The primary power supply provides the required power and related supervision functions for the panel. The supply is comprised of three major components: the power supply monitor module, model 3- PSMON, which mounts on the rail chassis, and the heat sink assembly, model 3-PPS, which mounts on the rear of the rail chassis, and the ac power distribution assembly. The primary power supply provides filtered, regulated power to power all modules connected to the rail chassis as well as 24 Vdc for auxiliary applications. The primary power supply is rated at 24 Vdc @ 7.0A for all outputs. The primary power supply supervises the standby batteries and provides a dual rate constant current battery charger featuring automatic temperature compensation. The charger is capable of charging batteries up to 17 Ah. A battery monitor circuit disconnects the batteries from the system when battery voltage drops below acceptable limits, which prevents memory problems and a total discharge of the batteries. Specifications Power Input: 230 Vac, +10%, -15%, 2.0 A, 50 Hz Internal DC Output: 24 Vdc @ 7.0 A max Auxiliary DC Output: Two 24 Vdc @ 3.5 A max. ground fault and short supervised, power limited outputs Operating Environment Temperature: 23 to 104 °F (-5 to 40 °C) Relative Humidity: 93% RH non-condensing