Reference to the processcontrol relay ladder diagram
History
Answer the following with reference to the processcontrol relay ladder diagram of Figure 1-18 of thischapter:
a. When do the pressure switch contacts close?
b. When do the temperature switch contacts close?
c. How are the pressure and temperature switches connected with respect to each other?
d. Describe the two conditions under which the motor starter coil will become energized.
e. What is the approximate value of the voltagedrop across each of the following when theircontacts are open?
(1) Pressure switch
(2) Temperature switch
(3) Manual pushbutton
