LAC 28:CV.1723
LAC 28:CV.1723. Motors, Motor Controllers and Process Controllers
Cite as La. Admin. Code tit. 28, pt. CV, § 1723
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.