The LAD series comes in two versions: the basic model (LAD-120/240/360/600) and the version with UART communication (LAD-360/600xU). Both feature a low-profile (1U) design to meet the application requirements for fire protection systems.
The basic TTL model (signal only)
has TTL alarm outputs that report correct AC power (OK), battery disconnection/reverse polarity, full battery, and discharge via external circuitry.
• AC OK
• Battery disconnected/reverse polarity
• Low battery
• Battery charged
• Discharge
The following is an external circuit with a DC voltage source V and a current-limiting resistor R: (The maximum supply voltage is 50VDC and the maximum load current is 30mA)
Advanced models with UART communication:
Through UART communication, the power supply can communicate with the MCU (Main Control Board) to read the load voltage, current, operating status, and fault protection. This simplifies hardware design and enables intelligent control functions.
Example application: Fire protection system (UPS backup application)
Mains Power Active (Normal Operation): When the mains power supply is functioning correctly, backup equipment (such as alarms, sensors, or monitoring systems) is powered through the LAD-360.
Mains Power Off (UPS Function): When the mains power supply fails (e.g., due to a power outage), the LAD-360's UPS (Uninterruptible Power Supply) function is automatically activated. The LAD-360 switches to its internal battery and supplies power to the backup equipment. This ensures that the fire protection system continues to function even during a power outage.
Figure of the fire alarm system control cabinet
In summary, the LAD-360 provides a reliable solution for maintaining the continuous operation of fire protection systems, ensuring safety and early detection of any emergency. This device can be found on the Electrónica OLFER website, which offers a wide range of products.
Author: Zhendong Wang, MEAN WELL Technical Service Center.
Translation: OLFER Electronics Marketing Department
