• Sensors on 3 landing gear • The pilot has a Gear Down Control switch • When the Gear Down Control is in the down position, the circuit should check the status of the landing gear. The circuit should light an LED GREEN when all of the gear are DOWN, otherwise it should light a RED LED. • When the Gear Down Control is in the up position, the LEDs should be OFF. • 3 Sensor output: 1=up; 0=down • 1 Gear Down Control: 1=Gear Down; 0=gear up • 2 LEDs: 0=off; 1=on

• Sensors on 3 landing gear • The pilot has a Gear Down Control switch • When the Gear Down Control is in the down position, the circuit should check the status of the landing gear. The circuit should light an LED GREEN when all of the gear are DOWN, otherwise it should light a RED LED. • When the Gear Down Control is in the up position, the LEDs should be OFF. • 3 Sensor output: 1=up; 0=down • 1 Gear Down Control: 1=Gear Down; 0=gear up • 2 LEDs: 0=off; 1=on

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter13: Limit Switches And Proximity Control

Section: Chapter Questions

Problem 1SQ: Draw a simple circuit showing how a red pilot light is energized when a limit switch is operated by...

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resulting HIGH output from the negative-AND gate turns on the green LED display. The other NOR gate operates as a NOR to detect if one or more of the landing gears remain retracted when the "gear down" switch is activated. When one or more of the landing gears remain retracted, the resulting HIGH from the sensor is detected by the NOR gate, which produces a LOW output to turn on the red LED warning display. FIGURE 3-40 Landing gear sensors Extended = LOW Retracted HIGH +V Red LED Gear retracted Green LED All gear extended Related Problem What type of gate should be used to detect if all three landing gears are retracted after takeoff, assuming a LOW output is required to activate an LED display?