Line C 3-Phase Motor Starters & PID Loop Controls

Question 1

What will the size of the wire be from the mag starter to motor if 230 volts is used?

Answer 1

6 AWG

Question 2

What will the size of the mag starter be if 460 volts is used?

Answer 2

NEMA 2

Question 3

What size overloads are required for the motor starter if 460 volts is used?

Answer 3

31.25 Amps
25 amps
1.15 service equals 125% of 25 amps
less than 1.15= 115%
rule 28 -208?

Question 4

What will be the rated size of the disconnect time-delay fuses if 230 volts is used?

Answer 4

87.5 Amps

Question 5

For a PID controller, what does the proportional do?

Answer 5

It produces an output value that is proportional to the current error value

Question 6

For a PID controller, what does the derivative do?

Answer 6

It sums the error over time

Question 7

For a PID controller, what does the proportional gain do?

Answer 7

It determines the ratio of output response to the error signal

Question 8

For a PID controller, what does the integral do?

Answer 8

It acts as a brake or dampener on the control effort