ELCON PS1550 1550/LM-230 Module

 According to version, the modules have been predisposed for function at 115 Vac / 130 Vdc or 230 Vac.
The 1550/LM circuit consists of an internal line rectifier with capacitive filter and decoupling diode. The inputs are protected by two time-lag fuses (10 A or 20 A respectively based on type of system) . The voltage once rectified is made available to Power Modules via Mother Board bus +IN / -IN.
The overall value of the bank of capacitors is enough to guarantee in case of mains failure, an interim 15ms output time ( both for type-230 and type-115) with nominal voltage load (36A).
The line Modules present a green LED on panel front which lights up when the mains has reached the correct va- lue for system function. A special circuit with the utilization of a TL431 measures input voltage and gives the go ahead signal (LED on and alarm relay pick-up current- energize) when 75 % of nominal value has been reached. An implemented hysteresis value for which the LED is set OFF occurs due to inferior voltage value.
Inrush current is limited by a NTC (15 n or 10 n based on type of system) placed in series with the line that is shortcircuited by relay contacts RL2 and RL3 after the system has been started.
A 24 V auxiliary current is thus generated in the Module which serves the control circuitry and inrush current relays. The integrated circuit TOP 223Y is utilized for this purpose: a high voltage channel N MOSFET and a 100 KHz oscillator for voltage control PWM function have been implemented in it. This component is powered via the control pin C which is normally at 5.7 V.

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