Motor Controls: Timers

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johnbowens
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139048
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Motor Controls: Timers
Updated:
2012-03-01 23:58:15
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JATC IBEW motor controls timers
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NJATC, Motor Controls: timers, 2010
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  1. Functions and techniques divide industrial timers into how many categories? What are they? NJATC, Motor Controls: timers, 2010 PP 127
    Dashpot controlled timers, synchronous clock timers, and solid-state timers.
  2. Mechanical timers also called dashpot timers and electronic timers are often called what? NJATC, Motor Controls: timers, 2010 PP 127
    Timing relays are also called this.
  3. Which is more accurate a mechanical timing relay or an electronic timing relay? NJATC, Motor Controls: timers, 2010, PP 128
    An electronic timing relay is more accurate
  4. The reaction of the timers output to a change in the input is set by the timer function. Timer manufacturers offer a range of output functions however the timer functions available from most suppliers include What? NJATC, Motor Controls: timers, 2010, PP 128
    On delay, off delay, on and off delay, one-shot, fleeting off delay, repeat cycle (or flasher) are all of these.
  5. The two most common functions used by a timer are what? NJATC, Motor Controls: timers, 2010, PP 128
    On delay and off delay are the most common functions used by this.
  6. On delay timers have no change during the timing with the output contacts. On delay timers are also called what? NJATC, Motor Controls: timers, 2010, PP 129
    Delay on energize or DOE.
  7. What type of timer is a device with a preset time. That starts after the input signal is removed from electronic timing relay or power is removed from a mechanical timing relay? NJATC, Motor Controls: timers, 2010, PP 129
    This describes an OFF DELAY timer.
  8. The timed contacts of the timer immediately change state when the timer is energized or initialized and returned to their original state after the set time delay has elapsed describes what type of timer? NJATC, Motor Controls: timers, 2010, PP130
    Off delay timer also known as DODE
  9. Components drawn on motor control drawings are in their what state? NJATC, Motor Controls: timers, 2010, PP 130
    These components are in the deenergized or on the shelf state, also called the normal state.
  10. Associate on delay with the delay starting when timers are turned on, or energized. Associate off delay with? NJATC, Motor Controls: timers, 2010, PP 132
    The delay starting when the mechanical timers are turned off or deenergized. Removal of the trigger or power starts the delay time.
  11. The arrow points up or down when depicting on or off delay and how do you remember this? NJATC, Motor Controls: timers, 2010, PP 132
    The arrow points up with on delay and down with off delay. This is best remembered by using the analogy of what would stay on or off a shelf.
  12. On delay timers have what type of contacts and what type are associated with off Delay? How can this be remembered? NJATC, Motor Controls: timers, 2010, PP 132
    • Both start with and NO or NC no letters are repeated in the on delay timer. Answer: ON DELAY- NOTC and NCTO
    • OFF DELAY- NOTO & NCTC. The letters are repeated in the OFF DELAY timer.
  13. There are two mechanical timers that are used in industrial applications, what are they? NJATC, Motor Controls: timers, 2010, PP 133
    The synchronous timer and the dashpot timer are used in these applications.
  14. In a Synchronous timer when the trippers are gold or silver pegs inserted on the periphery of the rotating dial this indicates what by color? NJATC, Motor Controls: timers, 2010, PP 133
    Gold is the on time setting and Silver is the off time setting.
  15. The Electronic or solid-state time delay timer has a time delay with ranges from what? NJATC, Motor Controls: timers, 2010, PP 135
    Fractions of a second to hundreds of minutes, and is considered extremely accurate, describe this type of timer.
  16. Timers with or without external triggers usually have what? NJATC, Motor Controls: timers, 2010, PP 135
    Without external triggers these usually have 8 pin bases and with external trigger requirements use an 11 pin configuration.
  17. The term "dry contact" on the external control switch of a non-programmable electronic timer indicates what? NJATC, Motor Controls: timers, 2010, PP 135
    The term indicates that the external switch contacts must have low current switching characteristics.
  18. What type of timer rarely has instantaneous contacts? NJATC, Motor Controls: timers, 2010, PP 135
    Single function timers rarely have these.
  19. The contacts of solid-state timers have limited current carrying capacity, usually less than how many amps? NJATC, Motor Controls: timers, 2010, PP 135
    These contacts on this type of timer usually have less than 10 A current carrying capacity.

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