ELT 105: Electric Relay Control and Electrical Fabrication

Electric Relay Control

Control Logic          

 Segment 1- Logic Elements (AND, OR)

1. Describe the function of relay logic control circuits.
2. List the six elements of control logic.
3. Describe the function of AND logic and give an application.
4. Connect and operate an AND logic control circuit.
5. Describe the function of OR logic and give an application.
6. Connect and operate an OR logic control circuit.

 Segment 2- Logic Elements (NOT, NOR, NAND)

1. Describe the function of NOT logic and give an application.
2. Connect and operate a NOT logic control circuit.
3. Describe the function of NOR logic and give an application.
4. Connect and operate a NOR logic control circuit.
5. Describe the function of NAND logic and give an application.
6. Connect and operate a NAND logic control circuit.
7. Describe the function of MEMORY logic and give an application.

  Segment 3- Ladder Diagrams

1. Describe the function of a ladder diagram.
2. Describe the function of the four components of a ladder diagram.
3. Identify the four basic components of a ladder diagram.
4. Explain five rules of drawing a ladder diagram.
5. Read and interpret the operation of a circuit given a ladder diagram.
6. Connect and operate a logic circuit given a ladder diagram.
7. Design a ladder diagram using one or more logic elements.

 Segment 4- Electro-Pneumatic Solenoid Valves

1. Describe the function of a solenoid-operated fluid power valve.
2. Describe the function of a power diagram.
3. Connect and operate a circuit using a solenoid valve given a ladder diagram.
4. Design a control circuit in a ladder diagram format to operate a solenoid valve.

Sequencing Control

 Segment 1 – Relay Operation

1. Describe the function of an electromechanical relay and give an application.
2. Describe the operation of an electromechanical relay and give its ladder diagram symbol.
3. Read and interpret a basic ladder diagram with detached symbology.

Segment 2 – Relay Applications

1. Describe the operation of a relay used to energize a fluid power valve solenoid.
2. Connect and operate a relay to energize a fluid power solenoid.
3. Describe the operation of a relay performing control logic.
4. Design a Logic circuit that uses a relay.
5. Describe the function and operation of a seal-in circuit.
6. Connect and operate a relay to perform a seal-in function.

Segment 3 – Limit Switch Operation

1. Describe the function of a limit switch and give an application.
2. Describe the operation of a limit switch and give its schematic symbol.
3. Describe the operation of a limit switch in an event sequencing circuit.
4. Connect and operate an event sequencing circuit given a ladder diagram.
5. Design a logic circuit that uses a limit switch to sequence an event.

 Segment 4 – Limit Switch Applications

1. Describe the operation of a limit switch in a single-cycle cylinder reciprocation circuit.
2. Connect and operate a single-cycle cylinder reciprocation circuit.
3. Describe the operation of a limit switch in an event deenergizing circuit.
4. Describe the operation of a limit switch in a continuous-cycle reciprocation circuit.
5. Connect and operate a continuous-cycle cylinder reciprocation circuit.
6. Describe the operation of a safety interlock circuit.
7. Design a continuous-cycle cylinder reciprocation circuit with a safety interlock.

Timers and Advanced Systems

  Segment 1 – Time-Delay Relays

1. Describe the function of a time-delay relay and give an application.
2. Describe the operation of an on-delay timer relay and give Its Ladder diagram symbol.
3. Connect and operate a control circuit with a timer relay.
4. Design a time-driven traffic light circuit.
5. Describe the operation of an off-delay timer relay and give its sschematic symbol.

 Segment 2 – Time-Delay Relay Applications

1. Describe the operation of a timer relay in an unloaded motor start circuit.
2. Connect and operate a control circuit to perform an unloaded start of a motor.
3. Describe the operation of a timer relay in a cylinder dwell circuit.
4. Design a control circuit to perform a cylinder dwell.
5. Describe the function of a time-delay relay in time-driven sequencing.
6. Design a control circuit to perform time-driven sequencing.

Segment 3 – Multiple Cylinder Control

1. Describe the function of multiple cylinders in a machine.
2. Describe how multiple cylinders are controlled using one limit switch and give an application.
3. Design a dual-cylinder sequence circuit using one limit switch.
4. Describe how multiple cylinders are controlled with multiple limit switches and give an application.
5. Connect and operate a dual-cylinder control circuit using two limit switches.
6. Design a continuous-cycle multiple-cylinder circuit.

Segment 4 – Machine Modes of Operation

1. Describe the function of manual and automatic modes in machine operation.
2. Connect and operate a circuit having both automatic and manual modes of operation.
3. Describe two applications of manual controls.
4. Connect and operate a control circuit to simulate a two-pushbutton Jog circuit.
5. Describe five basic guidelines to follow when working with manual control circuits.
6. Connect and operate a two-pushbutton jog circuit that will jog two cylinders independently.
7. Design a continuous-cycle, synchronized cylinder circuit with a manual mode.

Electrical Fabrication

Introduction to Electrical Wiring

 Segment 1 – Electrical Terms

1. Describe two types of electricity and give an application of each.
2. Describe the function of the four basic components of an electrical circuit.
3. Define four common electrical measurements and give an application of each.
4. Describe how to use a voltage tester to check a circuit for electricity.
5. Use a voltage tester to check a wall outlet for electricity.

 Segment 2 – Electrical Safety

1. Describe ten basic electrical safety rules.
2. Describe the function of the National Electric Code (NEC).
3. Describe the function of the Underwriters Laboratory (UL) and Canadian Standards Association (CSA).
4. Check electrical components for UL and CSA approval.

 Segment 3 – Wire Stripping Techniques

1. Describe the operations of three tools used to strip insulation from a wire.
2. Describe how to strip insulation from a wire.
3. Strip insulation from wires using a stripping tool.

Segment 4 – Wire Termination Techniques

1. Describe the function and construction of two types of wiring terminals.
2. Describe two methods to connect wires to terminal screws.
3. Describe how to install a Spade-Lug connector on a wire.
4. Install a Spade-Lug connector on a wire.
5. Describe how to connect wires to a terminal strip.
6. Connect wires to a terminal strip.

Segment 5 – Power Cord Installation

1. Describe the function of a 3-wire AC circuit.
2. Describe the function of an AC electrical plug.
3. Describe how to connect a plug to an electric cord.
4. Connect an AC plug to an electric cord

Residential Wiring System Components

 Segment 1 – Wiring Systems

1. Describe three wiring systems accepted by the NEC and give an application of each.
2. Describe the function of electrical junction boxes.
3. Describe the function of an installation plan.
4. Describe how to read and interpret a wiring installation plan.
5. Read and interpret a wiring installation plan.

Segment 2 – Nonmetallic Cable Installation

1. Describe how to remove the sheathed jacket from nonmetallic cable.
2. Remove the sheathed jacket from nonmetallic cable.
3. Describe how to install cable connectors in an electrical box.
4. Install cable connectors in an electrical box.
5. Describe how to run nonmetallic cable between electrical boxes.
6. Run nonmetallic cable between electrical boxes and secure it.

Segment 3 – Switch Installation

7. Describe the operation of a standard electrical switch.
8. Describe how to connect an electrical switch.
9. Describe three common grounding methods used in junction boxes.
10. Connect an electrical switch.
11. Describe how to install a switch in a junction box.
12. Install a switch in a junction box.

Segment 4 – Outlet Installation

1. Describe the function of an electrical outlet.
2. Describe how to connect an electrical outlet.
3. Connect an electrical outlet.
4. Describe how to install an electrical outlet in an electrical junction box.
5. Install an outlet in a junction box.

Service Connection and Circuit Protection

  Segment 1 – Lighting Installation

1. Describe two common lighting systems and give an application for each.
2. Describe how to connect an incandescent light fixture.
3. Describe two common methods for splicing wires.
4. Connect an incandescent light fixture.
5. Describe how to install an incandescent light.
6. Install an incandescent light fixture.

 Segment 2 – Service Connection

1. Describe the function of a service entrance.
2. Describe the function of a service panel.
3. Describe how to connect a service panel to the service entrance.
4. Connect a wiring system to a service panel.

Segment 3 – Circuit Protection

1. Describe the function of circuit protection.
2. Describe the operation of fuses and circuit breakers.
3. Describe how to install a circuit breaker in a service panel.
4. Install a circuit breaker in a service panel.

 Segment 4 – 3-Way Switch Lighting Circuit Installation 

1. Describe the function and operation of a 3-way switch.
2. Describe how to connect a 3-way switch.
3. Install and connect a 3-way switch lighting circuit.