Lesson 1.1: Power and Battery Backup

⚡ The Logic (Mermaid)

graph LR
    AC[240V AC Mains] --> PS[12V DC Power Supply]
    PS --> BAT[12V Backup Battery]
    PS --> CTRL[Controller/Expander]
    PS --> DETV[Detector Sensor 
Power]
    CTRL --> ACC[Door Accessories]

Hardware Landmark: Integriti SMART PS

!400
Above: The Integriti 3A Smart PSU PCB. Note the AC (Input), BATT (Battery), and LAN+/DET+ (Output) terminal blocks.

🧠 The Concept

The Power Supply is the heart of the system. In Inner Range systems, we use Supervised Power Supplies that tell the controller if the AC mains has failed or if the battery is low. Always ensure your total current draw (Locks + Readers + Modules) does not exceed 80% of the rated supply.

🛠️ Hands-on Steps

Check AC: Ensure the green "Power" LED is lit on the transformer.
Measure Output: Use your multimeter to verify ~13.8V DC at the battery terminals (charging voltage).
Connect Battery: Ensure correct polarity (Red to +, Black to -).
Test Load: Disconnect AC and verify the controller stays alive on battery power.

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