Lab Final Test

Question 1

1 turn of motor

Answer 1

= 3 pulses

Question 2

set point

Answer 2

input (I)

Question 3

process variable

Answer 3

output (O)

Question 4

control variable

Answer 4

error (e)

error = I - O

Question 5

disturbances

Answer 5

closed loop can sense these and self correct

Question 6

PID block

Answer 6

• KC: proportional constant
• TI: time integral constant
• TD: time derivative constant

Question 7

good feedback loop

Answer 7

can get to output fast, detect & correct disturbances

Question 8

integral windup

Answer 8

output becomes too large or too small while the feedback does not follow the output

Question 9

how to avoid integral windup

Answer 9

when motor is stopped, the PID loop is put in manual mode which pauses the PID calculation & allows CV to be forced to specific value

Question 10

why use PID

Answer 10

• it is an error correction system
• used to monitor a system and maintain a certain value
• used in feedback control