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PSUPS20A12E
3
1. Technical description.
1.1. General description.
A buffer PSU is intended for an uninterrupted supply to CCTV system devices requiring stabilized voltage of
12V DC (+/-15%)
. The PSU has two circuits: first
1x5A / 12V DC
for supplying the recorder and
16x0,8A / 13,8V DC
for
both cameras. Current efficiency of the PSU amounts to:
1. Output current 16x0,8A + 5A re 2A battery charging
*
2. Output current 16x0,7A + 5A re 4A battery charging
*
3. Output current 16x0,4A + 5A re 8A battery charging
*
Total current of the rec battery 20A
*
max.
In case of 230V mains power loss, a battery back-up is activated immediately.
The approximate backup time is given assuming that all output ports are used (using typical devices and 65Ah
batteria). The electricity consumption for own needs and the energy efficiency of the power intake track were taken into
account. The exact description of how to perform the calculations can be found at:
The PSU is mounted in a metal enclosure (RAL 9003 colour) that accommodates a 65Ah/12V battery. The
enclosure is equipped with a micro-switch indicating unwanted opening of the door (faceplate).
1.2. Block diagram (fig.1).
Fig.1. Block diagram of the PSU.
1.3. Description of PSU components.
Table 1. Description of components and connectors module LB8.
Component no.
[Fig. 2]
Description
F1
÷F8
glass fuses
L1
÷L8
LED voltage indication at the outputs
AUX1 ÷ AUX8
independently protected outputs
IN1-, IN2-
power supply inputs of the fuse module
Table 2. Description of components and connectors output filter.
Component no.
[Fig. 3]
Description
F
AUX
glass fuses
LAUX
LED voltage indication at the outputs
AUX
– output
IN
–
power supply inputs, output filter
*
See chart 1
