Industrial Electricity 2

The Industrial Electricity 2 certificate builds upon the Industrial Electricity 1 certificate. Candidates should understand more complex motor starting circuits such as jogging, hand-off-automatic, reversing, and reduced voltage starting. They should be familiar with time-based, count-based and sequential control of multiple output loads utilizing control relay log…

 

 Electricity and Electrical Circuits

Describe a six step troubleshooting sequence.
Describe four methods of systems level troubleshooting and give an advantage of each.
Describe five types of in-circuit component tests.

Practice of Troubleshooting

Use the symptom and cause troubleshooting method to isolate a bad component.
Use the output-back troubleshooting method to isolate a bad component.
Use the half-split troubleshooting method to isolate a bad component.
Use the shotgun troubleshooting method to isolate a bad component.
Troubleshoot a two-wire control system.
Troubleshoot a three-wire control system.

Reversing and Jogging Motor Control

Reverse motor control


State the NEMA and IEC standard for reversing the rotation of a three-phase motor.
Describe the function and operation of a reversing magnetic motor starter.
Describe the function and operation of a drum switch.
 

Jogging

Describe the operation of two types of motor jogging circuits.
 

HOA/Manual Auto

Troubleshoot a control circuit which has manual and automatic modes.
Describe the operation of a Hand-Off-Automatic motor control circuit.

Automatic Input Devices

Components

Describe the operation of a limit switch and give its schematic symbol.
Describe the operation of a float switch and give its schematic symbol.
Describe the operation of a pressure switch and give its schematic symbol.
Motor Thermal Overload
 

Applications

Describe the operation of a pump control circuit.
Describe how to test an automatic input switch.
Design an overhead door motor control circuit.

Timer Control Functions

On Delay


Describe the operation of an On-Delay timer relay and give its schematic symbol.
Troubleshoot an On-Delay timer circuit.
 

Off Delay

Describe the operation of an Off-Delay timer relay and give its schematic symbol.
Troubleshoot an Off-Delay timer circuit.
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One Shot

Describe the operation of a one-shot timer and give an application.
Troubleshoot a timed one-shot motor control circuit.
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Repeat

Describe the operation of a repeat cycle timer and give an application.
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General

Describe how to test a timer relay.
Design a control circuit to perform an unloaded start of a motor.

Solenoid Activated Valves

Describe the function of a power diagram.
Describe the function of electro-hydraulic controls and give an application.
Describe the operation of two types of solenoid-operated pneumatic DCVs (1 or 2 coils)
Connect and operate a relay to energize a fluid power solenoid.

Control Relays

General / Components

Describe the operation of an electromechanical relay and give its ladder diagram symbol.
Describe the construction of a general purpose relay and give an application.
Describe the operation of a relay to perform control logic.
 

Application 

Describe the function of a seal-in circuit.

Sequential Control

Simple

Describe the function of a limit switch and give an application.
Describe the operation of limit switch in an event sequencing circuit.
Describe the operation of a continuous-cycle reciprocation circuit.
Connect and operate a continuous-cycle cylinder reciprocation circuit.
 

Complex

Describe how multiple cylinders are controlled with multiple limit switches and give an application.
Design a logic circuit that uses a limit switch to sequence an event.
Describe the operation of a sequence control circuit.
Troubleshoot a sequence control circuit(including limit switches, relays, timers and counters)

Introduction to Electronic Sensors

Photo

Describe the operation of a photoelectric sensor and give an application.
Connect and operate a photoelectric sensor.
 

Inductive

Measure and analyze inductive sensor performance.
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Hall Effect

Describe the operation of a Hall Effect Sensor and give an application.
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Capacitive

Connect and operate a capacitive sensor.
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General

List five advantages of electronic sensors and two disadvantages.

Counters

Describe the operation of an upcounter and give its ladder diagram symbol.
Describe the operation of a downcounter and give its ladder diagram symbol.

Electrical Control System Wiring

Blueprint Reading

Describe the function of an electrical print.
Interpret an electrical print.
 

Electrical Panel

Describe the function of panel wire ways.
Wire an electrical panel.
Secure wire bundles in an electrical panel.
​​​​​​​Color Coding/Wire Numbering
Describe the function of wire color coding in electrical control.
​​​​​​​Terminals and splicing/terminal blocks
Describe the function of electrical terminal blocks.
​​​​​​​Wiring/bundling/signal and power
Wire an electrical machine.

Raceways and Conduits

Construction techniques
Deburr conduit/reaming
Calculate conduit length given an application.
 
Components
Describe the function of conduit and list five types.
Describe the similarities and differences between intermediate metallic and rigid conduit.
 
General

Describe the function of a wiring system.

Conductors, Disconnects and Overcurrent Protection

Determining conductor sizing /insulation and length
Define conductor ampacity and describe the physical characteristics that affect it.
Describe how distance affects wire selection.
 
Disconnects
Describe how to size a disconnect.
 
Overcurrent Protection
Describe the function of overcurrent protection and list two types.

Counters

Describe the operation of an upcounter and give its ladder diagram symbol.
Describe the operation of a downcounter and give its ladder diagram symbol.

Control Transformers

Describe how to connect and operate control transformers with multi-voltage taps
Describe the function of a tap on the secondary of a transformer and give an application
 
Describe how to troubleshoot a transformer
Troubleshoot a transformer by measuring continuity
Describe the relationship between input and output current, voltage, power, and turns ratio for a control transformer.
Describe how to calculate the output voltage of a transformer 
Describe how control transformers are applied in industrial circuits
Describe the operation of a control transformer and give its schematic symbol

Power Transformers

Describe the operating data on transformer nameplates and the identification, marking and connection of their leads.
Describe the operating data on a transformer's nameplate.
 
Describe the basic characteristics of 3–phase AC electricity including grounded and ungrounded conductors, neutral, ground and wye and delta systems.
Describe the two most common three-phase voltage systems.
 
Describe the use of overcurrent protection and disconnect devices in 3–phase circuits.
Explain why time-delay fuses are used with motor starting circuits.
 
Describe why power transformers are used in industrial and commercial systems.
Isolation transformers
 
Grounding
Explain the importance of the equipment ground connection.

Electrical Safety

70E 
FRC – Fire Retardant Clothing requirements / laundry requirements
PPE Requirements – Clothing FRC, Cal/cm^2, Arc Flash Face Shield, Gloves, Shoes
Boundaries – Limited approach, Flash Protection Boundary
System Safety
Describe function of safety relay in a relay circuit
Describe function of interlock system
Master control MCR
List 10 basic rules of electrical safety. 
Describe the purpose of the lockout/tagout system used in industry. 
Perform a lockout/tagout. 
Describe how to verify all power is eliminated frorm the machine (specifically air)