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AWZ333
3
1.2 Principle of operation.
AWZ 333 is a stabilized transformer PSU with high factor of voltage stabilization. Mains supply ~230V is
reduced by a transformer and then rectified by the system of rectifiers and a low pass filter. DC output voltage is
gained in the linear regulator and it is adjusted according to the PSU operation type (charging phase and battery
maintenance). In case of power decay, a battery back-up is activated instantaneously. During battery-assisted
operation the PSU controls the battery voltage when it reaches 10 V. The electrical system disconnects the battery
and protects it from damage. After restoration of the ~230V mains supply, the PSU automatically charges up and
preserves the battery.
PSU operating status is indicated by LEDs on the faceplate.
red LED – failure indication (additionally, failure state can be indicated by acoustic indicator)
green LED – AC/DC supply indication
Remote control of the PSU is by means of three technical outputs:
BS – main supply status control
AW - failure status control
TAMPER – unwanted enclosure opening control
1.3 Block diagram. (Fig. 1)
Fig. 1. Block diagram of the PSU.
1.4 Description of PSU components and connectors.
Table 1. Elements of the PSU pcb (see Fig 2).
Element nr
Description
[1]
acoustic indication - BUZZER
[2]
ZB
pin for acoustic indication
acoustic indication off
acoustic indication on
Caption:
jumper on,
jumper off
[3]
STOP
button (PSU disconnection from the battery)
[4]
START
button (launching the PSU from a battery)
