Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 11, Problem 6RQ
Name two methods used by electronic timers to obtain their time base.
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Based on the timing diagram below, choose the correct statement regarding Timer Relay.
On
Coil
Power
ff
+ 5 →
Seconds
Closed
Contact
Status
Open
Time
Select one or more:
O a. This is the OFF-Delay Relay
O b. This is the ON-Delay Relay
O c. The relay can used in automatic gate at car parking application :- when sensor detect car already pass
by to parking area, motor to control gate closing will turn ON after a few minutes.
O d. When the coil energized, the relay contact will make connection at the same timing.
Define the following examples as path, motion, or function generation cases:
18
Chapter 11 Solutions
Understanding Motor Controls
Ch. 11 -
What are the two basic classifications of...Ch. 11 - Explain the operation of an on-delay relay.
Ch. 11 - Prob. 3RQCh. 11 - Prob. 4RQCh. 11 - How are pneumatic timers adjusted?Ch. 11 -
Name two methods used by electronic timers to...Ch. 11 - Refer to the circuit shown in Figure 1123. What is...Ch. 11 - Refer to the circuit shown in Figure 1123. What is...Ch. 11 - Refer to the circuit shown in Figure 1123. What is...Ch. 11 - Prob. 10RQ
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- Help me solve this question ASAP !!arrow_forwardBuild a ladder logic diagram showing the timer delays.arrow_forward2) The continuous stopwatch timing method was used to obtain the observed times for a worker-machine task. Only one cycle was timed. The data are recorded in the table below. The times are listed indicate the stopwatch reading at the end of the element. Elements a, b, and d are worker-controlled elements. Element c is machine controlled. Elements a and d are external to the machine-controlled element, while element b is internal. Every four cycles, there is an irregular worker element that takes 1.32 min rated at 100% performance. For determining the standard time, the PFD allowance is 15% and the machine allowance is 30%. Determine a. The normal time b. Standard time for the cycle c. If worker efficiency is 100%, how many units will be produced in one 8-hour shift? d. If the actual time worked during the shift is 6.86 hours, and the worker performance is 125%, how many units will be produced? Description of Worker Time Description of (min) Rating (%) Element Machine Element Worker…arrow_forward
- What exactly does the inability to resolve the stopping problem mean?arrow_forwardBlock diagram and explanation of the applications of open loop system: Automatic washing machine, Automatic toaster system, Traffic light controller and Furnace without thermostatic control but with timing devicearrow_forwardQUESTION 27 Pneumatic timers have better repeat accuracy that electronic timers. True Falsearrow_forward
- number 11arrow_forwardK:42)arrow_forward5. Study the ladder logic program in Figure 7-34 on page 198, and answer the questions that follow: a. What is the purpose of interconnecting the two timers? b. How much time must elapse before output PL is energized? c. What two conditions must be satisfied for timer T4:2 to start timing? d. Assume that output PL is on and power to the system is lost. When power is restored, what will the status of this output be? e. When input PB2 is on, what will happen? f. When input PB1 is on, how much accumulated time must elapse before rung 3 will be true? Ladder logic program L1 Inputs FIGURE 7-34 PB1 PB2 PB2 1 36 PB1 2 3 E 3 PB1 T4:2 DN T4:1 DN -RTO RETENTIVE TIMER ON Timer T4:1 Time base 1.0 Preset 2900 Accumulated RTO RETENTIVE TIMER ON Timer Time base Preset Accumulated T4:1 (RES) T4:2 (RES) (EN) 0 (DN) a. The input is true, and EN is 1, TT is 1, and DN is 0. b. The input is true, and EN is 1, TT is 1, and DN is 1. c. The input is false, and EN is 0, TT is 0, and DN is 0. d. The input is…arrow_forward
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