Answered: LIGHT CURTAIN

Engineering

Electrical Engineering

LIGHT CURTAIN

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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Concept explainers

Types of Braking

A brake is a mechanical device that absorbs energy from a moving system and inhibits its motion. It helps to slow or stop a moving vehicle, axle, wheel, etc. The braking system uses friction between two types of surfaces that are pressed together that convert kinetic energy into heat energy. For instance, we know that in the case of regenerative braking, the brakes convert energy into electrical energy which can be used for later use. The conversion of kinetic heat energy into potential energy is stored in the form of pressurized oil or air. In the brake disc, oil, or fin, the eddy current brakes convert kinetic energy into the electric current with the help of a magnetic field which is converted into heat.Generally, such braking systems apply to the moving axles of wheels. They may also take other forms like moving fluids' surface. In the case of drag racing cars, both wheel brakes are used whereas in parachute or airplanes, both wheel brakes or drag flaps raised in to the air are used.

Question

1.) LIGHT CURTAIN DISTANCE CALCULATIONS
A mechanical press has a stopping time for its press-brake mechanism of 0.39 sec and a stopping time for the control circuit of 0.06 sec. The brake monitor is set for 0.58 sec, and the minimum object sensitivity is 0.78 in. Calculate the minimum safe distance that the light curtain can be installed from the press.

2.) A robot system has a protective barrier enclosing the work cell area. The total time for the system to come to a full halt after power is removed is 4 seconds, and an additional distance of 1.2 meter is required because of the height of the guard gate would allow operators to reach over it.
Determine the minimum distance from the guard gate to the closed part of the robot work envelope, in meters.
NOTE: 1 meter = 1,000 millimeters

Branch of science that deals with the stationary and moving bodies under the influence of forces.

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