La. Admin. Code tit. 28 § CV-1723

Current through Register Vol. 50, No. 11, November 20, 2024

Section CV-1723 - Motors, Motor Controllers and Process Controllers

A. Function, Operation, and Characteristics of Various Types of Motors (AC, DC, Dual Voltage, Repulsion, Universal, 3-Phase, Squirrel Cage, Synchronous):

1. physical parts of various motors;

2. utilize information sheets, plans, schematics, and motor nameplates to gain information;

3. motor losses;

4. starting and operating characteristics;

5. methods to identify windings in DC motors;

6. means for providing for field failure, current limit, voltage and speed control;

7. block diagrams to demonstrate power supplies, armature, field and control features;

8. torque, locked rotor current, no-load speed, and slip;

9. reasons for low-voltage starting;

10. function, operation, and characteristics of stepping motors.

B. Proper Techniques for Motor Installations:

1. necessary calculations for electrical requirements per code;

2. correct power factor;

3. proper wire type and size;

4. appropriate connections;

5. how various motors can be made to run at different speed or in reverse direction:

a. schematics;

b. connections to reverse or change speeds;

6. identify unmarked motor leads;

7. steps for proper handling of motors:

a. checks for mechanical defects;

b. factors to be checked when a motor arrives at jobsite;

c. methods for putting motor into storage.

C. Function, Operation, and Characteristics of Motor Controllers, Circuits and Devices:

1. ways and means of starting and stopping motors;

2. operation of magnetic coil;

3. use of magnetic starters and controllers;

4. correct sizing of magnetic starters and controllers;

5. difference between starters and controllers;

6. function, operation, and characteristics of overload protective devices:

a. thermal overload;

b. magnetic overload;

7. schematics for various control circuits;

8. two-wire control circuits;

9. three-wire control circuits;

10. interlocking methods;

11. reversing and sequential controllers;

12. jogging, inching, plugging;

13. multiple start-stop controls and selector switches;

14. phase failure relays;

15. various manual and automatic speed control techniques;

16. function, operation, and characteristics of variable frequency drives;

17. function, operation, characteristics, and installation procedures for programmable logic controls:

a. function of central processing unit;

b. memory types and sizes;

c. user and storage memory;

d. back-up batteries;

e. peripheral devices;

18. ladder diagrams;

19. function, operation, and characteristics of timers, counters, sequencers;

20. utilize appropriate manuals and information for start-up, maintenance and testing;

21. utilize schematics for manual starters, automatic starters, speed regulators and controllers.

D. Function, Operation, and Characteristics of Switches and Relays:

1. schematics including switches and relays;

2. installation and connection methods for various switch types;

3. installation and connection methods for various relays;

4. function, operation, and characteristics of electronic sensor and pilot devices;

5. function, operation, and characteristics of control transformers:

a. leads of control transformers;

b. proper sizing of control transformers.

E. Mechanical Connections to Utilize Motors:

1. operation of mechanical clutches and magnetic drives;

2. direct and offset drives;

3. proper pulley sizes required.

F. Process Control System and Devices:

1. operating requirements followed by manual and automatic controllers;

2. function, operation, characteristics, and installation of:

a. closed loop and open loop systems;

b. feedback control;

c. proportional control;

d. integral control;

e. derivative control;

3. block diagrams including control systems and devices;

4. function, operation, and characteristics of sensors and transmitters.

La. Admin. Code tit. 28, § CV-1723

Promulgated by the Department of Education, Board of Elementary and Secondary Education, Trade and Industrial Education, LR 32:578 (April 2006).

AUTHORITY NOTE: Promulgated in accordance with R.S. 17:6(A)(10) and R.S. 17:10.