Codan Radio Communications CASC165A Manual De Usuario

Cascade Power Supply

Cascade System Modules Operation Guide

OG-CASC-SYS-MOD-1-0-0P

THEORY OF OPERATION

The PSU is designed to offer a stable, low noise, output signal of 48V. The main components are 

the two bricks converting the input voltage into 48V. Mounted on the mainboard (DC-DC -48V to 48V 

Isolated PSU) these bricks are designed for telecommunication purposes and provide the isolation 

required for CASCADE operation. An auxiliary board (-48V to 13.8V Isolated AUX) is also attached to 

the mainboard providing a 13.8V output voltage for external use.

The PSU is designed to be used in a CASCADE subrack with the 

fan assembly running. The PSU is not designed to be used as a 

standalone unit because it requires cooling for normal operations.

Input Filter

The input filter is used to limit the conducted emissions of the power supply and offer filtering for noise 

coming in or out of the PSU.

Temperature Sensors

For temperature monitoring, sensors (U11 and U12)—located close to the bricks—are monitoring 

the 48V board temperature and sending the exact temperature to the microcontroller (U10). The 

microcontroller in turn sends the measurements to the other components of the CASCADE via the 

FIB connection to control the fan speed.

For over-heating, three levels of protection are included:
1. 

Software Protection – if the temperature is too high, the CASCADE fan control system will 

automatically increase the fan speed to lower the internal temperature of the PSU.

2. 

Pre-set Temperature Protection – from the bricks themselves. 

3. 

Thermostats – (48V: Q2, Q4 / 13.8V: Q2) connected to the On/Off connection and at a factory 

preset temperature of 95°C. These thermostats turn the converter OFF if the board temperature 

is higher than the preset temperature.

Voltage and Current Measurement

For the 48V right and left and the 13.8V, the current and voltage is measured independently and the 

information is transmitted to the microcontroller. The microcontroller is comparing the levels within its 

preset nominal levels and enables the corresponding LED in the front of the enclosure. In case of

errors, the alarm light will be ON and the corresponding output LED will be OFF.