Control
Showing 19–27 of 29 results
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Electronics, Control System and InstrumentationPCI Interface Design Trainer
The PCI application is now widely used and has replaced the ISA system. PC-based interfacing and I/O experimentation had been based on the ISA (Industry Standard Architecture) bus, however, the PCI (Peripheral Component Interconnect) bus, makes it much more difficult for users to interface their own circuits directly to the PC. The PCIDT rectifies this situation enabling the experiments to be carried out via the PCI bus.
The PCIDT provides a solution for teaching PC-based interfacing to various I/O devices on modern PCs using the PCI bus. Pre-written experiments cover I/O devices from switches and 7-segment displays and A/D and D/A conversion to the optional DC and stepper motors. A complete introduction to PC interfacing covering PC interfaces and how to connect a range of common I/O devices is provides along with twelve experiments, with their program listings in assembly language and C, based on the PCIDT’s pre-wired circuits. Using the exercises in the textbooks and tools, users are able to learn quickly in controlling I/O under Windows through a PCI interface card. Users can develop and learn PCI I/O control, in addition experiments with C or VB language. The system contains two main units: the interface card and the experiment platform. The design ensures that none of the experiments require soldering. The unit is enclosed in a strong and durable case.
Key Features
- Designed for quick and easy learning
- I/O control in Windows/DOS through PCI Interfacing
- Examples in assembly language and C
- PCI bus interface card and cable provided
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Electronics, Control System and InstrumentationPendulum Control System
The Pendulum Control System, PCS2, is designed for the study of control engineering and theory. The PCS2 consists of a carriage module and analogue control module with a mimic of the system. It can function as a stand-alone analogue system or be interfaced to an external controller such as a PC using a suitable interface card. The PCS2 is supplied with an interface card and PCSDS software. The software includes attempted Linear control, attempted Harmonic control, and Direct Digital Control and Fuzzy Logic control. Students can compare the performance of the different controllers. Connection is through 4mm-shrouded colour coded sockets and to an interface card through the IDC connection.
The PCS2 can be used in two different modes, an inverted pendulum or an overhead crane, each mode presents a control situation that requires a separate approach and solution and an understanding of how feedback systems function. The first mode; control of an inherently unstable system, to balance the pendulum in the inverted position the pivot must be continuously moved to correct the falling pendulum. In the second mode; the carriage module is turned upside down to act as a crane, the pendulum swings into an equilibrium position with the centre of mass below the pivot, control the Linear position of the load, with very oscillatory dynamics.
Experiments:
- Static and dynamic characteristics of the pendulum control system
- Analogue control of an inverted pendulum
- Fuzzy Logic control of the inverted pendulum
- Direct Digital controller design and implementation: inverted pendulum
- Direct Digital controller design and implementation: swinging crane
Key Features
- Control of inherently unstable systems and of systems with very oscillatory dynamics
- Study of control engineering theory
- Stand-alone Analogue control
- Classic control model for Analogue, Direct Digital or Fuzzy Logic control
- Two different modes, an inverted pendulum or overhead crane
- Software with attempted Linear control, attempted Harmonic control, Direct Digital control and Fuzzy Logic control
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Electronics, Control System and InstrumentationPower Electronics Lab
The Power Electronics Lab is used to perform power electronics circuit experiments. Student studying the characteristics of power electronics devices and the applications of power devices will find this an essential piece of equipment. The applications of power devices are in alarm circuit, lamp flasher, rectifiers, choppers, inverters and also commutation circuits.
Experiments:
- The characteristics of SCR
- The characteristics of UJT
- The characteristics of MOSFET
- The characteristics of IGBT
- The characteristics of DIAC
- The characteristics of TRIAC
- The characteristics of PUT
- The class B commutation circuit
- The class C commutation circuit
- The class D commutation circuit
- The class F commutation circuit
- Resistor triggering circuit
- Resistor-Capacitor triggering circuit (half-wave)
- Resistor-Capacitor triggering circuit (full-wave)
- The SCR triggered by UJT
- The SCR triggered by 555IC
- The SCR triggered by Op-Amp 741IC
- Ramp and pedestal triggering circuit using anti-parallel SCR in AC load
- The UJT relaxation oscillator
- The voltage commutated chopper
- The Bedford inverter
- The single phase PWM inverter using MOSFET and IGBT
- The half-wave controlled rectifier with resistive load
- The full wave controlled rectifier (mid-point) with resistive load
- The fully controlled bridge rectifier with load
Key Features
- Functional blocks indicated with on board mimic
- Pulse generator with frequency and duty cycle control
- Single phase rectifier firing circuit with firing angle control
- Pulse amplifier and isolation transformer
- Breadboard for circuit experimentation
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Electronics, Control System and InstrumentationSorter Unit
The Sorter Unit (SRU) is designed to be used as a control application from PC or microcontroller. The SRU includes the use of opto-electronic sensors for counting and sorting and control of linear solenoid actuators.
The SR is a two dimensional bead sorting and counting system that has two distinct functions. It is a three-layer sandwich construction, which encapsulates fifty white beads, and fifty black beads, which are free to move around a pattern of hoppers with tracks cut into the middle layer.
Bead Pattern Creation: The unit has two hoppers to store two different coloured beads. Two linear electrical solenoids are used to open and close gates at the outlets of the hoppers. If either solenoid is briefly de-energised, a bead of the appropriate colour is released from the hopper and rolls down the zigzag track that has a number of possible bead patterns in the track. Feedback from an infrared through-beam sensor is used to ascertain if a bead has been successfully dispensed each time.
Bead Sorting: When both hoppers are empty and the required bead pattern has been achieved the unit may be turned upside down to allow the beads to be sorted back into their respective hoppers. A second pair of solenoids are used to deflect each coloured bead into a hopper and an infrared reflective sensor is used to determine the colour of each bead.
The sensor’s output sends a binary signal to the computer to signify black or white depending upon how much of the infrared beam is reflected from the bead. An audible indicator on the SRU is used to indicate ‘end of sequence’ or that an error has occurred.
A PC fitted with a suitable internal interface card can be used to connect to the SRU through the IDC header and Programing software used to write a control programs for the Unit. A microprocessor can also be used for control.
Experiments:
- Producing a program for control of the sorter unit
- The bead sensor
- The buzzer
- A program to generate a bead sequence
- A program to sort the beads out
Key Features
- Sorts and counts components
- Uses opto-electronic devices
- Control of linear actuators
- Bead pattern creation
- Bead sorting
- Clear front give a visual understanding of the operation
- Quick and easy set-up
- Control from PC or Microcontroller
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Electronics, Control System and InstrumentationStepper Motor Training System
The Stepper Motor Training System (SMTS) is a self-contained unit that connects to a PC through USB. The SMTS is designed to teach the principles and operations of stepper motors and can be used as an application for programming, providing experience into the many applications of stepping motors.
Stepping motors, are motors which rotate one step when supplied with a pulse. Typical applications include CNC machine tool drives, X-Y plotters and Printers. The control signals required are almost always the same, regardless of motor size.
The system comprises of four Stepper Motors and includes an interactive software program. The software introduces the principles of stepper motors, their use and control. The software includes questions and answers to allow the teacher to evaluate the knowledge of the students.
Key Features
- Introduction to Stepper Motor control
- Manual and automated control
- Self-contained unit
- Tutorial software
- Question and answers for each section of the tutorial software
- Clockwise and anti-clockwise direction
- Can be used as a target application for programming software
- Easily interfaced to PC through USB
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Electronics, Control System and InstrumentationTouch Screen Oscilloscope
The touch screen oscilloscopes are innovative, slim with a compact, multi-touch screen making these units a practical and versatile choice. The built in battery and storage space allows for easy portability.
Key Features
- New Unique Design
- Multi-touch high resolution 10.1″ display
- Bandwidth ranges: 100/150/200MHz
- Built in 4GB storage
- Tap, Pinch, Stretch or Slide screen touch functions
- Li-ion Battery for up to 7 working hours for easy portability
- 31 Auto Measurements
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Electronics, Control System and InstrumentationTraffic Control Unit
The Traffic Control Unit (TCU) can be used as an application for control from either PLC or PC. For PLC control a PLC with six digital inputs and eleven digital outputs is required to control all features on the unit. For PC control a USB is fitted, allowing control from either the supplied software or programing software compatible with the USB interface.
The TCU represents a typical crossroads junction controlled by two pairs of traffic lights together with a pedestrian crossing on one approach. The TCU features a clear mimic of a traffic junction with the lights and pedestrian crossings represented by LED’s in the appropriate colours. Four buttons are used to simulate vehicle sensors built into the surface of the road and represent traffic flow. Further buttons are used to control the pedestrian crossing and a reset signal.
The Acrylic front cover protects the electronics and the mimic from damage. The TCU is supplied with a manual that includes a user guide, courseware suggestions and solutions to the exercises.
USB or IDC connection supplied as required.
Experiments:
- Basic traffic light sequence
- Dual traffic light sequence
- Traffic counting
- Time alteration according to traffic flow
- Pedestrian crossing (stand alone)
- Complete system control
- Adjusted pedestrian priority
Key Features
- Self-contained easy to setup
- Control from PLC or PC
- Connect to PLC through 24v dc ‘D’ type connectors and 4mm coloured sockets
- PC connection through USB
- Acrylic front with clear visual mimic of a crossroad junction, reversed printed to protect from damage
- Familiar environment for easy understanding of programming requirement
- Electronics and LEDs are secured within the enclosure preventing damage
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Electronics, Control System and InstrumentationTransducer Trainer
The TRT is a collection of four transducer trainers which include Optical, Temperature, Strain gauge and LVDT. The four different trainers help teach students an introduction into various elements of transducers. The strain gauge trainer uses a cantilever beam arrangement to produce strain on the strain gauge with weights placed on the free end of the cantilever. The seven-segment LED display shows strain in micro strain units. Different weights are provided to perform linearity and sensitivity experiments.
The Optical Transducer comprises of various sensors and transducers which provides the basic knowledge for sensing light and signal conditioning of the signals received from the sensors and transducers. The Temperature Transducer trainer covers four different types of transducers. Experiments covering fundamental characteristics of transducers and the study of transducer controlled switching/alarm systems can be performed.
The LVDT (Linear Variable Differential Transformer) is the most widely used inductive transducer for displacement measurement. LVDT is a secondary transducer which converts the displacement directly into an electrical output proportional to the displacement. The trainers seven-segment LED display shows displacement in mm with a sensitivity of 10mV/mm in the range of 10mm.
Experiments:
Optical Transducer Experiments
- Characteristics of Filament Lamp
- Characteristics of Photovoltaic Cell
- Characteristics of Photoconductive Cell
- Characteristics of PIN Photodiode
- Characteristics of Phototransistor
- Optically Controlled Switching System
Temperature Transducer Experiments
- Characteristics of IC Temperature Sensor
- Characteristics of Platinum RTD
- Characteristics of NTC Thermistor
- Characteristics of NTC Bridge Circuit
- Characteristics of K type Thermocouple
- Temperature controlled Alarm System (1 NTC)
- Temperature controlled Alarm System (2 NTC)
LVDT Transducer Experiments
- Study of Input Output Characteristics of LVDT
- Determination of Linear Range of Operation of LVDT
- Determination of Sensitivity of LVDT
- Measurement of Phase Difference between LVDT Secondary Winding
Strain Gauge Experiments
- Study of Strain Measurement using Strain Gauges and Cantilever Assembly
- Determination of Linear Range of operation of Strain Measurement
- Determination Sensitivity of Trainer
Key Features
- Four different optical Transducers
- Study of Transducer controlled switching
- Functional blocks indicated by on-board mimics
- Four different temperature Transducers
- Study of Transducer controlled switching/alarm systems
- On-board signal conditioning circuitry
- Sensitive, Linear, Stable and Accurate
- 3½ digit LED display with polarity indicator
- LVDT displacement measurement jig with micrometer
- On-board excitation generator
- Amplitude adjustment for excitation generator
- Test points to observe inputs and outputs
- Onboard gain adjustment
- Offset null adjustment
- 3½ digits LED display
- On-board cantilever arrangement
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Electronics, Control System and InstrumentationTwin Rotor Mimo System
The Twin Rotor MIMO System (TRMS) behaviour resembles that of a helicopter. From the control point of view it illustrates a high order nonlinear system with significant cross-couplings. A mathematical model design of TRMS needs knowledge of aero dynamical physical laws. The TRMS system has been designed to operate with a PC-based digital controller that communicates with the position, speed sensors and motors by a dedicated I/O. The I/O board is controlled by the real-time software which operates in the MATLAB / Simulink RTW/RTWT environment.
The TRMS consists of a beam pivoted on its base so that it can rotate freely both in the horizontal and vertical planes. At both ends of the beam there are rotors driven by DC motors. A counterbalance arm with a weight at its end is fixed to the beam at the pivot. The state of the beam is described by four process variables: horizontal and vertical angles measured by encoders fitted at the pivot, and two corresponding angular velocities.
Two additional state variables are the angular velocities of the rotors, measured by speed sensors coupled with the driving DC motors. In a real helicopter the aerodynamic force is controlled by changing the angle of attack. In the TRMS the angle of attack is fixed. The aerodynamic force is controlled by varying the speed of rotors. Significant cross-couplings are observed between actions of the rotors. Each rotor influences both position angles. A design of stabilising controllers for TRMS is based on decoupling.
Key Features
- MIMO system for real-time experiments
- Integration with MATLAB and Simulink for real-time controller generation
- The software enables rapid prototyping of real time control algorithms:
- Method of rapid prototyping of user-defined controllers
- Library of basic controllers and getting started teaching manual
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