# Advanced Controls I

SKEL 121## Course Description

Prerequisite: SKEL 102. Topics include: vacuum and vapor tubes, resistance welding controls, induction heating, motors, inverters, polyphase rectifiers, op-amps transducers, instrumentation, closed loop controls, servo systems, temperature controls, troubleshooting. (75)

## Outcomes and Objectives

### Students will be able to demonstrate an understanding of power control fundamentals.

#### Objectives:

- Describe the basic methods of controlling power in a DC circuit.
- Describe the basic methods of controlling power in an AC circuit.
- Describe the basic operation of a SCR, TRIAC, UJT, PUT, DIAC, and IGNITRON.
- Analyze a phase shift control power system.
- Analyze a pulse position control power system.

### Students will be able to demonstrate an understanding of the power control techniques used in a resistance welding process.

#### Objectives:

- Describe the basic principles of the resistance welding process.
- Describe how resistance welding differs from other joining processes.
- Describe the Sequence steps used in the resistance welding process.
- Analyze a typical electronic control system used in a resistance welding machine.

### Students will be able to demonstrate an understanding of the power control techniques used in the induction heating processes.

#### Objectives:

- Describe the basic principles of induction heating.
- Describe the relationship of frequency and the depth of heating.
- Describe the various methods of creating the appropriate frequencies for induction heating.
- Analyze a typical electrical/electronic circuit used in a motor-generator system.
- Describe the metering system used in MG power units and be able to calculate the required tuning capacitance for a usable power factor.
- Describe a typical Radio Frequency Oscillator system used to generate the very high frequency and high power needed for induction heating.
- Analyze a typical electronic control system used to control the power of the RF Oscillator.
- Describe the basic concepts of using SCR switching to generate AC power.
- Analyze typical electronic circuits used to generate medium frequencies for induction heating.

### Students will be able to demonstrate an understanding of polyphase rectification and the use of SCR's to control DC power.

#### Objectives:

- Describe the benefits of polyphase rectification.
- Analyze typical circuits used for polyphase rectification and the use of SCR's for control of the power output.
- Describe the basic concepts of DC motor speed control.
- Analyze typical electronic power control circuits for DC motor control using phase shift and pulse position firing of SCR's from an AC supply.
- Describe the basic concepts of pulse frequency and pulse width control.
- Analyze typical DC motor speed control using pulse frequency and pulse width control from a DC supply.

### Students will be able to demonstrate an understanding of the basic feedback control systems used for process control and servomechanisms.

#### Objectives:

- Describe the use of operational amplifiers to perform electronic integration and differentiation.
- Describe the operation of an open loop control system.
- Analyze the operation of an open loop control system.
- Describe the operation of a closed loop control system.
- Analyze the operation of a closed loop control system.
- Draw functional block diagrams for closed loop control systems.
- Compare the performance of on-off, proportional, proportional plus integral, proportional plus derivative, and P.I.D. control systems.

### Students will be able to demonstrate an understanding of transducers and their use in measurement of control system parameters.

#### Objectives:

- Describe the techniques used to measure displacement.
- Describe the techniques used to measure force.
- Describe the techniques used to measure pressure.
- Describe the techniques used to measure temperature.
- Describe the techniques used to measure velocity.
- Describe the techniques used to measure light and other radiant energy.
- Describe the techniques used to measure vibration and acceleration.
- Describe the techniques used to measure liquid flow.
- Describe the techniques used to measure humidity.
- Describe the techniques used to measure magnetic changes.

### Students will be able to demonstrate understanding of output devices used to control processes and machines.

#### Objectives:

- Describe the operation of fluid valves.
- Describe the operation of electrohydraulic servo valves.
- Describe the use of relays and contactors.
- Describe the operation of split phase AC motors.
- Describe the operation of AC servo motors.
- Describe the operation of DC servo motors.
- Describe the operation of Stepper motors.
- Describe the operation of brushless DC motors.

### Students will be able to demonstrate an understanding of selected closed loop control systems used in typical industrial processes.

#### Objectives:

- Analyze the operation of temperature control systems.
- Analyze the operation of pressure control systems.
- Analyze the operation of position control systems.
- Analyze the operation of strip mill tension systems.
- Analyze the operation of an automatic weighing system.
- Analyze the operation of a CO2 gas controller on a carburizing furnace.
- Analyze the operation of humidity control systems.
- Analyze the operation of DC motor speed control systems.
- Analyze the operation of AC motor speed control systems.
- Analyze the operation of electro-hydraulic speed and positioning systems.

### Students will be able to demonstrate an understanding of the basic principles of controlling processes and machines with microprocessors.

#### Objectives:

- Describe the basic concepts of a microprocessor.
- Describe the input/output circuits used to interface machine controls to a microprocessor system.
- Describe the basic differences between microprocessor and programmable logic controller (PLC) systems.
- Analyze the application of microprocessor control to robotics.