Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 7, Problem 1RQ
What are the two basic classifications of timers?
Expert Solution & Answer
To determine
Identify the two basic classifications of timers.
Explanation of Solution
Timers are relays that operate after a specified time delay to fend off the malfunction of the motor.
Timers are classified into two types as follows:
- On-delay relay.
- Off-delay relay.
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- 11) Get a kinematic diagram (schematic view) equivalent to the following mechanism and its degree of freedom.arrow_forwardIn 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.arrow_forwardBased 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.arrow_forward
- In what ways do controllers for various devices aid in operation?arrow_forwardThe symbol used for normally close contacts in PLC is a. O b. Oc. O d. HEarrow_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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