1. Consider the diagram involving a staircase light control using two switches. The staircase bulb should come ON if any one of the switch is operated and if any one of the switch is operated again the bulb should go OFF. The figure below shows the control implemented as a wiring diagram using two switches (switch 1 is on the lower floor of the staircase and switch 2 is installed at the upper floor of the staircase) and a light bulb. Initially, Switch 1 and Switch 2 are in the OFF position. If Switch 1 is actuated, then the upper circuit will switch ON the bulb. If switch 2 is actuated it will open the upper circuit and close the bottom circuit. However, switch 1 is already open at the bottom circuit, so the bulb will not glow. Actuating switch 1 again will close the bottom circuit and the bulb will glow. Let the following symbols be representative of the switches if the set-up is implemented with PLC. ||-- (normally open contact) |/|-- (normally closed contact). How many normally open contact switches will be needed?

1. Consider the diagram involving a staircase light control using two switches. The staircase bulb should come ON if any one of the switch is operated and if any one of the switch is operated again the bulb should go OFF. The figure below shows the control implemented as a wiring diagram using two switches (switch 1 is on the lower floor of the staircase and switch 2 is installed at the upper floor of the staircase) and a light bulb. Initially, Switch 1 and Switch 2 are in the OFF position. If Switch 1 is actuated, then the upper circuit will switch ON the bulb. If switch 2 is actuated it will open the upper circuit and close the bottom circuit. However, switch 1 is already open at the bottom circuit, so the bulb will not glow. Actuating switch 1 again will close the bottom circuit and the bulb will glow. Let the following symbols be representative of the switches if the set-up is implemented with PLC. ||-- (normally open contact) |/|-- (normally closed contact). How many normally open contact switches will be needed?

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter18: Three-wire And Separate Controls

Section: Chapter Questions

Problem 1SQ: Draw a control circuit with no-voltage protection. Describe how this method of wiring protects the...

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