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Essential learning about induction motors – basics of AC drives and VFD

PID controller – a PID is the most commonly used feedback controller. A PID controller calculates an “error” value as the difference between a measured process variable and a desired set point. The Pid controller attempts to minimize the error by adjusting the process control inputs. The PID controller calculation involves three separate constant parameters, and is accordingly sometimes called three-term control: the proportional, the integral and derivative values, denoted P, I, and D. .

Auto tune controller – Auto tune controller provide economical control for a wide variety of processes, including heating, cooling, and heat/cool. When auto tune controller is used with the proper transmitters, these devices can also control pressure, flow, humidity, motion, or pH. The front panel is NEMA 2, 3R, and 12 rated for waterproof protection and are corrosion resistant. The sophisticated design of auto tuner controller incorporates the latest microprocessor and surface mount technology, compressing an unprecedented number of standard features into a compact 1/16 DIN package. The user can program control functions from the front panel; input types are DIP switch selectable. Multiple tuning modes allow the user to select from 3 standard tuning presets, manual tuning, or auto tuning.

Electronic motor drives into two categories: AC and DC. A motor drive controls the speed, torque, direction and resulting horsepower of a motor. A DC drive typically controls a shunt wound DC motor, which has separate armature and field circuits. AC drives control AC induction motors, and-like their DC counterparts-control speed, torque, and horsepower. A VFD controls the speed, torque and direction of an AC Induction motor. If you are not using VFD you are wasting energy and throwing money out the window. An AC drive may be considered by them as the variable frequency inverter and motor combination. It may even include the motor’s pulley.People in the electrical field and electrical suppliers usually refer to a variable frequency inverter unit alone, or an SCR power module alone (when discussing DC drives) as the “drive” and the motor as the “motor”. Manufacturers of VFD used to refer to the drive as an “adjustable speed AC drive”. To make matters worse when a motor is included in the package it may be referred to as an “adjustable speed AC drive system”.

A VFD is an adjustable speed drive. Adjustable speed drives include all types; mechanical and electrical. About AC drives, the main power components of an AC drive have to be able to supply the required level of current and voltage in a form the motor can use. The controls have to be able to provide the user with necessary adjustments such as minimum and maximum speed settings, so that the drive can be adapted to the user’s process.

Injection Moulding Controller – Manufacturers of Injection Moulding Controller provide total closed loop control for any Injection molding controller.

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