INTRODUCTION There are so many control loops in the industries nowadays.In this session we are going to discuss about difference between feedback and feedforward controls loops FEEDFORWARD CONTROL LOOPS A feedback control loop is reactive in nature and represents a response to the effect of a load change or disorder. A forward control loop, on the …
DIFFERENCE BETWEEN FEEDBACK AND FEEDFORWARD CONTROL LOOPS Read More »
Introduction Boiler Controls are specifically designed equipments that maximize the efficiency of new and / or existing boiler and burner plant. Boiler Controls equipment is considered to include the following: Oxygen Trim Controls Oxygen trim controls automatically monitor the oxygen or carbon monoxide concentration in boiler flue gases and vary the air/fuel supply to the …
Introduction There are two types of control systems namely Open Loop & Closed Loop system                             Open loop control systems are non-feedback control systems  Closed loop control systems …
Introduction The override control concept is a technique by which process variables are kept with in certain limits, usually for   protective purposes. Override control maintains the process in operation but within and under safer conditions.  Override control To illustrate override control, consider the simple process shown in Figure A hot, saturated liquid enters a process surge tank, and then it is then pumped into the process. Normally, the tank operates at the level shown, but if the level gets too low the liquid will not have enough net …
Introduction. Process control is the automatic control of an output variable by sensing the amplitude of the output parameter from the process and comparing it to the desired or set level and feeding an error signal back to control an input variable. In order to produce a product with consistently high quality, tight process control …
ADAPTIVE CONTROL Adaptive control is a method whereby the gain of a system can be varied depending on the position of the set point. The following shows a simple example of why this is useful in control systems. Figure shows the level control of a separator. The level in the separator can be set to …
RATIO CONTROL A ratio controller is a special type of feed forward controller where disturbances are measured and their ratio is held at a desired set point by controlling one of the streams. Ratio control is used when two fluids must be mixed together in a specific ratio. A practical way to do this …