LZB39 buffer power supply

The power supply is mounted in a metal cage painted light grey with powder varnish. The cage is adjusted to be mounted on a wall. The construction of the cage allows to dismount the front part of it (without tools, after releasing special latches) and thus to have a quick access to the accumulator. The power supply does not have an off-switch – the disconnection of electricity is possible through the disconnection of the connector available after taking the cage off.
 

LZB39 is a stabilized transformer power supply with a high rate of voltage stabilization. It is equipped with an electronic safety device protecting from short-circuit and overload. Installed fuses protect a transformer's primary winding and an accumulator's connection circuit against overload or reverse connection. Voltage charging of an accumulator covers the phase of charging and maintenance. Voltage of an accumulator's charging is corrected by means of temperature according to the recommendations of accumulator producers. At breakdown work (lack of voltage 230V AC) the process of an accumulator's discharging stops at 10.5V – at this voltage electronic circuit disconnects an accumulator protecting it against destruction.
In the basic version a power supply signalizes working state by means of LEDs:
“230V AC” LED signalizes the presence of 230V AC input voltage
“12V DC” LED signalizes the presence of 12V DC output voltage

In S version (LZB39-1202S) a power supply is additionally equipped with sound and relay system  which signalize working state of a power supply:
- short and interrupted sound signal signalizes breakdown work (lack of 230V AC net) at a big energy reserve in an accumulator.
- uninterrupted sound signal signalizes breakdown work in its final phase of an accumulator's discharging process – after several minutes of uninterrupted sound signal an accumulator is disconnected.

- long and discontinuous sound signal signalizes a breakdown in an accumulator's circuit (a burned fuse, a disconnected accumulator). This signal also accompanies the introductory phase of charging an almost completely discharged accumulator – after several minutes of charging  the signal should subside automatically.
- contacts of a signalling relay are open in the state of breakdown work or a breakdown in an accumulator's circuit.