EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
5th Edition
ISBN: 8220102803503
Author: Petruzella
Publisher: YUZU
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Question
Chapter 7, Problem 1RQ
Program Plan Intro
- The main purpose of mechanical timing relays is to delay the opening and closing of contacts for circuit control.
- Its operation is almost similar to that of a control relay.
- The only difference is that the contacts of a mechanical timing relay are used to operate at a preset time interval, that is, after the coil is energized or de-energized.
- One example for mechanical timing relay is Pneumatic timing relay.
Expert Solution & Answer
Explanation of Solution
Difference between timed and instantaneous contacts of a mechanical timing relay:
Timed contacts | Instantaneous contacts |
Timed contacts change its state only when the time is lapsed. | Instantaneous contacts change its state as long as the power is supplied to the timer coil. |
Timed contacts are designed to delay the process control. | Instantaneous contacts are designed to hold or seal the contacts in a control circuit. |
When a coil is energized, these contacts delay from opening or closing. | When a coil is energized, this contact closes off open immediately. |
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Chapter 7 Solutions
EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - Prob. 3RQCh. 7 - Prob. 4RQCh. 7 - a. What are the two methods commonly used to...Ch. 7 - Prob. 6RQCh. 7 - Prob. 7RQCh. 7 - Prob. 8RQCh. 7 - For a TOF timer: a. When is the enable bit of a...Ch. 7 - Explain what each of the following quantities...
Ch. 7 - State the method used to reset the accumulated...Ch. 7 - Study the ladder logic program in Figure 7-40 and...Ch. 7 - Study the ladder logic program in Figure 7-42, and...Ch. 7 - Prob. 6PCh. 7 - Prob. 7PCh. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Prob. 11PCh. 7 - Prob. 13PCh. 7 - When the lights are turned off in a building, an...
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