Engineering, Polytechnic and Vocational Training Equipment-> Control Engineering Trainers

[1] 2 [ Next»]   Click to Enlarge PID CONTROL TRAINER MODEL IBL-1 The PID Control Trainer, Model PID-1 is a stand-alone instrument, consisting of, a Microprocessor as a controller. PID control allows changing the Proportional, Integral, Derivative bands. Simulated output having different inertia in the form of time constant elements are available as simulated loads. A simulated load with RC combination is used to create load conditions. The values of R and C can be changed, by a selector switch to change to different time constants of the simulated load. This load replaces actual instrument or transducer, which is supposed to act as load with variable time response system, for the controller. A Disturbance Generator (reset mechanism) is used to instantaneously change the state of process variable. Adjustable damping control is provided to change the rate-of decay of process variable. The state of change of controlling Set Point (SP) which is the input to the controller and monitoring controlled Process Variable (PV) outputs can be observed, on two independent input and output terminals respectively. An external recorder when connected to the output terminals, the recorder draws the input/output response for a step change. An optional external dual trace 15Mhz oscilloscope is used to display the controlling and controlled output waveforms. By using an optional external XY recorder, the waveforms can also be printed. The following PID waveform can be observed at the output terminals of the controller using an optional Oscilloscope, or hardcopy of this can be obtained on a recorder. Specifications: Microprocessor MPT-85 Based. Simulated RC Load: 1set. Disturbance Simulator Switch: 1 No. Damping control using a Potentiometer: 1No. Provision to measure controlling input and controlled output, on different terminals. Voltmeter monitors either the process variable or control variable by switch selection. See Enlarge Click to Enlarge PID CONTROL TRAINER MODEL IBL-1 The PID Control Trainer, Model PID-1 is a stand-alone instrument, consisting of, a Microprocessor as a controller. PID control allows changing the Proportional, Integral, Derivative bands. Simulated output having different inertia in the form of time constant elements are available as simulated loads. A simulated load with RC combination is used to create load conditions. The values of R and C can be changed, by a selector switch to change to different time constants of the simulated load. This load replaces actual instrument or transducer, which is supposed to act as load with variable time response system, for the controller. A Disturbance Generator (reset mechanism) is used to instantaneously change the state of process variable. Adjustable damping control is provided to change the rate-of decay of process variable. The state of change of controlling Set Point (SP) which is the input to the controller and monitoring controlled Process Variable (PV) outputs can be observed, on two independent input and output terminals respectively. An external recorder when connected to the output terminals, the recorder draws the input/output response for a step change. An optional external dual trace 15Mhz oscilloscope is used to display the controlling and controlled output waveforms. By using an optional external XY recorder, the waveforms can also be printed. The following PID waveform can be observed at the output terminals of the controller using an optional Oscilloscope, or hardcopy of this can be obtained on a recorder. Specifications: Microprocessor MPT-85 Based. Simulated RC Load: 1set. Disturbance Simulator Switch: 1 No. Damping control using a Potentiometer: 1No. Provision to measure controlling input and controlled output, on different terminals. Voltmeter monitors either the process variable or control variable by switch selection. See Enlarge Click to Enlarge PID CONTROL TRAINER MODEL IBL- 2 This Trainer is IBM PC based instrument. The software is WINDOWS based. The PID software requires to be SETUP before commencement of the experiment. This trainer has all the facilities to set PID parameters, change the process dynamics, connect external process instruments at its 4-20mA Tx and Rx terminals and observe their status on meters. Create process disturbances using step input. Change the rate of disturbance using built in simulator. It is possible to view the Process Variable (PV), Control Variable (CV) and Set Point (SP) status on line all the time. It is possible to Zoom a section of the logged data (graph) and make, timing analysis of the process dynamics etc. This has facility to take printouts of either complete responses or a section of the response (zoomed) on normal Dot matrix printer or Laser printer. This can store the acquired responses of a particular experiment on a file for post analysis. Time markers can be set to study the process dynamics to study the behavior of controller. PID control allows changing the Proportional, Integral, and Derivative Bands. Simulated output having different inertia load using a variable time constant can be simulated. By this method process dynamics can be changed. Disturbance generator provides STEP change to the process dynamics which instantaneously changes the state of output. Adjustable damping control is provided to change the rate-of decay of output. The state of change of controlling input and controlled outputs can be observed, on two analog meters. One 4-20mA current transmitter and a number of 4-20mA receiver are provided for logging and controlling. Process parameters like, acquiring the status of an external control valve and sending current signal to an external transmitter, any other process, I to P converter or control equipment. The input / output responses can be recorded using an external recorder. This instrument requires an IBM PC with atleast one ISA slot on the motherboard for inserting dedicated ADD-ON card. The following Screen can be seen on the computer?s screen in response to running PID program. It is possible to print the response of the PID control functions on your printer for record purpose. Upon saving this logged trend it is possible to make post analysis of the above controller. The following icons, represent various features available as post analysis options. Specifications: Simulated RC load : 1set Disturbance Simulator Switch for STEP input: 1 No Damping control using Potentiometer: 1No Switch selectable 4 to 20 mA current receiver terminal, when in external mode Provision to measure controlling input and controlled output, on different terminals Switch selectable 4 to 20mA Analog Meter: 1 No Analog Voltmeter: 1 No Built-in power supply Interface cable set. Note: Computer is not supplied with this trainer. Dedicated interface card will be provided for connecting to optional IBM or compatible computer. See Enlarge Click to Enlarge PID CONTROL TRAINER MODEL IBL-3 This is a standalone PID Control Trainer. In this trainer, the PID functions are derived from discrete electronics. This trainer has the following blocks to accomplish PID experiment derived from discrete functional blocks. The functional block diagram explains the fundamental blocks required in a 3-TERM controller. They are Input Block: Input block contains a potentiometer to vary the set point (SP), which can be varied in the range of from 0-5V DC. Comparator Block: Set point and the feedback from the process is compared here. The output from the comparator is the difference between set point and feedback from the process. It is possible to give the comparator output as input to either one or all the PID blocks. It is recommended to study the nature of process variable (PV) output for each of the following blocks. Later the benefit of connecting PI, and PID can be independently be studied. This approach will be beneficial to appreciate the reason why PI or PID controller is much preferred than using only P or I or D controller. The following process blocks are provided. They are Proportional Block: Error signal from the comparator output can be connected as an input to the proportional block. Output from proportional block is proportional to the error signal. The proportional gain can be set in the range of 0 to 100% in 10-decade steps. Integral Block: Error signal from the comparator output can be connected as an input to the Integral block. Output from this block is the sum of all error signal in a time domain. The integral gain can be set in the range of 0 to 100% in 10-decade steps. Derivative Block: In order to connect the derivative block the output from the comparator should be given to the derivative block input Summing Amplifier Block: Summing Amplifier is used to add the output from all controller blocks. Process Block: Here the process is simulated using Lead / Lag Network. Reset Function: Reset Function or Disturbance in the process is simulated by the user by a dedicated momentary switch. The final process variable can be observed on an oscilloscope at the output terminals. This can also be recorded using an external recorder for documentation purposes. See Enlarge Click to Enlarge PID CONTROL TRAINER. (PC BASED) MODEL IBL-PID-DAS1 This is a 3-term control trainer. By connecting this unit to Computer Applications Trainer Model DAS-1, complete PID control actions can be studied. The software has facility to set the process parameters namely, set-point (SP), Process variable (PV), Control variable (CV). It is possible to set the Proportional (P), Integral (I), and Derivative (D), bands in the range of 0 to 100% and PID control can be accomplished. This unit has necessary hardware to change time constants of process dynamics under study. It is possible to change or create disturbance in the process, while the PID action is in progress. There is an additional facility to introduce disturbance in rate of change of process dynamics also, thereby simulating actual conditions of process dynamics. It is possible to observe the instantaneous values on-line of PV and CV status by using a DMM or a recorder or an Oscilloscope. This PID trainer is an accessory to Computer Applications trainer Model DAS-1. This unit makes use of hardware of DAS-1 like ADC, DAC, current TX and RX as part of PID actions. Specifications: Time contestants : Independent R and C settings used Disturbance : Step change is possible using momentary switch. Rate disturbance : A continuously variable potentiometer is used Observation post : Possible to monitor PV and CV Note: This requires Computer Applications trainer Model DAS-1 See Enlarge Click to Enlarge SINGLE SET-POINT CONTROL TRAINER. MODEL IBL-1 This trainer can be set to one preset temperature at which relay turns ON/OFF. In short this instrument is Single input, Single setting, Single relay (230V AC @ 3A) output, 0? C to 400? C FSD instrument. The internal 3 1/2-digit display is used for displaying preset values and actual temperature. See Enlarge Click to Enlarge DUAL SET-POINT CONTROL TRAINER. MODEL IBL-2 This is a BANG-BANG Controller. This trainer can be preset to two different temperatures for control action. One setting for lower temperature action which activates first really (230V AC @ 3A). The second preset for upper level temperature control actions, which activates the second, relay (12V DC). The internal 3 1/2 digit display used for displaying preset values and actual temperature. In short this instrument is: Single input, dual setting, dual output. Specifications: Input : J, K, RTD (PT-100) Output : Relay(s), 230V AC @ 3A, and resistive loads Control action : ON/OFF Transducers : Any one of the above. Display : 3 1/2-digit display. Open sensor : In open sensor condition "1" is displayed. Power : 230V AC (Mains) operated. See Enlarge Click to Enlarge BLIND TEMPERATURE CONTROL TRAINER. MODEL IBL-3 This trainer is an analog controller. The ON/OFF action is set by a potentiometer, with a dial, which is graduated from 0? C to 450? C. The accuracy is ?10? C of set point. See Enlarge Click to Enlarge LVDT FEEDBACK POSITION CONTROL TRAINER. MODEL IM-35 This is a 2nd order control system. LVDT forms part of input transducer, and stepper motor becomes the actuating element. In this trainer, simple ON-OFF control is implemented when used with Microprocessor trainer Model MPT-85. In order to allow the control action, the set point of final position of LVDT displacement forms an Input element to the controller. The controller determines how fast the desired position should reach. In order to facilitate the above objectives, an external Microprocessor trainer Model MPT-85 will act a controller. The student learns how to write a control algorithm to meet the above objective. Specifications: LVDT : ? 10mm LVDT Signal conditioner: Sine generator, instrumentation amplifier, and buffer amplifier. Display: On-board, 3-? digit displacement indicator ADC: 8 ?BIT compatible with MPT-85 Stepper Motor: 2 Kg/cm2 with necessary power drivers. Built-in Power Supply Transducer assembly: The entire LVDT and the Stepper Motor is located in an ergonomically styled cabinet. Connections: using 15 Pin D-Type connector. Note: This trainer requires an external Microprocessor Trainer Model MPT-85. See Enlarge Click to Enlarge RLC NETWORK TRAINER. MODEL AN?5 RLC Network Trainer has many functions. RLC Network is used to study the response of an incoming frequency when passed through an RLC Network. RLC Network contributes towards change in amplitude and phase. By using this technique several communications, industrial, commercial circuits are developed. Using this trainer, it is possible to study 1st order and 2nd order control experiments. It is recommended to use a storage oscilloscope for measurement of rise and fall times of output for a given input frequency, especially for Step input. Alternately, When PID control trainer Model PID-2 is used along with this trainer,, the responses can be captured and used for analysis at a later point of time. PID-2 software permits for analysis for post applications for slow varying inputs. Since Lissajous figures fall in the scope of frequency measurement, this trainer has all the necessary materials to perform the measurement of frequencies. An oscilloscope is an important requirement to observe such a pattern. This trainer can also be used to study the resonance circuits also, namely Parallel Resonance, and Series Resonance Circuits. This trainer has the following facilities: In built Sine Wave Generator (having provision to change the frequency in multiples of 1KHz to 10KHz and also to change the amplitude of the waveform) Assorted value of Resistors (1KW, 10KW, 22KW, 100KW). PN Junction Diodes (1N4001). Assorted value of Capacitors (0.01mfd, 0.047mfd, 0.1mfd, 0.47mfd). Variable Inductance Ranges from (0-10) mH. Variable Potentiometers (1KW, 10KW). Instrumentation Amplifier. See Enlarge Click to Enlarge STUDY OF LEAD AND LAG NETWORK MODEL IBL-1 Theory: In most of the feedback control engineering systems, the speed of achieving stable response for a given input (set point) is the criteria for proper control. Often in any control system, the actuating elements namely motors, tacho-generators etc are all inherently inertial system with finite damping, the system response for stability can be achieved by adding compensating network, so that they react faster to achieve stability than without these compensators. The most important part of the feedback loop for the designer is the loop filter. It is basically a low-pass filter with a corner frequency that should be well below the signal frequencies, so that the control voltage to the system is relatively steady. However, the system must be able to respond to changes, so the corner frequency should be above the frequency of those changes. Quite often, we want a system that responds rather slowly, to provide a flywheel action that damps out noise and unwanted variations. It is a delicate matter of compromise, and the designer's tool is the loop filter. Therefore there exists a need to understand what these LEAD-LAG Network is all about. The simplest and really, satisfactory loop filter is the so-called lead-lag filter. It is an RC low-pass filter with an extra resistance in series with the capacitor. The pole provides a phase lead, while the zero a phase lag, so that the phase is zero both at low and high frequencies. It is easy to draw a Bode plot of the phase variation, as well as of the gain. One method of loop filter design is to determine satisfactory values for fc and f2, and then to proportion the filter reasonably. The resistors can be larger if the capacitor is smaller, and vice-versa. About LEAD-LAG Network trainer: In this LEAD-LAG network trainer, it is possible to study the following transfer functions, with the help of an external function generator and dual beam Oscilloscope. 1. for Lead- Lag transfer function 1 +sT2 / 1+a T1 2. for a Integrator and Lead transfer function of 1 +sT2 / sT1 3. for a Integrator and Lead with phase compensator transfer function of (1 / sT1) (1 +sT2 / 1 +sT3) By proper adjustment of the input signal source, it is possible to observe the corner frequencies. In order to accomplish the above, the trainer has all the necessary components, Op-Amp, built-in power supplies. Interconnections between the devices are by using patch cords. At the end it is necessary to draw the Bode plot for analysis. An external function generator operating in the range of 100Hz to 10KHz is required as signal source. A dual beam oscilloscope is required to observe the input output waveforms. At low frequencies, it is necessary to have a storage oscilloscope to record slow varying input signals. Optional: When this Study of Lead and Lag Network Model LLN-1 is connected to PID trainer Model PID-2 and Speed Control of DC Motor using Chopper Drives Model PE-10, it forms an excellent full fledge laboratory tool. Because PID-2 is a PC based system, with plenty of post analysis capability. In this way one can observe the real physical system, responding to the actual plant situations. See Enlarge Click to Enlarge SIMULATION OF STANDARD TEST SIGNALS. MODEL IBL-1 Simulation of standard signals plays vital role in the study of control engineering. Some of the signals are repetitive in nature, like SINE, SQUARE, TRIANGLE etc, While some of them are non-repetitive. Non repetitive signals are single pulse or step input, parabola etc. There is a need to apply these as input to a control circuit to study the performance of a controller. This trainer is intended to simulate the basic test signals, like Step input, Ramp input and simulated Parabola. Using this trainer, it is possible observe the waveforms of basic test signals at the respective output terminals. a) Parabola generation b) Step generation c) Ramp generation a) Parabola Generation:- Parabolic test signal is a waveform obtained from the equation Y? = 4AX+C For various values of x find Y? from the equation above. By plotting the x and y values in a graph sheet parabola waveform can be obtained. The purpose of this exercise is to show how this can be computed and verified after experiment. A graph of X Vs Y produces the parabola function. The value of X and C can be simulated using different voltages to define the parabola curve. Taking square root of Y? gives both positive and negative values of y i.e. ? y. b) Step Generation:- Step test signal produces a two-state pulse as long as the pulser is pressed. The output swings in the range of 0 to 4V DC. c) Ramp Generation:- Ramp test signal is a waveform that rises from 0 to +5 volts in a particular time period and once it reaches +5 volts it suddenly drops to zero without any delay. The repetitive rate can be changed in the range of 700Hz to 1Khz with peak amplitude in the range of 0 to 5V DC. This trainer has necessary processing blocks to accomplish the above function generation. This unit has necessary power supplies and signal sources. An external digital multimeter and a 15MHz dual beam Oscilloscope is required to view the waveforms. See Enlarge Click to Enlarge ON-OFF CONTROL TRAINERS ON-OFF control by the very name suggests that the system have Input and Output elements. The inputs can be from a digital data or analog data. The electronics in-between the input and output performs the comparisons and sends a control signals to output elements. The output element namely either a heater, solenoid, digital data or analog signal are set to, either ON or OFF status depending on the input conditions. This is what the digital control is all about. The following trainers can act as ON-OFF controller. See Enlarge Click to Enlarge ON-OFF CONTROL TRAINERS USING EXPERIMENTAL MODULES This is an ON-OFF control trainer using digital circuit. This trainer consists of the following modules. The Microprocessor trainer is used as controller while the other support modules act as Input Output elements. For better understanding of Control action, we recommend Dual relay module Model IM-12 as output element. There are many input experimental modules. Some of those may have output elements also. When ordered as ON-OFF control trainer, these selected I/O modules are put together and supplied. Input Modules:- Switches and LED Module Model IM-6 8 Channel ADC Module Model IM-1A 12 bit high speed Analog to Digital Converter Module Model IM-2 Keyboard Display Interface Module Model IM-18Output Modules:- Dual Relay Module Model IM-12 Solid State Relay Module Model IM-13 Digital to Analog Converter Module Model IM? 5 Pneumatic Trainer Model IM-26 See Enlarge Click to Enlarge DEDICATED ON-OFF CONTROL TRAINERS The following are dedicated ON-OFF control trainers. These trainers have built-in Input and output elements embedded into these trainers. These require additionally a controller to do the control action. There are various Microprocessor trainers available for this purpose. They are Microprocessor trainer Model MPT-85 or MPT-J-85 or MPT-86 or MCT-31/51 when you want to program at machine level. This trainer has provision to connect to IBR-1. This card is used as an ADD-On interface card, when you want to use higher level language like, C / C++, VB, or VC++ etc. This Add-On Card Model IBR-1 uses IBMPC computer as controller. The descriptions of the following trainers are available elsewhere in the catalogue. Please read for detailed description of these trainers. See Enlarge [1] 2 [ Next»] Go to Top