As part of your role as a maintenance technician working for a medium sized manufacturing company you are employed working on automated control systems and production plant. Your supervisor has stated that there is an investment plan in place and some machinery is due for an upgrade or replacement over the next few years and they have asked you to produce a report relevant to speed control and drives associated with machinery and manufacturing processes. Task 1 A. You are to produce a report relating to ac drives and their use within industry and within this report you are to illustrate the various operating modes of the drives and support this with corresponding circuit (brief), block and waveform diagrams to illustrate the operation of an induction motor on open loop control and how a closed loop control can be used to improve the speed control. In your report you are to give examples of 3 phase voltage and frequency relationships relative to speed control of the machine and briefly explain how a 3 phase output can be derived from a single phase input and the advantages this gives Within your answer you are to include details from manufacturers drive data for variable frequency drives and give reasons why there is a limit to the frequency range that a drive can cover for motors, typically for a machine that is designed for a 50 Hz operation. Within the report you are to include details of what Pulse Width Modulation is and how it is used to achieve varying voltage outputs and how sinusoidal waveforms can be achieved from a d.c. supply using PWM techniques and show with the aid of diagrams how controlled rectifiers can give variable d.c. level that may be required for the creation of the a.c. voltages
As part of your role as a maintenance technician working for a medium sized manufacturing company you are employed working on automated control systems and production plant. Your supervisor has stated that there is an investment plan in place and some machinery is due for an upgrade or replacement over the next few years and they have asked you to produce a report relevant to speed control and drives associated with machinery and manufacturing processes.
Task 1
A. You are to produce a report relating to ac drives and their use within industry and within this report you are to illustrate the various operating modes of the drives and support this with corresponding circuit (brief), block and waveform diagrams to illustrate the operation of an induction motor on open loop control and how a closed loop control can be used to improve the speed control.
In your report you are to give examples of 3 phase voltage and frequency relationships relative to speed control of the machine and briefly explain how a 3 phase output can be derived from a single phase input and the advantages this gives
Within your answer you are to include details from manufacturers drive data for variable frequency drives and give reasons why there is a limit to the frequency range that a drive can cover for motors, typically for a machine that is designed for a 50 Hz operation.
Within the report you are to include details of what Pulse Width Modulation is and how it is used to achieve varying voltage outputs and how sinusoidal waveforms can be achieved from a d.c. supply using PWM techniques and show with the aid of diagrams how controlled rectifiers can give variable d.c. level that may be required for the creation of the a.c. voltages
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