IT 435

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IT 435

• Week 3

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Circuit configurations that use operational
amplifiers

• Signal conditioning
• Transducers and Sensors produce small volts
• Op amps used to amplify signals
• Symbol for Op amp

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Determine gain for an operational amplifier

• Gain (non-inverting amplifier)
• A 1 (Feedback resistance / Input resistance)

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Circuit configurations that use operational
amplifiers

• Op amps can also be set up as
• Comparators
• Differential amplifiers
• Summers
• Integrators
• Threshold detector
• Magnitude not as important as comparison to a
  threshold

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Op Amp Comparator Circuit
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Window Comparator
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Differential Amplifier
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Summing Amplifier
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Summing Amplifier
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Integrating Amplifier
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Derivative (dx/dt) - Slope
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Recognize the symbols for control components

• Switches
• Fuses
• Transformers
• Transistors
• Capacitors
• Resistors
• Refer to textbooks, handbooks, NEMA

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List the major types of control diagrams

• Schematic
• Ladder
• Sequence List
• Wiring diagram
• Interconnecting diagram
• Printed circuit
• Block diagram
• Pictorial diagram
• Troubleshooting diagram

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Schematic

• First step in design of an electrical circuit
• Provides part numbers of components
• Often valuable for analysis of a circuit
• Understanding how it works
• Not always helpful for troubleshooting

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Schematic

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Ladder

• Sometimes called line or elementary diagram
• Derived from relay ladder diagrams

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Sequence diagram

• Written description of the operation of the
  ladder diagram
• Example
• All switches open to start
• Close SW1, SW2, or both, CR7 powered
• Closing SW3 powers CR8
• etc.

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Wiring diagram

• Shows how a group of electrical components are
  wired together
• Follows the physical layout of the equipment
• Spare wires for future use included
• Terminal strips often used to connect wires

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Wiring diagram
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Interconnection diagram Interfaces only
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Printed Circuit - Photo
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Block diagram
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Pictorial diagram
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Troubleshooting diagram
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Create a ladder diagram from a process description

• Storage tank pressure tank