Building Automation Lesson 4 Flashcards
What are the two types of devices used for control devices in lighting systems?
Input devices
Output devices
What is the most common form of automatic lighting control used in buildings?
Occupancy sensors
What technologies are used in occupancy sensors to sense people within a space? (3)
Passive infrared
Ultrasonic
Microwave
List two common types of photo cells
Photoresistors
Phototransistors
A ____is a solenoid operated, high power relay used with lighting circuits
Lighting contactor
Why do most lighting contactors use double- break contracts?
They provide better arc suppression
____is the automatic control of lights according to date and time.
Scheduling
What are two methods used to dim lighting?
- Reduce voltage to the lamp (voltage modulation)
2. Reduce time that full voltage is applied (phase control)
The___feature gradually raises light levels to the desired brightness
Soft on
What type of transformer has only one winding, which is tattooed on both the secondary and primary at various points to produce varying voltages?
Auto transformer
What are two primary functions of lighting control?
- Provide adequate lighting for tasks performed within a space.
- Conserve energy by automatically turning lamps off when they are not needed.
Automated lighting systems use one or more control functions to determine appropriate lighting levels based on what criteria? (5)
- Electrical power demand
- Time of day
- Available natural light
- Occupancy
- Use of the space
Automatic lighting control that users light level sensor to turn lamps on around dusk and off at dawn are called____.
Photocontrol
____is a lighting control system that switches or dims groups of lamps together to mixture of predetermined levels.
Scene lighting
