www.pulsar.pl
EN54-5A17
RED POWER
7
4. Technical description.
4.1. General description.
The buffer power supply has been designed for an uninterrupted supply of fire alarm systems, smoke
and heat control systems, fire protection equipment and fire automatics requiring stabilized voltage of 24V DC (
±
15%). The PSU is fitted with two independently protected outputs AUX1 and AUX2, which supply voltage of
27.6 V
DC
with a total output current
:
Continuous operation
Output current Imax a=4A
Instantaneous operation
Output current Imax b=5A
In case of power loss, the PSU switches to battery power, providing uninterruptible power supply. The
PSU is enclosed in a metal casing (RAL 3001 - red) with battery housing for two 17Ah/12V batteries. The PSU
works with maintenance-free lead acid batteries made with AGM technology or gel technology.
4.2. Block diagram
The PSU has been manufactured based on a high-efficiency system of DC/DC converter. Applied
microprocessor circuit is responsible for the full diagnostics of the PSU parameters and batteries. The figure below
shows a flowchart of the power supply, along with selected functional blocks which are essential for the proper
functioning of the unit.
Fig. 1. PSU block diagram.
