Understanding Motor Controls
Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 26, Problem 9RQ

Refer to the circuit shown in Figure 26–14. What is the purpose of timer TR2?

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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.
17- The memory unit of PLC is used to write the program to control output device. Select one: True False
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.
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