Motion Sensor Diagram
Learn PIR motion sensor wiring and connection diagram with step-by-step guide, working principle, installation tips, and testing for home and office lights.
PIR motion sensor wiring diagram
PIR motion sensor wiring and connections have three terminals: live, neutral, and load. It also automatically turns ON the lamp when motion is sensed, and turns off after a predefined delay.
Relay assembly diagram
In a digital timer wiring diagram, a contactor indicates the manner in which a programmable timer regulates high current loads in a safe manner. The digital timer controls the scheduling, whereas the contactor turns the main power on and off between motors, pumps, heaters, or lights. The contactor coil (A1/A2) is fed by the output of the timer; on energizing, the main contacts close and provide power to the load, and on de-energizing, the contacts open to isolate it.
Common circuit: Supply MCB/RCCB Digital Timer (control), Supply Contactor Coil, and Contactor Main Contacts Load. Neutral and earth should be properly wired, and a control fuse should be installed to cover the timer circuit. This process decreases manual operation, eliminates arcing at low-voltage switches, and increases reliability and energy efficiency with precise schedules. It is suited to water pumps, street/area lighting, HVAC, and industrial machinery.
Work / Installation (Inputs → Outputs)
Input: Main supply → MCB → RCCB.
- Feed phase/neutral from RCCB to the digital timer (power).
- Use the timer’s relay output to supply the contactor coil A1; connect A2 to neutral (or opposite for DC coils).
- Route the main phase through the contactor’s L1/L2/L3 → T1/T2/T3 (use one pole for single-phase). Connect neutral directly to load (or via a pole if 2-pole contactor).
- Bond protective earth to all metal enclosures and to the load. Output: When the timer closes its relay, the coil energizes, contactor closes, and the load receives power per schedule.
Frequently Asked Questions - Motion Sensor Diagram:
What is PIR motion sensor wiring?
It is the wiring connection of a PIR sensor to control a lamp or load automatically.
How many terminals does a PIR sensor have?
Three terminals: Live (L), Neutral (N), and Load (Out).
Where is a PIR sensor used?
In corridors, staircases, garages, gardens, and offices.
How is the sensor connected to a lamp?
Sensor load terminal connects to lamp phase; lamp neutral connects directly to supply.
Can the sensitivity of PIR sensor be adjusted?
Yes, most sensors have a knob to adjust detection sensitivity.
What is the time delay in PIR sensor?
It determines how long the lamp stays ON after motion stops.
Does PIR sensor work in daylight?
It can, but lux setting can limit operation to night only.
Is earthing required?
Yes, for safety, connect earth wire if available.
What happens if wiring is incorrect?
The lamp may not turn ON or may flicker; correct wiring is essential.
Can multiple lamps be connected to one PIR sensor?
Yes, if the sensor contact rating supports the total load.
