User Manual

Fibre Optic Master and Remote Site
User Handbook
Document Number: 60-212701HBK - Issue No. 1 Page 32 of 50
4.2.4.9. DC-DC Converter 24V -12V (13-003011)
The DC/DC converter fitted is an AFL assembled, high power PCB unit with an 8 amp at 12V output
capability. The circuit is basically an O.E.M semiconductor regulator (one side of which has a heatsink
mounting plate, usually bolted to the casing of a Cell Enhancer) and smoothing components built onto
a printed circuit board with screw block terminations.
In event of failure this unit should not be repaired, only replaced.
13-003011 Specification
PARAMETER SPECIFICATION
Input Voltage range: 18-28V DC
Output voltage: 12V±0.5V
Max. current load: 8.0Amps
operation: -10°C to +60°C Temperature
range:
storage: -20°C to +70°C
Size(PCB): 190 x 63mm
Weight (Loaded PCB): 291gms
4.2.4.10. Mains Filter (8 Amp) (13-003301)
The 8A Mains Filter Assembly (13-003301) has been designed to remove mains-borne interference
caused by external electrical radiation.
Many filters exist which partially satisfy the criteria needed for cell enhancer power supplies (the main
criteria being high continuous current) but a more cost efficient solution was realized using AFL’s own
manufacturing capability.
13-003301 Specification
PARAMETER SPECIFICATION
Maximum surge current: 6.5kA (8/20)
Maximum leakage current: <0.3mA (@ working voltage
Maximum continuous current: 8A
Maximum continuous voltage: 253V
Working voltage: 230V (nominal)
Impulse energy absorption: 420J
Ambient temperature limits: -25%C to +85%C
Humidity: 5-95% RHNC
Case material: ABS plastic (IP50 rated)
Maximum attenuation: 70dB (common mode 50-60Hz)