Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 41, Problem 4RQ
To answer the following questions refer to the circuit in Figure 41–6.
What is the purpose of timer TR in this circuit?
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In relation to the circuit presented below, mark the alternative(s) that you consider correct.
1 To enable actuator A2 to advance, it is necessary to switch valve V2 to the leftmost position and ensure that valve V1 is in its initial (intermediate) position.
2 Switching valve V2 to the leftmost position allows actuator A2 to advance, but for this to happen, valve V1 must also be switched to the leftmost position.
3 When activating valve V1, using the locking lever installed on the left side of it, the two actuators (A1 and A2) are allowed to advance.
4 Hydraulic pump B1 is a simple variable displacement type.
5 Valves V1 and V2 have a TANDEM center.
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.
Name
Section 5-2: Line Diagrams-Signals,
Decisions, and Actions
In the following application, a temperature switch controls a heating contactor and a flow switch is used to
ensure there is enough air flow. If there is not enough air flow, an alarm is sounded. Complete the required
information.
1. List all the signal devices in the circuit.
2. List all the action devices in the circuit.
3. List the decision part of the circuit that automatically sounds the alarm if there is a problem.
4. When the heating element is on during normal operation, is the flow switch open or closed?
CIRCULATING
2
L1
FAN
TEMPERATURE
SWITCH
TR
HEATING
ELEMENTS
FLOW
SWITCH
-HOT AIR
PADDLE
AIR FILTER
NORMALLY CLOSED
FLOW SWITCH
65
ALARM
(SOUNDS IF NO FLOW FOR
15 SECONDS OR MORE)
Date
HEATING
CONTACTOR
TR
ON-DELAY
TIMER
SUPPLY AIR
COLD AIR
(3) TIME SET= 15 SEC
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Chapter 41 Solutions
Understanding Motor Controls
Ch. 41 - To answer the following questions refer to the...Ch. 41 - To answer the following questions refer to the...Ch. 41 - Prob. 3RQCh. 41 - To answer the following questions refer to the...Ch. 41 - To answer the following questions refer to the...Ch. 41 - Prob. 6RQCh. 41 - To answer the following questions refer to the...Ch. 41 - To answer the following questions refer to the...Ch. 41 - Prob. 9RQCh. 41 - Prob. 10RQ
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- Refer to the circuit shown in Figure 25–5. Assume that timer TR1 is set for a delay of 10 seconds and timer TR2 is set for a delay of 5 seconds. When the START button is pressed, the motor starts. After 10 seconds the S1 contacts open and the motor continues to accelerate, but never reaches full speed. After a delay of about 30 seconds, the motor trips out on overload. Which of the following could cause this problem? TR1 coil is open. S2 coil is open. S1 coil is open. R coil is open.arrow_forwardRefer to the circuit shown in Figure 2614. What is the purpose of timer TR2?arrow_forwardRefer to the circuit shown in Figure 241. Assume that timer TR is set for a delay of 10 seconds. When the START button is pressed, the motor starts in low speed. After a delay of 30 seconds the motor is still in its lowest speed and has not accelerated to normal speed. Which of the following could not cause this condition? a. The START button is shorted. b. Timer coil TR is open. c. Contactor coil R is open. d. Timed contact TR did not close after a delay of 10 seconds.arrow_forward
- Refer to the circuit shown in Figure 247. Assume that all timers are set for a delay of 5 seconds. When the START button is pressed the motor starts in its lowest speed. After a delay of over 10 seconds, the motor is still running in the lowest speed. Which of the following could cause the problem? a. TR1 coil is open. b. TR1 coil is shorted. c. S2 coil is open. d. S1 coil is shorted.arrow_forwardName two methods used by electronic timers to obtain their time base.arrow_forwardRefer to the circuit shown in Figure 7-10. If wire number 11 were disconnected at the normally open auxiliary M contact, how would the circuit operate? Figure 7-10 Numbers are placed beside all components.arrow_forward
- Refer to the circuit shown in Figure 252. Assume that timer TR is set for a time delay of 10 seconds. When the START button is pressed, the motor does not start. After a period of 10 seconds, the motor starts with full line voltage applied to it. Which of the following could cause this condition? a. Timer TR coil is open. b. CR coil is open. c. Contactor S coil is open. d. Contactor R coil is open.arrow_forwardRefer to the circuit shown in Figure 4221. Assume that the THIRD SPEED push button is pressed. The motor starts in second speed, skipping first speed. After 5 seconds, the motor accelerates to third speed. Which of the following could cause this problem? a. S1 contactor coil is open. b. CR1 contactor coil is open. c. TRl timer coil is open. d. S1 load contacts are shorted.arrow_forwardTo answer the following questions refer to the circuit shown in Figure 41–10. Assume that the third speed push button is pressed. Explain the sequence of operation for the circuit.arrow_forward
- Refer to the circuit shown in Figure 269. Assume that timer TR is set for a delay of 10 seconds. When the START button is pressed, the motor does not start. After a delay of 10 seconds, the motor suddenly starts with its stator windings connected in delta. Which of the following could cause this problem? a. TR timer coil is open. b. 2M contactor coil is open. c. S contactor coil is open. d. 1M starter coil is open.arrow_forwardRefer to the circuit shown in Figure 3311. You are to construct this circuit on the job. Would it be possible to use an 11 pin control relay for 4CR?arrow_forwardRefer to the circuit shown in Figure 15-6. The STOP button is shown to be an emergency STOP button. What does the symbol used for the STOP button actually represent?arrow_forward
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