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The PSM assembly provides the 24VDC power required for powering the MCU and additional modules. The PSM assembly consists of two parts, the Main Power Supply Unit and the AC/DC Switching Power Supply Unit. The Main Power Supply Unit provides AC input power to the AC/DC Switching Power Supply Unit. The AC/DC Switching Power Supply Unit returns 24VDC to the Main Power Supply Unit and supplies the system.
The AC input power is monitored by the Main Power Supply Unit. If the AC input voltage would ever fail, the Main Power Supply Unit cuts off the AC input power and switches to the standby power source. The PSM assembly supervises and maintains the 24VDC batteries that supply secondary power for the system. A green status LED (LP24) turns on while the PSM assembly operates normally. All of the 24VDC circuits ground fault detection is provided by circuitry in the PSM assembly.