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Motor Control 8

Basic Timers

QuestionAnswer
1. List two reasons timing circuits are used in motor control applications. reduce need for multiple machine operators, they enable process events that are started and stopped at different intervals.
2. Timers are divided into categories based upon what? how they control timing and types of timing functions they preform
3. List three basic methods that timers use to manage timing. motor driven, electronic, and dashpot
4. What types of timing functions are mechanical timers capable of on delay DOE, off delay DODE
5. What applications are clock timers best suited for? production systems
6. What does the abbreviation DOE stand for in relation to timers? Delay on energized
7. Explain DOE timing and state when the contacts change state. page 129
8. Once the DOE timed contacts change state, how long will they remain in this position? until it is de-energized
9. Assume a DOE timer is configured with one normally closed contact with a time delay of 30 seconds. What is the position of the contact prior to power being applied to the coil? N/C
9b. What is the position of the contact IMMEDIATELY after power is applied to the coil? closed
9c. What is the position of the contact 30 seconds after power is applied to the coil? Open
9d.What is the position of the contact as soon as power is removed from the coil? closed
10. Would a DOE timer be appropriate for keeping a motor starter energized after power was removed from the timer's power input? No
11. Draw the symbol for the contacts listed below: NCDOE , NODOE page 32
12. page 33. Identify the following a) Normally open sets of contacts 1 and 3 N/O, 8 and 6 N/O
12b. Normally closed sets of contacts. 8 and 5 N/C
12c. Common connection pin for normally open Pin 6. 8
13. Identify the following page 33. What is the purpose of Pins 2 and 7? turns on timer begins time delay
14. What are the two basic categories of dashpot timers? pnuematic, fluid
15. How is timing managed in a dashpot timer? controlling fluid flow or airflow through small orphas (orifice)
16. What adjustments should be made to the orifice to increase the length of actuator time? decrease air flow
17. What is the typical timing accuracy of a pneumatic dashpot timer? accurate within a few seconds
18. A part of the pneumatic dashpot that air enters or leaves during the timing function is called a ____. bellow
19. Pneumatic timers have narrow trmming ranges with settings from ___ to ___ seconds. .1 to 180
20. Pneumatic timers are most accurate near their ___ range. medium range
21. What does the abbreviation DODE stand for? Delay on de-energize
22. Another method of describing the DODE timing function is the time delay of the contacts starts when the coil is ____? deenergized
23. Assume a DODE dashpot timer is configured with one normally closed contact with a time delay of 30 sec. What is the position of the contact prior to power being applied to the coil? closed
23b. What is the position of the contact IMMEDIATELY after power is applied to the coil? open
23c. What is the position of the contact 20 seconds after power is removed from the coil? open
23d. What is the position of the contact 30 seconds after power is removed from the coil? closed
24. Explain why fluid (oil) type dashpot timers are more accurate than pneumatic dashpot timers. oil density is only effected by heat and not humidity or pressure
25. Motor control drawings show their components in what state? normal deenergized state
26. Dashpot timers use ___ to initiate the timing process. electromagnetic timer
27. Explain the timing process for a dashpot timer no answer
28. Dashpot timers can be configured with contacts that are normally ____ or normally ___. open, closed
29. When dashpot timing assemblies are attached to a control relay, the entire mechanism is generally referred to as a ____. timer
30. Draw the symbol for the contacts listed below. NCDODE AND NODODE PAGE 34
31. What happens if the external trigger switch recloses before the timing period ends for a DODE solid-state relay? stays energized
32. What is the construction of a sold-state timer? electronic components on a printed circuit board
33. Provide the proper symbol for the following abbreviations. NODOE, NCDOE, NODODE,NCDODE
34. Assume a DODE solid-state timer is configured with one ormally open contact with a time delay of 10 seconds. What is the position of the contact prior to the input of the external trigger switch? open
34b. What is the position of the contact IMMEDIATELY after an input signal is received from the external trigger? closed
34c. What is the position of the contact IMMEDIATELY after the input signal is removed from the external trigger? closed
34d. What is the position of the contact 10 seconds after the input signal is removed from the external trigger? open
35. Besides the timed contacts, what other connections are required for a solid-sate DODE timing relay? voltage input external trigger switch
36. Give some example applicatons for DODE timing circuits fan motor run for cooling
37. Is it possible for a dashpot relay to be configured to perform both on-delay and off-delay simultaneously either or
38. During the operation of a dashpot timer, when do the instantaneous contacts change state? when the coil is energized or deenergized
39. What is an important difference between dashpot timers and solid-state timers performing DODE timing functions? solid state has external trigger switch and needs constant power
40. compare dashpot timers with solid-state timers, and explain the difference in the requirements for initiation of the timing function Timing is initiated with a electromagnetic coil for dashpot and by electronic components for solid-state timers, dashpot- uses fluid flow and adjustable knob or needle, solid-state has very accurate timing and quick to replace.
41. What are the pin numbers, for the common pins, associated with each set of normally open and normally closed contacts? 1 and 11
42. Identify each set of pin numbers that are normally closed 11 and 8, 1 and 4 (?)
43. Identify each set of pin numbers that are normally open 1 and 3, 11 and 9 (?)
44. Identify the pin numbers where the constant voltage source is to be connected 2 and 10
45. Identify the pin numbers where an external trigger switch is to be conne ted 5 and 6
46. The majority of dashpot timers are designed with ___ -delay and ___-delay timing functions on, off
47. The relationship between dashpot timing decks and their electromagnetic relay bases is that the contacts located on the relay base are ___ whereas the contacts located on the timing deck are __ contacts. instantaneous time
48. Most dashpot timers are designed to control two different types of contacts. What are they? instantanious time
49. Give some sample applications for DOE timing circuits Pumping station. Delay pump until it is primed.
50. How do many elecrnic timers regulate time delay? use RC time constant circuit
51. Compared to dashpot timers, what can be said about the accuracy of solid-state timers more accurate
52. Why are solid-state timers more accurate than dashpot timers Because they have no moving parts
53. What are the timing ranges for electronic timers fractions of a second to hundreds of minutes
54. Explain the expected timing band for an electronic timer with a single timing range 1.8 to 180 seconds
55. Solid-state timers are available iin a variety of mounting configurations. One of the most common mounting configurations uses a ___ style base that accepts ___ or ___ type terminations plug-style, round, blade-type
56. Explain the difference of solid-state timers that are designed with 8 pin connections and solid-state timers with 11 pin connections 8-pin do not have external timers, 11-pin DO have external timers
57. Most solid state timers are constructed with a minimum of two timed contacts that may be connected normally ___ or normally ___. no answer
58. Are instantaneous contacts generally a part of a solid-state timer NO
59. How an instantaneous contacts be achieved with a solid-state timer no answer
60. What are the current carrying capacities for most solid-state relays less then 10 amps
Created by: JoshHampton
 

 



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