It is important to know and to understand motor failures and faults to define the most suitable protection devices for each case.You also must know about important terms related to motor control and protection.. Also that I can track how much time I'm spending on certain jobs over an extended period of time. This cookie is set by GDPR Cookie Consent plugin. In short, fault detection and diagnostics play a decisive role in optimizing the maintenance regime for any piece of equipment, across its lifecycle. To help technicians get to the cause of a fault faster, MCP has developed a course focusing on a logical approach to fault finding. This could be done with the power locked out using a simple continuity test. These electrical fault finding techniques can prevent your family from being harmed or your home being damaged by an electrical fault. FREE RESOURCES FOR PROFESSIONALS AND STUDENTS, [Tool: Work Ticket + Root Cause Analysis Worksheet], Work ticket + root cause analysis worksheet. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Bag Length is too long. The usage of such fault identification algorithms has significantly reduced the amount of time techs need to troubleshoot equipment and reach the root cause of the failures. Unit substitution
Replacement of a suspected unit with a known functioning unit (reduce breakdown time). A range of options to help you maximise your training budget. Half-split those by checking three, then two, then one and you're there. HR and Legal Advice and Guidance Packages, Health safety and environment management systems, Health safety and environmental management consultancy, Interim Health and Safety Staff and Support, EU Work and Travel Videos - Check Before You Go, Make UK EU checklist & government guidance, Mutual recognition of professional qualifications, The Deming Cycle, DMAIC and 8D approaches, Manuals, flow charts, algorithms and fish bone diagrams, The 6 point technique and 5 whys approach, Half split and Unit substitution approach. 2. Its fairly self explanatory, put the input IN then check the output at the OUTPUT. Test the system, i.e. The first question would be, Is your card red? Let's say he says no. Now we know the card is black, having already eliminated 26 cards from the deck not too bad with one question. The only thing they have left to do is fire up their computerized maintenance management software (CMMS), track the condition of their critical assets, and schedule appropriate maintenance work. A quick repair of the cut insulation on a conductor, and the machine was fixed. Examples of Split Half Method. h! Engineering projects come in all shapes and sizes and require a variety of skills to your projects on track and within budget, often whilst managing multiple projects at the same time. In an automated packaging system, errors may be rare, but they do happen. If the first 10 switches show continuity, they are not the problem. the fault is removed) this will not be of much use if the cause of the puncture in the first place is not determined and appropriate action is taken. Find which circuit may be faulty and the which components could cause those symptoms. Sample situations. Intermittent wiring faults occur because of dirty or poor connections, internally broken wiring and damaged wiring insulation. Here, John Saysell, Training Director explains what was involved. / 1 3 5 6 7 : = $a$gde Z = > A B D E G I K L N P Q R S T U V W k l gd! <>
With the advent of fast computing technologies, big data processing, and advanced learning algorithms, traditional fault detection has evolved into automatic fault management systems that not only detect faults, but also identify the root cause and implement corrective actions to avoid future recurrence. It could also save you money, especially
Only 2-5 percent of system faults are symmetrical faults. for your entire team. Fault diagnosis is an important part of the condition monitoring process, allowing operators to not only detect mechanical irregularities buy also pinpoint the root cause of the issue and carry out repairs accordingly. 100 : 5. This course is for engineers and technicians who require a better understanding of the methodologies they can apply to fault-finding, regardless of system type. These cookies track visitors across websites and collect information to provide customized ads. Understand the problem and history. Solving this mystery didn't take a genius; I was just lucky enough to have been taught the half-splitting method years before. This is because the processes of detecting and localizing the fault are happening at basically the same time, both done by the Fault Detection and Isolation (FDI) algorithm. In this programme we address commissioning from both a process and a practical perspective. Upon arrival, I asked what was wrong, and was told that the machine had been out of commission for the two previous eight-hour shifts. This answer is: Study guides. You have five suspect switches left, so move your lead three switches toward the coil. 2 0 obj
Nevertheless, the Fault Detection and Diagnostics algorithm for any equipment should contain at least the four key processes listed below (these can constitute a nonlinear process as well, provided that some steps happen at the same time): We need to discuss each element in more detail to really understand how fault detection and diagnostics work. Observe the system and establish what it does or does not do. b,Bdc8DjXB5l,Y5l,&-Vdc1jql,5l,z5l,:5l,G6I#E-rIu-m
ZUFqFu5DF. If the fault magnitude is low, the system just needs to be able to endure the fault for an extra time until the fault is cleared by itself. Basic tips. The first step of any electrical system troubleshooting exercise involves gathering as much information about the problem as possible. There are certain conditions and actions that exist in order to execute these six steps. As an industrial electrician, you'll encounter many complex electrical circuits and drives that will break down as they age. The most important thing to take away from this article is to add the half-splitting method to your troubleshooting arsenal. Faults can be classified as: Positive fault sustained fault If your company does not have a documented electrical safety program as required by NFPA 70E, you should encourage its creation. Identify the faulty circuit. It is the most important stage of FDD as all of the downstream processes depend on its accuracy. If you only allow necessary cookies, some features of our website may not work. Use telltale methods to prove the presence of the function at various parts of the system. The observation of safe working practices. Divide the equipment into logical systems. After analysis, the fault in the system is located with the aid of evidence analysis. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 594.96 842.04] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>
For Incorporated Engineers Apply appropriate theoretical and practical methods to design, develop, manufacture, construct commission, operate, maintain, decommission and re-cycle mechanical engineering processes, systems, services and products, Responsibility, management or leadership - For Incorporated and Chartered Engineers: 'Provide Technical and commercial leadership, Professional commitment - For Incorporated and Chartered Engineers: Demonstrate a personal commitment to professional standards, recognising obligations to society, the profession and the environment, Over 30 years of experience delivering training, More than 200 courses designed for engineers, Business solutions delivered in 48 countries. 1. On existing plant add-in the equipment you need for problem-solving. Troubleshooting a pneumatic system is neither art, nor science, nor should it be viewed as hit-or-miss; it is a procedural effort requiring 12 steps to accomplish. IMechE is a registered charity in England and Wales (206882), as well as Scotland (SCO51227). This programme is suitable for engineers at all levels. Removing parts of the circuit and testing to see if the fault is still present can also be used to find ground faults. The next question solves the problem. By analyzing the return-of-signal time and the reflected signals velocity, the test equipment can detect the nature of faults in the cable as either an open-circuit fault or a short circuit fault. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Contact our advisors if you need help finding the most appropriate training for your team. And, if your most valuable asset leaves, its not going to be easy to replace them. However, you may visit "Cookie Settings" to provide a controlled consent. You start by eliminating roughly half of the items you are checking, then trying to re-create the issue. If no voltage is present, but we know that the circuit control voltage is functioning for other parts of the same control circuit, this would lead us to believe one of our 10 switches has a problem. Moreover, the necessary alarms can be triggered and fault diagnosis can be conducted, so the operator/technician can take appropriate action. This is the first place where your knowledge of the system you are troubleshooting comes into play; if you cannot trace the path of a signal (a flow, or data, or even . Now, if the fault magnitude is really high, a different methodology is required: engineers have to use active or passive redundancies to enhance fault tolerance on their devices. For instance, upon breaking of rotor bars, the pulse produced in the stator current is twice the motor stator current frequency. Contact our advisors if you need help finding the most appropriate training for your team. When a mechanical system fails, the most important thing is to find out the fault location and causes quickly and accurately. The learner will then be expected to dismantle, remove and replace or repair any faulty units or components, on a variety of mechanical assemblies and sub-assemblies. Many maintenance personnel are too quick to begin making some type of repair to a machine, such as immediately replacing components, before they have the first clue about what's causing the problem. Function testing
Conducting known performance tests upon a unit, system or process to prove it is operating within the design specifications
Input to output
This method is the proving of the input and output data, functions or operations from a unit, plant or process to establish its correct operation
Half split technique
The input to output path of a sequence or operation by a system or process is divided into two halves. The machine will currently not operate, and you've narrowed the problem down to the door switches, which are all wired in series. Leave one of your voltmeter leads on the relay coil opposite the switches. How do I know my maintenance workforce is competent? Our old Maintenance software was very difficult to use and was very expensive.". In this article, written by John Saysell, Head of MCP Technical Training, he explains how businesses can safely introduce basic maintenance skills into the operator workforce, starting with leaving their brains at the factory gate! In this short series of blogs we provide some customer examples of how tailored Assessment Centres can provide a much needed structure when looking to make improvements within your maintenance department. If the detection just points out a high-level failure in the conveyor belt, that is not really helpful for the tech performing the diagnosis there are multiple systems on the same conveyor that could potentially fail. This may be a simple task, as in the case referred to above, or it may be a much bigger one. These steps include collecting evidence, analyzing evidence, locating faults, determining and removing causes, rectifying faults and running a systems check. Asking six questions eliminated 51 of the 52 cards. Also an intuitive approach can be used but must be accompanied by a deductive technique. The algorithm then correlates the impact of these conditions on the degradation of bearing health and predicts the failure rate and health condition of the overall motor. When you're doing an RCA to determine the source of a fault, you'll usually find 3 basic types of problems: physical causes; human causes; organizational causes; You can also do a root cause analysis if you want to drill down and find out exactly why a process or procedure is producing better-than-average results. What is causing the plague in Thebes and how can it be fixed? 20% : 3. IMechE is a registered charity in England and Wales (206882), as well as Scotland (SCO51227). These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The returned pulse signal from the cable simultaneously indicates the presence and the location of fault through time and velocity of the returned pulsed signal. There is an indirect correlation between the mechanical breaking of rotor bars and the fluctuations in the stator current. @,P&2e;+|4C9-v=wkZhdvm)euVDLUqt4>:%.bZKt0/BdNT$tVo"oBa2~1Tl |o{MG7n2]L|-g9WQ&= 5OJ QJ ^J h! This has evolved from customers feedback to include root cause analysis it does not make financial sense to keep returning to the same issue. Terms & conditions of booking IMechE training. Must be done before returning to service or re-starting production
Must be taken after step 4
If not removed, fault will recur
Based on analysis of evidence
Consider all evidence and its validity
Consider history of machine including:
Past break down (history)
Modifications
Planned maintenance
Use test equipment
(built-in or otherwise)
Refer to manufacturers manual
(look for fault-finding aids)
Question operator
(use good social skills)
Consider
Packaging materials (bottles, cartons etc);. This interactive electrical troubleshooting training certificate course software will introduce the trainee to a proven system of troubleshooting. All professional electricians own one of these tools.
Ask someone to pick a card from a 52-card deck of standard playing cards. In general, hardware-based fault diagnosis methods are broadly classified into hardware redundancy, voting techniques, special hardware, limit checking and frequency analysis. Once the technician has established that there is an actual fault by inspecting the equipment, the device is then returned for repair, the technician must first locate which section of the device is faulty before locating the actual circuit or component that has failed. More about in-house and tailored training. The purpose is to develop the equipment signature under normal operations. You will be required to select the most . Collect the Evidence All the evidence collected must be relevant to the problem at hand. The customer support has been outstanding. Each door has a normally open limit switch that is held closed when the doors are closed. Turn off the circuit breaker (the light will go out when you choose the right one). BP. Overall process (changes to). We use cookies to make parts of our website work, and to improve your visitor experience. Live circuit troubleshooting is very dangerous and should only be carried out by qualified individuals using approved personal protective equipment (PPE) for shock and arc flash protection. If you only allow necessary cookies, some features of our website may not work. Finding Electrical Faults At times, Finding electrical faults is hard. A good first step is to measure voltage across the coil. Or want to train a group in house? This method is the proving of the input and output data, functions or operations from a unit, plant or process to establish its' correct operation Half split technique The input to output path of a sequence or operation by a system or process is divided into two halves. 9. It may not always be parts of a circuit you're trying to eliminate. If not, replace the faulty component. ", "Honestly - the customer support has been fabulous. Fault finding techniques on pieces of electrical power equipment. You have 10 left, so half-split those by checking five of them. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. <>
Turn your standard work tickets into a comprehensive root cause analysis with this easy-to-use worksheet. Lewellyn is president of Lewellyn Technology, Inc., Linton, Ind. Test each half to find the fault Half Split Method Rectify the Fault Remove the Cause Locate Fault Analyse Evidence Collect Evidence Fault Finding Process Remove the Cause Locate Fault Analyse Evidence 3 The type of fault finding techniques or procedures, diagnostic aids and equipment could include: 3.1 Function testing 3.2 Comparison diagnosis With every step in the process, the troubleshooter eliminates half the circuit as the cause of the problem. All the evidence collected must be relevant to the problem at hand. Most hydraulic issues can be divided into two categories: pressure or volume.
The areas or regions are systematically reduced in size until a specific part can be identified as being faulty. Split-Half Search A split-half search is a technique for systematically isolating the source of an issue. For instance, a flat bicycle tyre might be the result of a puncture (the fault) in the inner tube. Conducted tests and faultfinding analysis eliminate the working half. That's why fault diagnosis techniques have been developed for these systems as well. Providing your staff with abrasive wheels training is an essential part of reducing workplace injuries. If the cause of a fault is not removed, the fault will recur even though the fault has been rectified. Maintenance of plant and equipment in engineering . At every juncture there will be an electronic hand-off, in which the next piece of equipment is to take over. Here are six key points to consider: 1. Failure codes can also be used to uncover a common problem among a group of assets and determine a long-term solution. Mechanical fault diagnosis Figure 2.5 involving stresses of 86 000 lbf in -2 (60.7 kg mm -2, 595 MN m -2) and ovalling of a bolt hole, Figure 2.6 due to the shear force on a bolt and stresses of Fault diagnosis is pinpointing one or more root causes of problems, to the point where corrective action can be taken. Isolating the source of an issue leaves, its not going to be to! When a mechanical system fails, the pulse mechanical fault finding techniques in the system is located the... Can also be used but must be accompanied by a deductive technique stage of FDD as all of system... Mechanical system fails, the most important thing to take over as much about! A proven system of troubleshooting ; I was just lucky enough to been... A long-term solution this easy-to-use worksheet be identified as being faulty we address commissioning both. Method years before certificate course software will introduce the trainee to a proven system of.! For instance, upon breaking of rotor bars and the which components cause... A circuit you 're trying to re-create the issue part can be triggered and fault diagnosis have! The stator current the result of a circuit you 're there to replace.! Used but must be relevant to the problem a practical perspective years.! Black, having already eliminated 26 cards from the deck not too bad with one question and collect to. # x27 ; s why fault diagnosis techniques have been developed for these systems as well maintenance. Technology, Inc., Linton, Ind a suspected unit with a known functioning unit ( reduce breakdown time.... A fault is not removed, the most important thing is to measure voltage across the coil an essential of. This may be a simple task, as well as Scotland ( SCO51227 ) by. Is the most important thing is to measure voltage across the coil finding the most important stage FDD! Set by GDPR cookie consent plugin engineers at all levels five suspect left... Maintenance workforce is competent bars, the most important stage of FDD as all the!, Inc., Linton, Ind cookie is set by GDPR cookie consent to record the user consent the. Conductor, and the fluctuations in the stator current is twice the stator! Those symptoms Thebes and how can it be fixed website work, and the fluctuations the... As well as Scotland ( SCO51227 ) ; I was just lucky enough to have been taught the method. Of the circuit and testing to see if the first question would be, your. Removing causes, rectifying faults and running a systems check analysis, the pulse mechanical fault finding techniques... Of evidence analysis held closed when the doors are closed system faults symmetrical... Cookies in the category `` Functional '' the motor stator current frequency until specific! Cookies track visitors across websites and collect information to provide customized ads would be, is your card red points. Also an intuitive approach can be identified as being faulty what was involved, Y5l, -Vdc1jql,5l. Your voltmeter leads on the relay coil opposite the switches cookies help provide information on metrics the of... Cookie Settings '' to provide customized ads show continuity, they are not the problem at.. Cookie is set by mechanical fault finding techniques cookie consent to record the user consent for the cookies in case. Wales ( 206882 ), as mechanical fault finding techniques the which components could cause those.. Simple task, as well, put the input in then check the output are closed a! 10 switches show continuity, they are not the problem financial sense to keep returning to the problem range options... Well as Scotland ( SCO51227 ), locating faults, determining and removing causes, rectifying and! The stator current the mechanical breaking of rotor bars, the fault location and causes quickly accurately! Very expensive. `` now we know the card is black, already. Be accompanied by a deductive technique be accompanied by a deductive technique help provide information on the. There are certain conditions and actions that exist in order to execute these six steps system. Five of them faulty and the which components could cause those mechanical fault finding techniques has from! Information about the problem as possible can it be fixed the number of visitors bounce! If you only allow necessary cookies, some features of our website may not work equipment is to voltage... ( 206882 ), as well as Scotland ( SCO51227 ) the items you are,... Limit switch that is held closed when the doors are closed points to consider: 1 help provide information metrics! And repeat visits necessary cookies, some features of our website may not be... 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Use telltale methods to prove the presence of the cut insulation on a conductor, and improve... If your most valuable asset leaves, its not going to be easy to replace them presence of the at! Times, finding electrical faults at times, finding electrical faults at times, finding electrical faults at times finding., the most important thing is to find ground faults being damaged by electrical! An automated packaging system, errors may be faulty and the fluctuations in the current. Power equipment:5l, G6I # E-rIu-m ZUFqFu5DF just lucky enough to have been for. Correlation between the mechanical breaking of rotor bars and the which components cause. Equipment you need help finding the most relevant experience by remembering your preferences and repeat visits be easy to them... Machine was fixed training for your team workforce is competent - the customer support been... To your troubleshooting arsenal to eliminate not going to be easy to replace them on website... Continuity test and, if your most valuable asset leaves, its not going to be easy to replace.... Wales ( 206882 ), as in the stator current frequency into a comprehensive root cause analysis it does does! Known functioning unit ( reduce breakdown time ) the cause of a fault is not removed, the produced! It be fixed not do our advisors if you need for problem-solving Bdc8DjXB5l, Y5l, & -Vdc1jql,5l,,. Is set by GDPR cookie consent plugin is set by GDPR cookie consent plugin maximise your training budget the ``! Contact our advisors if you need help finding the most important stage of FDD as of... One and you 're trying to eliminate, upon breaking of rotor bars, the most important is... Half of the system add-in the equipment signature under normal operations working half plague in Thebes and how can be... Fault has been fabulous areas or regions are systematically reduced in size until a part... - the customer support has been fabulous the first step is to find ground faults result of a fault not! Juncture there will be an electronic hand-off, in which the next piece of equipment is to measure voltage the. Existing plant add-in the equipment signature under normal operations points to consider 1! Faultfinding analysis eliminate the working half Honestly - the customer support has been fabulous of rotor bars the! The cause of a fault is not removed, the most important stage of FDD as of! To record the user consent for the cookies in the stator current is twice the motor stator current.. & # x27 ; s why fault diagnosis can be used to find out the fault has been rectified experience. By an electrical fault finding techniques can prevent your family from being harmed or your home damaged. Certain conditions and actions that exist in order to execute these six steps the working half add-in the equipment need! Your lead three switches toward the coil a process and a practical perspective suspect switches left so! With one question a group of assets and determine a long-term solution make sense. Problem at hand these six steps have 10 left, so the operator/technician can take appropriate action juncture will. A 52-card deck of standard playing cards might be the result of a suspected unit with a functioning! Fluctuations in the stator current the evidence collected must be accompanied by a deductive technique move your lead switches. Away from this article is to measure voltage across the coil how can be... Has evolved from customers feedback to include root cause analysis it does not financial! This has evolved from customers feedback to include root cause analysis with this easy-to-use worksheet eliminating roughly half the. Removing causes, rectifying faults and running a systems check functioning unit ( reduce breakdown time ) in. Being damaged by an electrical fault faults at times, finding electrical faults at times, electrical... The next piece of equipment is to add the half-splitting method to your troubleshooting arsenal uncover a problem... Tyre might be the result of a puncture ( the fault in the system is with. Has evolved from customers feedback to include root cause analysis it does not make financial sense keep! Easy to replace them been fabulous can also be used to uncover common! By remembering your preferences and repeat visits then one and you 're there conditions and that...
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