Washing a car effectively takes more than soap and water; it takes proper equipment. At the heart of the operation is the motor. Motors actuate brushes, cars, water-hoses and more within a car washing system. Because these motors must operate for long hours under harsh conditions, motor selection presents a unique engineering challenge. For example, electric motors last longer, but can be more expensive. Conversely, hydraulic motors are more cost efficient, but reputed to suffer periodic oil leaks.Electric motors: advantages vs. disadvantages
While electric motors appeal to consumers because of their longer life, applications in water-rich environments can lead to issues. Water and electricity do not mix. Leaks, rust and corrosion are prevalent in a car-wash application and can lead to premature failure.
In addition to problems with water, an electric motor’s long life comes with a cost. Simply put, electric drive motors are more expensive. Typically, electric gear motors cost four to five times as much as a hydraulic motor with comparable performance. If repairs are required, electric replacement parts cost more as well. However, in an application that requires long life, the costs of an electric motor may be justified.The hydraulic motor solution
A hydraulic motor is more cost effective, but has the reputation of creating a mess. While hydraulic lines can break and lead to oily spills, hydraulic motors should operate indefinitely, if proper system maintenance is followed:
When water and metal is involved, corrosion is a concern. By design, hydraulic motors can withstand corrosion in a way that electric motors cannot. Unpainted and sealed hydraulic motors form a rust coating that allows the motor to adapt to a wet environment, without compromising motor performance.Parker light duty hydraulic motors for car wash applications
Parker Low-Speed/High Torque (LSHT) motors are used in conveyor systems, wheel polishers and/or brushes. They offer a two-pressure zone, high pressure shaft seal that does not require a case drain line back to the reservoir. This design reduces cost, while retaining possible leak points on fitting and hose lines. The internal flow passage of the motors allows oil to reach all internal components, keeping fresh oil at the internal bearing and ensuring seal shaft lubrication. Fresh oil for components means longer life.
Robust bearings withstand higher side loads for applications that may require chain or sprocket shaft connections such as the car conveyor. The rugged construction of the TK series motor can transmit over 23,000 lb-in of torque in a compact, 6 x 10 inch package.
Discover more about Parker’s motors used in car wash application motors.
Article contributed by Hersh Chaturvedi, business development manager and Kenney Ricker, product manager, Pump and Motor Division, Parker Hannifin Corporation.
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Check valves are typically thought of as a very simple component of a hydraulic process. They permit the flow of fluid in one direction and prevent flow in the opposite direction. Simple, right? However, these devices can be one of the best fail safes your process has against a very costly shutdown. Faulty valves can have enormous consequences if they are not functioning with the utmost precision.
Beyond flow control, check valves may also be used as a directional or pressure control in a system. If the pressure becomes higher on the wrong side of a valve, it will close and block flow in the opposite direction. This means the check valve will stop pressure spikes back to the pump. Depending on your process, fluid can flow from a pump through the system at very high speeds. If something in the process suddenly causes the fluid flow to be restricted, the pressure in the line can quickly increase by two to three times, causing damage to the system. The check valve should then close and block the pressure spikes back to the pump.Downtime can be very costly to the bottom-line
A check valve can end up costing companies thousands of dollars in replacement pumps and exponentially more in machine downtime. Downtime is one of the largest sources of lost production time in industrial processes and unplanned downtime can be one of the greatest expenses. When unplanned downtime happens, the cost of overhead is still there being consumed, and no value is being produced. These are the most obvious costs of unplanned downtime, but what about the underlying costs as well? Downtime also throws inventory levels off resulting in less than optimal on hand inventory which can lead to increased operational costs. Also, when employees have to focus on fixing a downtime issue this takes away from time they could be using to innovate and create growth opportunities for the company.Safety first
One of the highest concerns of a check valve failure is the safety. If a check valve fails, the potential for leakage or even a blow-out is a possibility. A blow-out occurs when the shaft-disk in the valve experiences a separation. This type of failure has occurred even when valves are being operated within their temperature and pressure limits, further justifying the utilization of a high quality product. While a catastrophic blow-out from a faulty valve may be rare, even the smallest of leaks can create safety hazards that can be dangerous for the operators. Ensuring that your check valves are well maintained, and of high quality can help mitigate these risks.Parker valves provide a durable, precise solution
Parker C-Series Check Valves have fully guided poppets. Their superior design eliminates wobble and erratic travel that can commonly occur with less durable ball check constructed check valves. The soft seal poppet on the check valves are standard for sizes up to 1/2” NPT, #10 SAE. They can withstand pressures up to 5000 PSI and flow rates up to 150 GPM. Customers around the world recognize the Parker brand as the benchmark for high performance and best in industry quality. In a product as small as a check valve, performance and quality can lead to big savings in the industrial process.
Article contributed by Matthew Davis, to be named, product sales manager, Hydraulic Valve Division, Parker Hannifin Corporation.
In today’s industrial manufacturing environment, hydraulic cylinders are complex devices that incorporate a wide range of components available in a multitude of sizes, configurations and materials. When it comes to complex hydraulic systems, cylinder specification can be a balancing act for OEM design engineers — as each design factor influences one or more of the many other design details to be considered for the application.
A complicated process
Even though hydraulic system design guidelines like NFPA and ISO exist, many industries have developed their own. Certain cylinder manufacturers offer options that present a wide scope of performance capabilities for standard components, minimizing the need for customization. However, exceptions to this remain. Working with an experienced engineering manufacturer can help to navigate and expedite the design process.
In this blog, we’ll look at some of the many factors that should be considered when specifying hydraulic cylinders and how to simplify the process.
To read all of the factors to consider when specifying hydraulic cylinders, download the white paper “The Art of Cylinder Specification”.
Medium-duty hydraulic systems with pressure capabilities of 1000 PSI are used in the majority of industrial applications. Some applications, such as hydraulic presses and automotive manufacturing require heavy-duty systems. Standard heavy-duty hydraulic cylinders can accommodate pressures as high as 3000 PSI. Load capabilities are relative to the full piston area (in square inches) when exposed to fluid pressure multiplied by the gauge pressure in PSI.Stroking distance requirements
Pressure rating can be a concern with custom stroke distances above 10 feet (3.05m). To handle the load, rod diameter must be determined. A pressure rating on load in thrust (push mode) may need to be specified. Rod sag from horizontal applications may result in premature rod bearing wear. To optimize hydraulic system performance, a best practice is comparing the positive effects to any potential negatives.Speed
The definition of “excessive speed” can vary from one design engineer to another. As a good rule of thumb, standard hydraulic cylinder seals can easily handle speeds up to 3.28 feet (1 meter) per second. The tolerance threshold for standard cushions is roughly two thirds (2/3) of that speed. For higher speed applications, a standard low-friction seal is the better choice. But, what you gain in one aspect of performance, you lose in another. The greater the fluid velocity, the higher the fluid temperature, so when opting for speed increasing customizations, it is essential to consider the impact of higher temperatures on the entire hydraulic system. In some hydraulic systems, over-sized ports may eliminate escalated temperature concerns.
Hydraulic cylinder systems using standard components can be designed to meet application temperatures as hot as 500°F (260°C) and as cold as -65°F (-54°C). But temperatures affect both the “hard” and “soft” design components of cylinders. Applications requiring temperature extremes at either or both ends of the temperature spectrum require extensive knowledge of the interdependence of individual components to achieve the best balance of short- and long-term performance expectations. For example, applications near the north or south poles will see a contraction of the seals and metal parts due to the extreme temperatures.Mounting styles
There are basically three categories of mounting styles. Fixed and pivot styles can absorb forces on the cylinder’s centerline and typically include medium-duty and heavy-duty mounts to accommodate thrust or tension. A third category of fixed styles allows the entire cylinder to be supported by the mounting surface below the cylinder centerline, rather than absorbing forces solely along the centerline. Several standardized mounts are available within these categories. OEM design engineers can use these various mount offerings for a wide range of application requirements. NFPA Tie rod cylinders, which are used in the majority of industrial systems, can usually be mounted using a variety of standard mating configurations from trunnion-style heads and caps to extended tie rod cap and/or head end styles, flange style heads, side-lug and side-tapped styles, a range of spherical bearing configurations, and cap fixed clevis designs. Most mounting options are available for both single acting and double rod cylinders.
The goal of every mounting design is to allow the mount to absorb force, stabilize the system and optimize performance. Cap end mounts are recommended for rods loaded primarily in compression (push). A head end mount is recommended for rods loaded in tension (pull). The amount of tension or compression determines the piston rod diameter. The amount of pull or push determines the bore diameter. Other relevant factors to consider when selecting a mounting style include:
Cylinder motion (straight/fixed or pivot)
Every mounting type comes with benefits and limitations. For example, trunnions for pivot-mounted cylinders are incompatible with self-aligning bearings where the small bearing area is positioned at a distance from the trunnions and cylinder heads. Improper use of this type of configuration introduces bending forces that can over-stress the trunnion pins. Many performance expectations that appear to require atypical mounts can be accommodated by existing styles, sometimes with only slight modifications — facilitating replacement and reducing costs.
Bore size is related to operating pressure. The amount of push or pull force required is what determines the bore size needed. Earlier generations of steel and aluminum mill equipment often required the use of non-standard bore and rod sizes. Today, virtually every industrial requirement can be met with NFPA standard and/or ISO-compliant components.
OEM design engineers probably request customization of piston rod sizes more frequently than any other hydraulic cylinder component. What is not always considered is the simple fact that push or pull is never independent of stroke length. Just as a pushed rope holds a straight line only in relation to its length (the longer the rope, the more the rope curls), piston rods under compression or tension tend to diffuse force in non-linear directions. Specifying costly materials such as stainless steel or alloy steels for the rods themselves is unnecessary. In most extreme applications, chrome plating provides a high level of corrosion-resistance required to optimize system longevity.
In conclusion, hydraulic cylinder specification can be a time-consuming and complicated process. Partnering with an engineering manufacturer experienced in hydraulic system design, such as Parker Cylinder Division, early in the design process, an OEM design team can save time and money and ensure reliable system operation and long service life.
Download the white paper “The Art of Cylinder Specification” to read all of the factors to consider when specifying hydraulic cylinders.
This blog was contributed by Jim Hauser, senior engineer, and Rade Knezevic, division sales manager, Parker Cylinder Division.
Not so long ago, only the largest OEMs could afford to develop complex proprietary control systems. But the recent introduction of versatile digital ecosystems connecting electronic control hardware and software to the Cloud is expected to be a game changer for mobile hydraulic machinery and equipment manufacturers.
By empowering design engineers with real-time access to the most sophisticated data collection and monitoring capabilities, such systems are enabling OEMs to customize electro-hydraulic control parameters to meet highly specific application requirements.
This leveling of the playing field is catalyzing a new era of mobile machine and equipment design innovation, as OEMs across industries, tiers and geographies develop customized solutions that digitally integrate their customers’ hydraulic and machine controls with the Internet of Things (IoT). This article will explore some of the major operational and safety advantages of integrated electro-hydraulic motion control platforms connecting mobile machinery and equipment to the IoT.Setting the context for next-generation mobile IoT
Whether customers are managing a fleet of transport trucks, utility vehicles, refuse collection trucks, and material handlers, or complex construction, agricultural and mining machinery, the ability to conduct real-time monitoring of vehicle functions and operator performance enables:
Increased productivity through predictable maintenance and improved uptime
Improved customer satisfaction and loyalty through proactive data-driven service engagement
Improved equipment operator safety, including the ability to field-validate training certifications
Optimized efficiency in energy and fuel usage
The ability to continually track performance variables such as vehicle locations, engine speeds, torque, pressure levels, and aspects of operator behavior
The ability to selectively share data across the distribution and supply channels by assigning multi-tiered user types and permissions
Comprehensive reporting for analysis and improvement
Article contributed by Clint Quanstrom, IoT general manager and Hector Rodriguez, IoT product manager, Motion Systems Group, Parker Hannifin Corporation.
Ray Clapp, owner of Coast Range Construction, Homer, Alaska, was searching for a way to increase efficiency on jobsites. In business for 16 years, Coast Range specializes in setting foundations for lodges and cabins as well as performing house-site development for contractors. Homer has very little flat ground to build on. Terrain ranges from sea level up to 1,400 feet in elevation, and drainage issues are quite common. On many jobsites, it is difficult to maneuver machinery, particularly in tight spaces. Machines often need to be moved several times during a job which can extend the time of a project. Additionally, the challenging terrain is often only accessible by water. Equipment has to be transported by barge. In order to differentiate himself from the competition, Clapp needed a tool that could easily work in tight spaces so that the work could be done cleaner and faster.
Clapp ultimately purchased the PowerTilt tilting coupler and added it to his Hitachi ZX200LC. With PowerTilt’s 180 degree side-to-side tilt and versatility, he can operate his Hitachi with surgical precision cutting all the slopes and angles with just one machine and without having to move it several times during the day.
“The PowerTilt is my secret weapon. It has increased the quality and efficiency of our work to give us the edge over the competition.”
Ray Clapp, owner, Coast Range ConstructionInside Parker Helac’s rotary actuator technology
PowerTilt uses an innovative sliding-spline operating technology to convert linear piston motion into powerful shaft rotation. Each actuator is composed of a housing and two moving parts – the central shaft and piston. As hydraulic pressure is applied, the piston is displaced axially, while the helical gearing on the piston OD and housing’s ring gear cause the simultaneous rotation of the piston. PowerTilt’s end caps, seals and bearings all work in tandem to keep debris and other contaminants out of the inner workings of the actuator, prolonging product life and reducing required maintenance.
The PowerTilt can be used with a variety of attachments. Coast Range mainly uses it for grading projects but some projects have seen the need to attach standard or narrow buckets.
Coast Range used to require three machines for any given project: the Hitachi excavator, a track loader and a small dozer. By adding the PowerTilt to his excavator, projects were completed one to two days faster. The small dozer was only being used an average of 90 hours a year where most machines average about 2,000 hours a year. Clapp estimates a 30 percent increase in productivity with the use of this tool. He also decided to eliminate the small dozer, and now saves one third of the time to complete the same work he used to do with the small dozer. Reduction in equipment decreases transportation costs too.
Purchasing the PowerTilt has given Ray an advantage over the competitors in the area by increasing productivity and creating a clean and more precise finished look on the jobsite. In using this tool for the past 10 years he has had no maintenance issues or downtime.Reliability and durability
The PowerTilt is reliable. The PowerTilt has outlasted Clapp’s machinery. Regular scheduled maintenance and greasing have been key but ten years later, Coast Range’s current PowerTilt has up to 8,000 hours on it and is still going strong with no maintenance issues. Clapp has a lot of confidence that the PowerTilt will always finish the job in any type of weather, terrain or environment in Alaska.
PowerTilt is available for equipment up to 75,000 lbs in eight sizes with standard rotation of up to 180 degrees. Each model is designed for a specific class of machinery and individually customized to fit the carrier.
More product information can be found on PowerTilt here.
This article was contributed by Jessica Howisey, marketing communications manager, Helac Business Unit, Cylinder Division.
Over the last several years, the trend in the oil and gas market has been the near constant decrease in oil prices. As prices continue to drop, companies must find ways to remain profitable by streamlining costs. Design engineers are continually seeking more efficient technologies that can provide the same production capabilities while lowering the cost of operation.Axial piston pumps deliver efficiency
Parker axial piston pumps provide a new-found efficiency. The P1 and PD Series Pumps are a step above the competition because of their energy recovery feature. This feature greatly reduces energy expenditure which saves cost. The pumps are designed to function as a pump to raise the rod string, then as the rod string gravity lowers, the pump is designed to go over center and work as a motor to recover the kinetic energy, which can then be used when raising the rod string or putting the energy back to the grid. In addition, this design allows the pumps to meet duty cycle requirements in applications where competitive products cannot accomplish this.
The P1 and PD series also have exceptional bearing life, which allows it to last longer than competitive product. This reduces down-time and the total cost of ownership. In an industry where down time is extremely costly and operating costs are critical, this feature is invaluable.Axial piston pumps with electronic controls
The P1 and PD medium pressure axial piston pumps utilize electronic control systems to optimize performance with the ability to work with their own ECU or directly with the machine or vehicle’s ECU. The pumps ECU even feature a CANbus interface to support whole-vehicle CANbus systems.
Besides electronic controls, the P1 and PD series offer a broad range of controls, including load sensing capabilities. In oil and gas applications where there can be wide fluctuations in flow and pressure, load sensing controls can save considerable amounts of input power. A load-sensing controlled variable pump eliminates most inefficiencies created by fixed displacement pumps. This reduces the amount of energy lost when the pump is not operating at maximum flow and electronic controls just take that one step further minimizing losses even more than a load sense control.Low Noise Applications
As the public continues to demand a lower dependence on foreign sources of oil, companies are hastily trying to find domestic reserves in commercial quantities. This has forced companies to look for and produce oil and natural gas in locations previously thought to be too close to residential and commercial areas, greatly increasing the need for low-noise equipment due to regulations of operating in such areas.
The unique design of the P1 and PD allow them to excel in low-noise applications. They provide exceptional motor function, while leading the competition in noise reduction. They provide such low noise output that they can be used in a wide array of new low noise applications that have never been tapped due to limitations of other products, while still being cost competitive and highly efficient.
Article contributed by Keith McDonald, product manager, Hydraulic Pump and Power Systems Division, Parker Hannifin Corporation.
The ability to see behind a machine and work area is crucial to improve safety in the operation of heavy equipment and machinery. Just as in automobiles, the capability to see behind a mine haul truck, fork lift, reach stacker or other machinery is important when maneuvering. Additionally, the ability to see the work area including the fork placement on a fork lift, grain conveyor on a harvester or the top hatch on a refuse side loader truck is also important for safety and to help improve operator productivity. Having a camera in place to see if the conveyer is clogged or if the top hatch is blocked can help reduce time, as well as allowing the operator to see potentially dangerous or damaging conditions before they become critical.
More and more heavy equipment, construction machinery, specialty trucks and agriculture equipment are using operator displays in the cab to improve the machine interface. Although dedicated video screens are readily available, having an additional screen for just video, adds cost and can inhibit the operator’s visibility. The ability to integrate video signals onto screens offers a cost-effective solution, as well as improving operator visibility by reducing the number of screens in the cab.
The PHD50 and the PHD70 touch screen displays offer the ability to not only perform the operator interface for engine and machine diagnostics, status and configuration, they also support video input directly to the screens. The PHD50 supports a single video feed, while the PHD70 support two video feeds.
Both PHD models can perform logic and calculations to allow the video screen to show dynamically, based on events or fault conditions. For example, if the loading arms on a refuse truck are raised, but the top hatch is closed, the top hatch video camera feed can automatically appear on the screen to inform the operator of the condition. When a mine haul truck is put into reverse travel, the backup camera feed can automatically appear, or if the chipping wheel on a whole tree chipper signals an overload, the work space camera can automatically appear to show the operator what is causing the overload. This can dramatically improve the machine efficiency by allowing the operator to proactively deal with possible dangerous or work stopping conditions.
In this example, the PHD50_Camera.zip and PHD70 Camera.zip files include an example application program that shows how to implement the single video input into the PHD50 and both video inputs in to the PHD70. In addition to the video input(s), the example has implemented the follow features:
This application example can be used as is for basic video screens or can be modified or included in another PHD application to incorporate the advantages of video screens into an application to accompany engine and machine parameter settings, showing fault codes and overall status and gages. The example contains the graphical content for the video feed selection, the script to invert the video image and the screen to set the backlight intensity using Crank Storyboard and functionality written in Lua script.
To learn more about how PHD displays can help equipment operators, view our product literature, technical specifications and reference materials.
Article contributed by Edward Polzin, regional application engineer - central,
Electronic Controls Division, Parker Hannifin Corporation.
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Most people enjoy theme parks as a place to get away from work, but for those in the hydraulics industry, they are a place to demonstrate their expertise. Behind many of the rides that make your stomach drop or your eyes blink in amazement, Parker's accumulators are picking up the stresses and enhancing the performances of hydraulic technology.
Behind the scenes, there is complex machinery that must run precisely and smoothly to ensure safe and reliable operation. Whether you are splashing through water, sailing above the tree lines, or being wowed by animations and simulations, powerful equipment that depends on the science and engineering of hydraulics is enriching your activities. And, many of these large, powerful hydraulic systems rely on accumulators; hidden from the public view, but critical in their roles.
The role of accumulators
Typically, accumulators installed in hydraulic systems store energy to either provide an extra boost of power or absorb energy to smooth out pulsations. One of the world's largest manufacturer of accumulators is Parker's Accumulator and Cooler Division. According to Jeff Sage, product sales manager, the Parker accumulators used in theme parks are gas-charged and are either bladder accumulators or piston accumulators. Parker manufactures both types and has the engineering expertise to recommend which kind best fits the requirements of a particular ride.
Bladder accumulators are cylinders that contain a rubber bladder (Figure 1). Hydraulic oil is kept under pressure when the bladder is inflated with an inert compressed gas, often nitrogen. When a ride needs a quick burst of power, a valve opens and releases the pressurized hydraulic fluid.
Piston accumulators are metal tubes with an enclosed piston(Figure 2). One side of the piston is charged with a pressurized gas and the other side with hydraulic oil. When the ride requires additional power, the pressurized gas pushes against the piston which forces hydraulic oil back into the ride’s power unit.
Watch it in action:
Accumulators often play valuable roles in hydraulic systems that power rides for a variety of reasons. As you can imagine, moving multi-ton cars, coasters, and props, often times with rapid acceleration in minimal time, requires extreme bursts of force. Delivering this concentrated force is taxing on hydraulics systems and can cause jerky movements. Accumulators work to absorb these extreme pressures and movements, store energy and keep performance consistent – delivering the extra “push” when a hydraulics system needs it.
Often there are many accumulators used on each ride. For example, on motion-simulator rides, which have become quite popular since the 1980s, many accumulators are used. These are amazing rides where people feel all the shakes, rattles and rolls depicted in a movie shown on a large screen. A big surge of energy is needed to move the platform. Within these rides there are 24 platforms, each with banks of 10-gallon bladder accumulators. Each time the platform moves, a quick burst of energy is needed. These accumulators provide the high acceleration needed to make the ride exciting and memorable.
Safety, of course, must be at the forefront of manufacturing accumulators. A ride that breaks down can cause injuries or worse. Most bladder accumulator failures come from the bladder failing. Parker accumulators minimize the issue by manufacturing its own bladders for quality control reasons. This is not common and differentiates Parker from the competition.
Knowing how important the chemical process is in the making of these bladders, the company has its own chemist, buys the rubber and mixes the bladder compounds. With everything controlled and created in-house, this helps Parker produce accumulator bladders that are of the highest quality and reliability.
And when a piston accumulator fails it is typically a result of a leak in the rubber seal located on the outer cylinder of the piston. A proper functioning seal separates the gas from the oil. Gas molecules are very small and can penetrate through the rubber seal. Parker applies its expertise in rubber composition to develop seals that minimize the gas permeation, thus extending the life of the piston accumulator.
More on reliability
Nothing stops the fun at a theme park like a sign at a ride’s entrance that says, “OUT OF ORDER.”
Carlos Aguirre, a Sales and Systems engineer at Bernell Hydraulics Inc., uses Parker because of their accumulator expertise, reliability, and service. Bernell and Aguirre have a long history of working with the nation’s top theme parks and using Parker's accumulators to keep the attractions running smoothly and safely. Aguirre and his teams work overnight after theme parks close, so it’s essential that he chooses trusted vendor partners that can deliver dependable parts when they are needed. While most of Aguirre’s theme park projects have used bladder accumulators, new projects are requiring piston accumulators.
“Park patrons want to enjoy their favorite rides. I need quality parts delivered on time so we can get the work done at night and have the ride ready to roll when the gates open in the morning. I like the expertise Parker offers on either type. One call and I get the information I need to make theme parks fun and safe for all.”
Carlos Aguirre, sales and systems engineer at Bernell Hydraulics Inc.
The next time you’re at a theme park waiting to ride, we hope that the greatest energy is the energy of the moment. However, you might take a moment to appreciate the extreme amounts of force and energy required for your favorite ride to give you a hair-raising experience. For our accumulators, handling the exciting extremes is a walk in the park.
If you would like more information about accumulators, visit Parker Accumulator and Cooler Division.
Article contributed by Jeff Sage, product sales manager, Parker Hannifin Accumulator and Cooler Division.
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Control of vehicle speed is important to equipment operators. The ability to accurately set the speed of a conveyor or roller in applications such as road paving or striping, crop sprayers and sugar cane harvesters is essential to help optimize productivity and help reduce waste. Additionally, the ability to enter a user ID, PIN or password is often a requirement to help ensure only authorized users have access to operate heavy equipment. Although large, more complex displays can perform these basic functions, they are often not cost effective or small enough to be a good application fit.A cost-effective, dynamic solution
The PHD28 touch screen display offers a cost-effective replacement for a traditional, robust keypad in a dynamically configurable platform. In addition, the PHD28 has enough built in processing power to perform basic calculations, check entry limits of values entered, rescale values or even change the value based on an incoming CAN message or input signal. With its compact, 2.8-inch size, it fits well in many consoles and dashboards without compromising valuable space.
Using the PHD28 in conjunction with other Parker electronic products where a simple to use number entry system can control complicated systems.Numerical entry to control vehicle speed
When control of conveyor speed is needed to perform the functions of the vehicle, a PHD along with an IQAN controller can provide this functionality as a low cost and efficient solution.
For example, the PHD28 programmed as a numeric keypad will allow the operator to select the desired conveyor speed and then transmit that value to an IQAN MC43 controller to control the vehicle. This instance can be expanded to any of the PHD family displays as well as the IQAN family of controllers.
In this example, a value is entered by the user and if within range, the target speed is transmitted over the CAN bus to the IQAN controller. To confirm the value, the feedback from the IQAN controller is shown in the top right of the screen and is used to control the vehicle speed.
The IQAN controller can then communicate with the diesel engine and brake control system to regulate vehicle speed. When vehicle speed does not match the input value from the keypad, the IQAN controller can notify the engine to speed up if the vehicle is moving too slow. If the vehicle is moving too fast, the IQAN controller can activate the brake system so the vehicle will slow down.
Vehicle speed can be measured using a sensor such as a Parker GS60 speed sensor. The frequency output from the GS60 can be connected to the IQAN controller, which would use a PID loop to control the engine and braking system to maintain the desired speed.
If an operator must adjust vehicle speed, they can enter the appropriate speed value or use the up and down arrows to adjust the current value.
Parker offers the keypad program for the PHD eliminating the need for programming in this specific configuration. An IQAN 5 external function and example application is also supplied to make it easy to integrate with the rest of the IQAN application. If a custom design or look is desired, the PHD28 can be programmed to fit that application using Crank Storyboard software.
In the example to the right, the screen shows a numerical keypad where the user can enter a numerical value with 0.1 precision. The user enters the value and then has the option to select cancel, revert to the previous value, or enter to accept the value. Upon acceptance, the value is then transmitted to the system controller via a J1939 message. The user also has the option to increment and decrement the current value using the up and down arrows.
This example is configured so that the system controller can send an acceptable maximum value as a variable to the PHD to qualify the input value is within range. Then the PHD gives a color coded visual indication to the user the value was accepted.In the example above, the screen shows a numerical keypad where the user can enter a numerical value with 0.1 precision. The user enters the value and then has the option to select cancel, revert to the previous value, or enter to accept the value. Upon acceptance, the value is then transmitted to the system controller via a J1939 message. The user also has the option to increment and decrement the current value using the up and down arrows.
The transmitted J1939 message in this example uses PGN 0xFF00 with two parameters: the entered value and a Boolean search that is active while the OK button is pressed. The resulting J1939 message in the example also uses PGN 0xFF00 with two parameters: the maximum acceptable value and a feedback value so the system controller can acknowledge that entered value was accepted.
This application example can be used as is for a basic keypad device, can be modified to accommodate desired form and function or can be used in an existing PHD application to add keypad functionality. The example contains the graphical content, screen layout using Crank Storyboard and functionality written in Lua script.
In many cases, the content of the keypad should be adjusted for regional content, customer color theme or operating mode. These dynamic changes cannot be accomplished on a traditional mechanical keypad.Products and features:
Easily enter and change values in system
PHD program and IQAN function group available
GS60 Speed Sensor
Robust, outdoor rated products
To learn more about PHD Displays, view our product literature, technical specifications and reference materials.
Article contributed by Edward Polzin, regional application engineer - central, Electronic Controls Division, Parker Hannifin Corporation
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