Description
INTRODUCTION
AC Variable Speed Drives has replaced the conventional electromechanical contactors for induction motors. Even though in the earlier days engineers hesitated to change the conventional starting method to soft starting using solid-state switches as the cost were relatively high, but now almost all the induction motors are connected to power electronics based variable speed drives or inverters as it is commonly called in industry. Nowadays, the variable speed drives are found very cost effective compared to electromechanical switches especially when the questions of efficiency, energy saving and reliability arise. However, as variable speed drive is not a stand-alone device, there are many practical problems and failures confronted by design, project and maintenance engineers/personnel. In this course, participants will be exposed to the fundamental and the importance of variable speed drives particularly in energy saving. It is also to acquaint the participants with the common mistakes associated to the variable speed drives, troubleshooting techniques, sizing criteria and parameters setting for various applications.
Objective
The objective of the programme is to provide the participants with the fundamental and the important of variable speed drives particularly in energy saving. It is also to acquaint the participants with the common mistakes associated to the variable speed drives, troubleshooting techniques, sizing criteria and parameters setting for various applications.
Who should attend?
Engineers, Technicians and Supervisors who are involved in the design, operation and maintenance of variables speed drives systems. Also recommended for those who are interested to gain knowledge in variable speed drives system.
CURRICULUM
- The concept of variable speed drives
- Inside details of variable speed drives – Rectifier, Controlled Rectifier, the importance of DC link, functions of DC link capacitors
- What determines the ride through capabilities of a variable speed drive?
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- What converts DC voltage to variable voltage variable frequency? Inverter technology, the importance of pulse width modulation for harmonic reduction
- How about dynamic braking – braking resistor
- What are the recent developments in variable speed drives technology – V/f, FVC and DTC, where do you use them
- Why soft starting and stopping are important – soft starter
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- What are the types of failures – failures due to human and manufacturing
- Understand power and control circuits
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- Participants will be entertained by movies on the principle of variable speed drives and applications
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- What will happen if you under or oversize variable speed drives
- Nuisance tripping of variable speed drives – wrong parameter settings, wrong faulty part replacement, drive location
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- How do you select an appropriate size of variable speed drives for a conveyor and hoisting systems. Calculations example with reference to actual manufacturer manual will be discussed.
- How do you select and size appropriate braking resistor, contractors and circuit
breakers?
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- How can you reduce total operating costs at your plant?
- How variable speed drive improves system performances, productivity and quality?
- How much and how can you save electric energy usage in your plant?
- What are the possible internal and external failures of variable speed drives?
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- What are the minimum start-up procedures you should know?
- How do you check if the rectifier is fine?
- How do you check if DC bus is shortcircuited?
- How to check the inverter bridge, power transistor (IGBT)?
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- How to interpret most of the common fault signs found in typical variable speed drives?
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- Understanding the wiring diagram of typical variable speed drives
- Learn the principle of drives programming
- The importance and the consequences of selecting wrong parameter values – for Acceleration and Deceleration Ramp, Motor Thermal Protection, Skip frequency, Automatic DC injection braking current, JOG operation, Stopping methods, Automatic catching of a spinning load, Switching frequency
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