Control Engineering Manufacturer,Supplier and Exporter in India

The Thermal Control Process Apparatus a common industrial process, including an air-conditioning plant, where a combination of adjustments can control temperature. These can be:

• Varying the heat energy input to the system.
• Varying the speed of a circulating fan.
• Using a variable vane to restrict the flow.
• Two temperature sensors measure the temperature of the block. 
• One sensor is in direct thermal contact with the block. 
• The apparatus has a variable-speed fan that forces air through a duct. 
• In the duct is an electrically-heated process block. 
• A balance of the heat gained from electrical heating and heat lost by convection and conduction gives a steady temperature at the block. 
• The other sensor mounts on an insulating spacer to introduce thermal inertia and variable-time constants into the control loop. The apparatus has scaled down time constants for shorter laboratory time.
• A servo-driven vane, mounted after the fan and the process block, creates a variable restriction downstream for more advanced experiments. 
• The control problem is to keep the process temperature within acceptable limits while it works under various conditions. 
• A combination of regulating the electrical energy to the heater, varying the air flow rate and rotating the vane gives the heat control. 

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• The Coupled Tanks Apparatus investigates basic and advanced control engineering principles. 
• This includes the study of static and dynamic systems. 
• It is also an ideal system to use with other control strategies such as fuzzy logic. 
• Shows fluid transport and liquid level control problems in process control. 
• A rotameter-type flow meter shows the flow rate. 
• An electronic flow meter measures the flow rate.  
• A scale on each tank allows students to check the level-sensor calibration. 
• Variable-speed pump forces water into the left-hand tank. 
• A valve connects this tank to a second tank, if needed, for two-tank experiments. 
• Each tank has a level sensor that gives output signals proportional to the water level in each tank. 
• The basic control problem is to regulate the liquid level in one of the tanks by varying the speed of the circulating pump. 

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• The Ball and Beam Apparatus shows the control problems of unstable systems, for example a rocket or missile during launch, which needs active control to prevent the missile going unstable and toppling over. 
• The apparatus has a steel ball which is free to roll on two parallel tensioned wires. 
• The wires are on a beam that pivots at its centre. 
• The system is a double integrator, so it is naturally unstable. 
• It needs active feedback control using phase-advance methods.
• A servo motor controls the beam angle and sensors measure the beam angle and ball position. 
• The basic control problem is to vary the beam angle to control the ball position.

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• Engine Speed Control Apparatus shows the problems of regulating the speed of rotating machines, especially problems with non-linear control systems.  
• The basic purpose is to adjust a motorised valve to regulate the engine speed under load. A d.c. generator connects to the engine output and loads the engine.
• It is a scale-model engine, driven by compressed air (not supplied) for safety. 

Advanced experiments show:

• Non-linearity compensation using dither signals.
• Multiple loop and minor loop.
• System modelling from step response information.
• P+I control and root locus methods.

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• Coupled Drives apparatus shows the problems of controlling speed and tension in coupled drives. 
• A manual control allows the user to adjust the spring tension at the swinging arm. 
• The apparatus has two electric motors, coupled by a continuous flexible belt. 
• The belt also passes over a swinging arm with a ‘jockey wheel’ that measures the belt speed and tension. 
• The basic control problem is to vary the torque in the motors to regulate the belt speed and tension. 
• The user guide also shows techniques for speed and tension control, simultaneous control of velocity and tension, and analysis of multi-variable control systems.
• Many applications use coupled drives, for example: magnetic tape drives, textile machines and paper mills. 

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• Ball and Hoop Apparatus shows the use of electromechanical servo systems for position and velocity control. 
• The apparatus has a steel ball that rolls inside a hoop. 
• The hoop is free to rotate, but controlled by a servomotor. 
• Transducers give outputs of the hoop and ball positions. 
• When the hoop is under angular position control, the ball moves like a cylindrical pendulum. 
• This allows students to use it as a model for the study of liquid slop dynamics. 
• It also works as a model to show liquid slop problems, for example: aircraft missile fuel storage, fuel tankers and industrial pumping systems. 

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• Servo Trainer shows d.c. servo position and speed control systems using typical industrial techniques. 
• A manual control allows the user to set a position control setpoint. 
• The d.c. generator statically or dynamically loads the servomotor. 
• It has a d.c. servomotor, a d.c. generator and a flywheel mounted on a common shaft. 
• Analogue 0 to ±10 V control signals vary the servomotor shaft speed in either direction. 
• An optical sensor measures the speed and shows it on a panel-mounted digital meter. 
• An electric clutch connects or disconnects the shaft to a 30:1 reduction gearbox for position control studies. 
• To adjust the shaft inertia, comes with two extra interchangeable inertia discs (flywheels). 

For advanced experiments, the Servo Trainer includes extra ‘block’-type circuits that can add non-linear and fully adjustable effects of:

• Deadzone or ‘deadband’
• Anti-deadzone
• Hysteresis
• Saturation

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• This compact unit has analogue electronic circuits connected in blocks. 
• These blocks mimic the important parts of industrial controllers. 
• Clear diagrams on the front panel of the controller show the blocks, each of which has its own set of connection sockets. 
• The user connects the blocks in any way that they need and then connects them to their chosen products in the range. The controller also includes an interface with D/A (digital to analogue) and A/D (analogue to digital) connections.

The blocks include:

• Summing junctions.
• Phase lead. 
• Proportional and integral blocks.
• A function generator and digital voltmeter.
• A complete three-term PID (proportional, integral, derivative) block.
• Fully adjustable potentiometers that can work as setpoints or attenuators.

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• The Digital Interface is for use with most products in Control Engineering range, but it will also work with any other compatible laboratory equipment. 
• It is an alternative to the Controller, when the user only needs the interface part.  
• It converts analogue inputs from other equipment into digital signals for a computer. 
• It will allow the user to monitor up to eight input signals and control up to four output signals. 
• It also converts the digital signals from a computer into analogue signals to control other equipment. 

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