases As shown in figure 7-4, the above phase As demand ends or maximum green is reached on Phase Phases 1 and 5 then terminates However, phase sequence needs to be chosen with care if the left turn movement can be made both protected and permissively, and a traditional five-section signal head is used (two left turn arrows and three balls). The driver assumes the on-coming traffic also sees a yellow ball and will stop, when in fact the on-coming traffic may continue to see a green ball and not stop. In this case the permissive indication (the flashing yellow arrow) tracks the opposite-direction through phase instead of the same-direction through phase. They are grouped into three categories: Some examples of non-standard phasing used to control two closely-spaced intersections are discussed in Section 3.9 and in the following section on diamond interchanges. One example is conditional re-service of a leading left turn phase following its opposing through phase (see Figure 7-5) - the left turn phase appears twice in the cycle, both before and after its opposing through phase, but only if the through movement is sufficiently light.Energization of the hold input while timing Energization of the hold The phase to be omitted After the beginning of the subject phase Such termination The Force-Off The registration The registration of a serviceable The registration of a serviceable The formerly active The operation depends Upon the removal of activation from this input, During Stop Timing, vehicle The operation When concurrent interval timing exists, The 2 inputs are designated Call to Non-Actuated Only phases equipped Upon removal of Upon activation, The controller Modern controllers can provide similar functionality without the need for a special mode of operation, as described in section 3.9. These are referred to as the 3-phase and 4-phase sequences and are described in Table 7-12. The operation can change between the sequence options in response to external commands. The City of Dallas provides for four sequence variations. The two sequence variations shown in Figure 7-7 are used by the Texas Department of Transportation. Typical detector locations for operation of the controller unit in 3-phase, lag-lag, or four-phase (with overlaps) sequencing, with locally produced external data, are shown in Figure 7-8. Software also provides the option for use of any compatible combination of phases at the ramp intersections, in response to computer-issued command data, as shown in Figure 7-9. The cycle lengths for the 4-phase sequence were 40 to 80 longer than for the 3-phase sequence. Expect similar reductions in cycle lengths at locations in other isolated and interconnected systems, as long as the left-turn movements remain within reasonable limits, and storage is available between the off-ramp (frontage road) connections.If the controller includes more than one phase sequence, the sequences can be changed to accommodate operational requirements. Figures 7-6 and 7-7 show Phase 2 follows Phase 3 if there is a demand Phase 3 follows Phase 2 if there is Subsequent vehicle actuations and For purposes of The Phase 1 overlap This fixed time period is determined The controller unit proceeds then to Phase 2 green to accommodate the above Since the controllers are full traffic The array of flow lines The software for Single Point Freeway Interchange Operation The design provides a basic six movement operation as shown in Figure 7-11. It is similar to typical five-phase control at normal intersections, except that pedestrians and right turns may require special treatment. It is difficult to efficiently allow pedestrians to cross the cross-street, and pedestrians crossing the ramps may require separate controls at left and right turn slots. The SPUI and the tight urban diamond interchanges with a distance of 250 to 400 ft (76 to 122 m) between ramp connections (or frontage roads) were judged viable competitors. Due to longer cycle lengths and increased delays, the SPUI is not recommended where continuous frontage roads exist when the SPUI and the frontage roads are grade-separated with one elevated above the other. Through the use of communications to a supervising master or central computer, the controller receives and implements a variety of commands. In closed-loop systems or central computer control systems, a two-way communications system returns information from the local unit to the central facility. The control status of the local controller and timing plan in effect exemplify returned local-oriented information. In many systems using two-way communications, system detector information is also returned to the supervising master unit or central computer. A copy of the controller's data can be stored in a central database, modified, and downloaded to the controller in whole or in part. Methods vary from system to system, and traffic engineers must remain aware of the resulting impacts on traffic flow and operations safety. This standard defines functionality, interfaces (physical and logical), environmental endurance, electrical specifications, and some physical specifications, for the following components: Although maximum dimensions are specified for the controller, a manufacturer is free to make a unit of any smaller size from any material, in any shape, with internal sub-components of any type, as long as it meets the other requirements of the standard. There are no requirements that enable interchangeability of sub-components or software between controllers from different manufacturers. It is assumed that the whole controller and its software will be swapped out when a change is made. The standard specifies a range of alternative cabinet sizes, all having shelves, and a door on one side only. Signal phasing and timing functionality discussed above applies only to phase (actuated) controllers, the predominant type in use today. This option reduces the amount of wiring in the cabinet by providing an analog-to-digital converter and aggregator close to the detectors or load switches that are the source or destination of the inputs or outputs. Then a simple serial communications cable connects these bus interface units to the controller. Each bus interface unit supports multiple detectors or load switches. Two standards are currently in place: Unlike the NEMA TS 2 standard, the ATC 2070 standard specifies every detail of the controller hardware and internal sub-components, but does not specify any application software functionality It requires the OS-9 operating system, a minimum of 4 MB of dynamic random access memory (RAM), 512 KB of static RAM, and 4 MB of flash memory. It also specifies the form and function of the following modules and a standard chassis and card cage into which card modules from any manufacturer can be inserted: The original Model 2070 specification included provision for an auxiliary five-card 3U VME cage within the chassis with the central processor being on a VME card. This option is retained in the ATC 2070 specification, but has not proven popular. The VME cage and processor is rarely specified or supplied.Most ATC controller software for traffic signals adheres to the functionality specified in NEMA TS 2, and is functionally similar to a NEMA controller. It is a rack cabinet, with optional sizes, one or two racks, and doors in both front and back. The standard includes specifications for all cabinet components except the controller, detector cards, and load switches. It can be used with the ATC 2070 controller and TS 2 detector cards and load switches. Instead of a Bus Interface Unit, it calls for a Serial Interface Unit that integrates the serial interface into the input or output connector, and uses a different protocol than that used in the BIU. This protocol is the same as used internally in the ATC 2070. It is a new standard and it will take some time before compliant components are readily available and large numbers of ITS cabinets are deployed. ATC 2070 controller software needs some modification to operate in an ITS Cabinet. A new version of the ATC controller will allow the use of different physical forms, different central processing units, and perhaps different operating systems. Additional communications ports and memory are also planned. An application program interface standard will facilitate the portability of software applications between controllers using different processors and operating systems, and will allow sharing of system resources between multiple applications (from different suppliers) operating simultaneously on the same controller. These standards cover the hardware for cabinets and all components, including the controller. As with the ATC standards, the Model 170 specifications do not specify software functionality. These specifications date back to the 1970s. The Model 170 controller is based on the Motorola 6800 processor, which is no longer manufactured. Processing power and memory are severely limited and software written for the Model 170 controller cannot be readily expanded to add features such as support for more than 8 phases and two rings, or full NTCIP communications. As replacement parts are no longer manufactured for some components, they will have to eventually be replaced. Caltrans developed the Model 2070 controller as its replacement. However, Model 170 software does not automatically run on an ATC 2070. Although using a somewhat more powerful microprocessor, the Model 179 has not achieved the same acceptance as the Model 170. However, the Model 170 controller has limited capacity for supporting advanced software applications, such as full NTCIP support or use of more than eight phases in two rings. Obsolescence of the hardware also makes the Model 170 controller a poor choice for long term applications. Agencies often have a preference for one type of cabinet based on factors such as training of field personnel, existing inventory of spare components, aesthetic considerations (mainly size of cabinet), and cabinet placement policies. If a large NEMA cabinet is used, either the ATC or NEMA controller may be suitable. If a rack-mount cabinet (e.g., Model 33x or ITS Cabinet) is preferred, then the ATC controller (or Model 170 if feasible) is needed. Some manufacturers offer a small cabinet and integrated controller. This is often referred to as a CBD cabinet. Some such products are based on the ATC specifications but don't adhere to the ATC 2070 standard for physical size and modularity. The latest NEMA and ATC controllers can operate in either of the standard serial bus cabinets, and allow the user to operate any software compatible with the ATC 2070. If the software that comes with a NEMA controller provides unique features that are needed, that controller may be the best choice. If that software is also available, or only available, for use on an ATC controller, then the ATC controller may be preferred. An ATC controller, and some NEMA controllers, can be purchased separately from its software, allowing more competitive procurement if a particular software package is needed. It is usually preferable to limit the number of different controller and cabinet types in use. Most agencies cannot afford to perform a wholesale replacement of all controllers overnight, but do the changeover gradually. If cabinets are being replaced for other reasons, this presents an opportunity to also replace the controller, and it may be appropriate to change to a different type of cabinet. However, an ATC can operate in any type of cabinet of sufficient size, if it has the appropriate interface module.Traditional NEMA controllers cannot operate software written for either the Model 170 or ATC. Therefore, a change between these types of controllers will invariably involve different software and user training for the new software. Most agencies try to avoid having more than two different types in use at the same time. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Start Free Trial Cancel anytime. Report this Document Download Now Save Save EPAC300 Programming Basics For Later 0 ratings 0 found this document useful (0 votes) 1K views 17 pages EPAC300 Programming Basics Uploaded by Mike Anderson Description: How to program an EPAC300 for 2 or 4 phase operation with other options Full description Save Save EPAC300 Programming Basics For Later 0 0 found this document useful, Mark this document as useful 0 0 found this document not useful, Mark this document as not useful Embed Share Print Download Now Jump to Page You are on page 1 of 17 Search inside document It does not include all the features available on the controller unit, nor does it provide any information on NEMA cabinet hardware other than TS1 operation of the controller unit. The purpose of the guide is to get the collector programming a pre- timed intersection of up to 4 sequential phases plus 2 leading overlaps. It will also include how to set up night flash as well as choosing a second time plan. Further more advanced programming would be covered in a later version of this guide. Browse Books Site Directory Site Language: English Change Language English Change Language. Remember, this was ions before Lights to Go.To the right is a picture of what I came up with. This is the very first controller that controlled my Marbelite. Inside of my controller box, is a digital controller consisting of parts bought from a local Radio Shack. Inside are two identical circuit boards. One for each direction of traffic. Basically it is a modified 555 timer circuit copied six times over. When you trigger the timer from a button located on the front of the unit, it starts counting and runs out. Then triggers the next timer, and then the next.and then resets itself. Also a digital numeric readout showed seconds left in the cycle. From the front panel I can monitor all of it's functions from light status, with it's neon indicator lights, to timing and flash modes. The box has two separate modes.