Premium Essay

Work Relay

In:

Submitted By jasapir
Words 3513
Pages 15
DRAFT Problem#5: Overlapping project starts Starting more work does not equate to finishing more work. Figure 1: Putting more work into play will NOT accelerate progress
It seems like common sense: the more work is dumped in the hopper, the more work gets done. But when the number of resources remains static, increasing volume of WIP merely increases confusion, increases conflict – and decrases real productivity. While everyone looks busy, the true picture often remains obscure until deadlines approach, when the failure to complete projects becomes all too visible.
Failure to establish an effective mechanism to limit WUP remains a major cause of delays and even failures for many projects. Most project managers assume that an early finish requires an early start (or to finish on time, start as soon as possible). As a result, project teams get pushed to start work as soon as they receive the green light, regardless of resource availability and timeline. In practice, however, this assumption never works out. Starting early results in overloading resources, confusion about work priorities, and hence an inefficient work environment. This constant overload results in frustration. In the long run, overloading will result in increased staff turnover as personnel “burn out” in the struggle to stay on top of complex and ever-changing workloads. This overloading of the system is the primary driver of the most inefficient practice in project management: the project review meetings. What are those meetings, but little more that “resorting” of the work in the system?
Projects get started before the organization is ready
In an effort to take advantage of valuable new opportunities, multi-project organizations, more often than not, tend to launch projects as soon as they are understood, concurrently with existing projects, simultaneously with other new efforts,

Similar Documents

Free Essay

Management

...PROJECT REPORT ON FUZZY CONTROLLER BASED DIFFERENTIAL PROTECTION SCHEME FOR POWER TRANSFORMER iii CONTENTS Page no. * ACKNOWLEDGEMENT (i) * CERTIFICATE (ii) * CONTENTS (iii) * ABSTRACT (iv) CHAPTER 1: 1.1 INTRODUCTION. 1.2 MOTIVATION FOR UNDERTAKING THE PROJECT. 1.3 AIMS AND OBJECTIVES OF THE PROJECT. CHAPTER 2: REVIEW OF LITERATURE. CHAPTER 3: IMPLEMENTATION OF THE PROJECT. CHAPTER 4: DATA COLLECTION AND ANALYSIS OF THE RESULT. CHAPTER 5: 5.1 DISCUSSION OF THE RESULT AND CONCLUSION. 5.2 DISCUSSION OF THE RESULT AND CONCLUSION. REFERENC iv ABSTRACT The power transformer is an essential component of electrical power system that needs continuous monitoring...

Words: 2833 - Pages: 12

Free Essay

A Document in Need

...Zelio Logic 2 Smart Relay User Manual SR2MAN01 11/2007 Table of Contents Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 About the Book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Part I Initial Power up and Discovering . . . . . . . . . . . . . . . . . . 11 Chapter 1 Initial Power up and Discovering . . . . . . . . . . . . . . . . . . . . . . . 13 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Presentation of the Smart Relay Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . Characteristics and Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Control Keys on the Front Panel of the Smart Relay . . . . . . . . . . . . . . . . . . . . . Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 17 19 20 23 Part II Functions Accessible from the Front Panel . . . . . . . . . 29 Chapter 2 Chapter 3 Chapter 4 Overview of the Functions Accessible from the Front Panel. . . . 31 Functions Accessible from the Front Panel of the Smart Relay . . . . . . . . . . . . . 31 Input/Output Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Inputs-Outputs Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 TEXT and DISPLAY screen . . . . ....

Words: 15155 - Pages: 61

Free Essay

E-Book Plc Programming

...Programmable Logic Controllers: Programming Methods and Applications by John R. Hackworth and Frederick D. Hackworth, Jr. Table of Contents Chapter 1 - Ladder Diagram Fundamentals Chapter 2 - The Programmable Logic Controller Chapter 3 - Fundamental PLC Programming Chapter 4 - Advanced Programming Techniques Chapter 5 - Mnemonic Programming Code Chapter 6 - Wiring Techniques Chapter 7 - Analog I/O Chapter 8 - Discrete Position Sensors Chapter 9 - Encoders, Transducers, and Advanced Sensors Chapter 10 - Closed Loop and PID Control Chapter 11 - Motor Controls Chapter 12 - System Integrity and Safety Preface Most textbooks related to programmable controllers start with the basics of ladder logic, Boolean algebra, contacts, coils and all the other aspects of learning to program PLCs. However, once they get more deeply into the subject, they generally narrow the field of view to one particular manufacturer's unit (usually one of the more popular brands and models), and concentrate on programming that device with it's capabilities and peculiarities. This is worthwhile if the desire is to learn to program that unit. However, after finishing the PLC course, the student will most likely be employed in a position designing, programming, and maintaining systems using PLCs of another brand or model, or even more likely, many machines with many different brands and models of PLC. It seems to the authors that it would be more advantageous to approach the...

Words: 73061 - Pages: 293

Free Essay

Gjgjgj

...POSITIONING OF BOTTLES Metal Parts Sensors SENSORS Work to be dipped Sensor VALVE POSITION CONTROL POSITION SENSOR FOR GALVANISING PLANT DRILL BREAK SENSOR PART COUNTER INDUCTIVE PROXIMITY SWITCH - SERIES IPS Flush Mounting: Fixing of switches in the metal up to their sensing face. Non-Flush Mounting: These switches are to be mounted keeping metal free zone around its sensing face. SENSING DISTANCE Sensing Distance of inductive Proximity Switch depends on, Size of the Proximity Switch/ Sensing Face and Material to be sensed. OBJECT The sensing distance specified here is for object made of mild steel, having thickness of 1 mm. Size of the object should be at least equal to the diameter of switch / sensing face. For object other than M.S. apply suitable correction factor CORRECTION FACTOR : Apply following correction factor (%) when object is other than Mild Steel. MS 100 SALIENT FEATURES : 1) 2) 3) 4) 5) 6) Repeat Accuracy Hysteresis Grade of Protection Enclosure LED Indication Ambient temp : : : : : : 0.02 mm 3-10% IP 67. For block type: IP 55 Metallic (Nickel-Chrome plated brass) / stainless steel / plastic. Provided. 70 0C max. 4 CAST IRON 110 ALUMINIUM 45 COPPER 40 SS 85 BRASS 50 3d d d FLUSH NON FLUSH INDUCTIVE THREE WIRE & FOUR WIRE DC SWITCHES : SERIES : IPS D3 These are three /four wire Switches (+ ve, -ve and output) working on 10-40 V DC. and directly drives DC Relay. These switches are compatible with PLC modules...

Words: 3570 - Pages: 15

Premium Essay

Relays

...What are relays? Before, I talk about any particular relay – I think it is very important to clarify what exactly relays are? As per my understanding, relay is basically a type of electromechanical switch It has electromagnet and several other components in it. Relays works on electromagnetic principles. How relays work (theory) A relay basically has two parts (circuits). One part (circuit) is the actual switch, which basically acts as a control of the current to electromagnetic and the relay itself is controlled by electromagnet. A relay is basically an incomplete circuit when it is turned off. It has arm which we call "armature" which completes the circuit if and only if the electromagnet is present (electromagnet is produced if we allow the current using the first circuit thus creating an electromagnetic..). So, if we turn on the first part of the circuit which allows the current to flow and consequently, electromagnet is produced in the circuit which produces a magnetic field around it - This electromagnet attracts the armature coil towards itself thus completing the circuit. Thus, the circuit is now completed and current flows through the entire circuit. Of course, if we want to simply stop the circuit at any time, we can simply switch off the first part of the circuit which means no current in the first part of the circuit and as such the electromagnet is no longer magnetic and thus the armature coil goes back to its initial position and circuit is now again...

Words: 769 - Pages: 4

Premium Essay

Kilgogre

...Kilgore Manufacturing Case Report | | | Kilgore Manufacturing, Inc Case Background – Kilgore Manufacturing, Inc.: Kilgore Manufacturing, Inc. is a small manufacturing company based out of St. Louis area that is looking to expand their business. They operate within the aerospace industries that are currently bidding on new contracts related to the strategic defense initiative. Currently, they are betting against three different companies for a contract to produce R-7 relay switches. Whoever has the highest bid while producing over the limit amount of switches will win the bid. If awarded the contract a quota of 600 switches must be met each day, if not a $5000 penalty will be accessed. The companies’ usual profit margin is $3.80 per relay switch. KMI’s goal is to determine whether they should implement the new or the old R-7 production process. Additionally, what is the minimum daily production level needed to produce a profit $1000 per day. Analysis: Recently, based on a suggestion from a plant worker Kilgore manufacturing changed their production process. The original method produced an average of 635 units with a standard deviation of 40. Their lowest production in a day was 494 and highest was 768. They did a 60 day trial run using the new method to determine if indeed it was a more efficient process. See Figure 1 below with the daily results of the 60 day trial: New Method Figure 1 As predicted the new method did start off slow due to the steep learning...

Words: 733 - Pages: 3

Free Essay

Jayrodil

...Electrical Symbols and Line Diagrams Chapter 3 Material taken from Chapter 3 of Electric Motor Controls, G. Rockis, 2001 One-Line Diagrams One-line diagram – a diagram that uses single lines and graphic symbols to indicate the path and components of an electrical circuit. One-line diagrams are used when information about a circuit is required but detail of the actual wire connections and operation of the circuit are not. 1 Line Diagrams A line (ladder) diagram is a diagram that shows the logic of an electrical circuit or system using standard symbols. A line diagram is used to show the relationship between circuits and their components but not the actual location of the components. Line diagrams provide a fast, easy understanding of the connections and use of components. Electric Motor Controls, G. Rockis, 2001 2 Electric Motor Controls, G. Rockis, 2001 Wiring Diagrams Wiring (connection) diagram – a diagram that shows the connection of an installation or its component devices or parts. Wiring diagrams show, as closely as possible, the actual location of each component in a circuit, including the control circuit and the power circuit. 3 Electric Motor Controls, G. Rockis, 2001 Manual Control Circuits Manual control circuit – any circuit that requires a person to initiate an action for the circuit to operate. A line diagram may be used to illustrate a manual control circuit of a pushbutton controlling a pilot light. A line diagram may be...

Words: 2121 - Pages: 9

Free Essay

Electronics and Communicatio

...received and the signal is decoded and given to the Microcontroller, which uses this information for displaying the alert message in the LCD as programmed, simultaneously a buzzer alert is given. Block Diagram Transmitter[pic] Receiver [pic] HARDWARE REQUIREMENTS • Microcontroller Unit and Power Supply • LCD • Alarm unit • RF transmitter and receiver SOFTWARE REQUIREMENTS • Embedded C • Keil Compiler LIST OF HARDWARE MODULES: MODULE 1: Power Supply for 8051 Microcontroller MODULE 2: Encoder MODULE 3: RF Transmitter MODULE 4: Decoder MODULE 5: RF Receiver MODULE 6: Relay...

Words: 1216 - Pages: 5

Free Essay

Plaza

...Therefore, the piece has to be maintained in perpetuity since it is officially considered part of American and North Carolinian culture. It’s very instance, there are computers to maintain and upgrade, software to be written, and components to replace and possibly design. There are many ways to improve the whole system like, the sonic gates could more sync with the steps. They could use weight sensors on the steps which would allow the Arduino to sync with music system. This would allow the weight of person to activate the music system instead of person crossing the sonic gates. Water Wall functions on the solenoid contracting and release mechanism. Usually solenoids tend to get worn out .One way to improve is by changing the mechanism they work, using opto-isolator circuit. This will help eliminate noise and safe some voltage when solenoid contracts. Each of these operations uses a different form of technology, as the glockenspiel uses a MDI sensor. MDI is a port on a hub or switch used to connect to other switches without requiring crossover cables. The other type of software is the Arduino sensor, which is an open-source computer hardware company that design and manufactures kits for building digital devices and interactive objects that can sense and control the physical world. DMI and Arduino are both sensors but DMI is programmed based on timing of the day, whereas Arduino software is based on the environment around it, as the ground cloud and water wall use the program. Having...

Words: 372 - Pages: 2

Free Essay

Definition

...* DISPENSER * IR LEDS * SENSOR * INDICATOR * LAVATORIES * PHOTOTRANSISTOR * INFRARED * GALLIUM * ARSENIDE * PHOTORESISTOR(LDR) * RELAY * TELEGRAPH CIRCUIT * PROTECTIVE RELAY * IC BURNER DISPENSER One that dispenses or gives out, especially a machine or container that allows the contents to be removed and used in convenient or prescribed amounts. IR LEDS An IR LED, also known as IR transmitter, is a special purpose LED that transmits infrared rays in the range of 760 nm wavelength. Such LEDs are usually made of gallium arsenide or aluminium gallium arsenide. They, along with IR receivers, are commonly used as sensors. The appearance is same as a common LED. Since the human eye cannot see the infrared radiations, it is not possible for a person to identify whether the IR LED is working or not, unlike a common LED. To overcome this problem, the camera on a cellphone can be used. The camera can show us the IR rays being emanated from the IR LED in a circuit. SENSOR A sensor (also called detector) is a converter that measures a physical quantity and converts it into a signal which can be read by an observer or by an (today mostly electronic) instrument. For example, a mercury-in-glass thermometer converts the measured temperature into expansion and contraction of a liquid which can be read on a calibrated glass tube. A thermocouple converts temperature to an output voltage which can be read by a voltmeter. For accuracy...

Words: 1380 - Pages: 6

Free Essay

Electri Sequence

...SEQUENCE OF ELECTIRCAL OPERATION SEQUENCE OF ELECTIRCAL OPERATION The electrical sequence between a freezer and a cooler are wired almost the same except for a freezer has a defrost heater, defrost thermostat, and clock motor to be able to turn the compressor, evaporator and condenser fan motors off when the clock motor is in a defrost duration. When the clock motor clicks it stops sending power to the components I just listed above and then sends power through the thermostat and then to the defrost heater. Keep in mind every load as in the compressor and fan motors need a neutral. The reason we need a clock motor is to simply thaw the ice on the evaporator coil. When the evaporator coil thaws it creates water that drips onto the drain pan down the drain line. The drain line needs to have heat tape on it so the water in the line doesn’t freeze and eventually plug. And the reason the freezer will form ice as to where a cooler might just have some minor frost is because the temperature of the evaporator coil is lower than 32 degrees. So that is what’s different from the wiring to a cooler and a freezer. Now when the unit is plugged in and the thermostat is not calling for cooling, only the neutral from the plug will be powered to all of your loads. And the hot wire that comes from your plug to the clock motor is your switched hot, meaning when the thermostat rises on a rise in temperature it then sends power to the compressor and condenser fan. One thing that is the same between...

Words: 574 - Pages: 3

Free Essay

Assadsadsad

...Power System Fault and Protection Page 1 Power System Fault Protection    Per Unit Fault Protection Page 2 Per Unit  Problem   Computation for a power system having 2 or more voltage levels become cumbersome Need to convert currents to a different voltage level wherever they flow through a transformer Page 3 Per Unit  Solution   A set of base values is assumed for each voltage class All values express in per unit (i.e. no dimension) Page 4 Per Unit  To completely define a per unit system, minimum 4 base quantities are required     Voltage Current Impedance Power Page 5 Per Unit  General  Per Unit= Actual / Base Vpu=Vactual / Vbase Ipu=Iactual / Ibase Zpu=Zactual / Zbase Spu=Sactual / Sbase Sbase= Vbase Ibase Vbase= Ibase Zbase Page 6  Specific       Example Page 7 Example Page 8 Example Page 9 Example Page 10 Example Page 11 Example Page 12 Example Page 13 Example Page 14 Example Page 15 Fault    Cause of Fault Effect of Fault Fault Level Page 16 Causes of Faults  Transient over voltages  the failure of insulation, resulting in fault current or short-circuit current.   Insulation aging External object   tree branches bird Page 17 Effect of Fault  Equipment be damaged due to overheating or insulation breakdown       Generator Transformer Busbar Cable...

Words: 883 - Pages: 4

Free Essay

Starters

...switched on to the mains, the armature will draw a heavy current (Ia = V/Ra) because of small armature resistance. As an example, 5 H.P., 220 V shunt motor has a full-load current of 20 A and an armature resistance of about 0.5 . If this motor is directly switched on to supply, it would take an armature current of 220/0.5 = 440 A which is 22 times the full-load current. This high starting current may result in: (i) burning of armature due to excessive heating effect, (ii) damaging the commutator and brushes due to heavy sparking, (iii) excessive voltage drop in the line to which the motor is connected. The result is that the operation of other appliances connected to the line may be impaired and in particular cases, they may refuse to work. In order to avoid excessive current at starting, a variable resistance (known as starting resistance) is inserted in series with the armature circuit. This resistance is gradually reduced as the motor gains speed (and hence Eb increases) and eventually it is cut out completely when the motor has attained full speed. The value of starting resistance is generally such that starting current is limited to 1.25 to 2 times the full-load current. 5.8 Types of D.C. Motor Starters The stalling operation of a d.c. motor consists in the insertion of external resistance into the armature circuit to limit the starting current taken by the motor and the removal of this resistance in steps as the motor accelerates. When the motor attains the...

Words: 1109 - Pages: 5

Free Essay

Blue Spider

...large currents will flow, and the fuse link will melt, causing the circuit to open(when concerned economics. 6.what is dominant type of abnormal condition in power system. Short circuit. 7.What protective equipment are share among adjacent protective zones in power system Circuit breaker. 8.Is two level protection economically justifiable for any type of failure No, just for short circuit 9Distinguish between “a” and “b” relay contact .a for an open contact ;b for an closed contact 10. Define “pickup” value of relay actuating quantity When a relay operates to open a b contact or to close an a contact, we say that it "picks up 11 Define”reset” value of relay actuating quantity When a relay operates to close a b contact, or to move to a stop in place of a b contact, we say that it "resets 12 what is the role of “seal in”or “holding” coil in a relay? Briefly explain with a diagram In order to protect the contacts against damage resulting from a possible inadvertent attempt to interrupt the flow of the circuit tripcoil current, some relays are provided with a holding mechanism comprising a small...

Words: 573 - Pages: 3

Free Essay

Attendance and Room Automation

...part of the system; this will be the one that gathers the input to be processed delivers the output and will run the actuating device. Last would be the machine programming, provided by the proponents for the whole system to run. Theoretical Framework Each of the devices is supported by different theories which we hope we would be able to integrate. A microcontroller “is a small computer on a single IC containing a processor core, memory, and a programmable Input/Output peripheral.” (http://en.wikipedia.org/wiki/Microcontroller) We will be using this device as the brain of the system. We will be using the memory of the IC to encode the program and the I/O system inside the IC to retrieve data through RFID and other communication interface. Relays switches are switches which are electronically controlled. “There are only two fundamentally different operating principles: (1) electromagnetic attraction, and (2) electromagnetic induction. “(www.gedigitalenergy.com/multilin/notes/artsci/art02.pdf ). Wireless communication is a...

Words: 636 - Pages: 3