User Instructions

www.pulsar.pl PSUPS20A12CR
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
12 V DC (+/-15%). The PSU has two circuits: first 1x5 A/12 V DC for supplying the recorder and 16x0,8 A/13,8 V DC for
both cameras. Current efficiency of the PSU amounts to:
1. Output current 16x0,8 A + 5 A recorder + 2 A battery charging*
2. Output current 16x0,7 A + 5 A recorder + 4 A battery charging*
3. Output current 16x0,4 A + 5 A recorder + 8 A battery charging*
Total current of the receivers + battery 20 A
*
max.
In case of 230 V 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 34Ah
batteries). 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: "Approximate backup time -
assumptions for calculations".
The power supply unit is placed in a metal enclosure (color RAL 9003) with space for 2x17Ah/12 V batteries and a
recorder. The enclosure construction is compliant with the requirements of the General Data Protection
Regulation GDPR (the possibility of installing two locks with different codes). 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.
*
See chart 1