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PSBOC351225
7
3. Operating status indication.
3.1 LED indication
The PSU is equipped with 3 LEDs on the PCB board:
- red LED (Fig.2, element 1) normal status (AC power): permanently illuminated. AC power absence is
indicated by the AC diode going out.
Caution! LED indicates power absence if the outage lasts >10s.
- green LED (Fig.2, element 2) indicates DC power at the PSU output. Under normal status the diode is
permanently illuminated. In case of a short circuit or an overload, the diode is off.
- green LED (Fig.2, element 3) indicates battery voltage level. Under normal status (U
BAT
> 11,5V) the diode is
permanently illuminated. In case of decrease of battery voltage (U
BAT
< 11,5V) the diode is off.
3.2 Technical outputs
The PSU has indication outputs:
•
FAC - absence of AC supply output: - OC type output that indicates AC power loss. Under normal status,
with 230V AC supply, the output is connected to ground (L level – 0V). In case of power loss, the PSU will
switch the output into high impedance state hi-Z after approx. 10s.
•
FAC - absence of AC supply output: - relay output indicating the absence of AC supply. In case of power
loss, the PSU module will switch the relay contacts after approx. 10 seconds.
CAUTION! In Fig.2. the contact set in the potential-free status corresponds to a state with no AC
power (AC power failure).
•
FPS – technical output indicating absence of DC voltage at the PSU: OC type output indicating the
PSU failure. In normal state (during correct operation) the output is connected to ground (L level – 0V). In
case of absence of DC voltage at the output (e.g. short circuit), the output is switched into high impedance
state – hi-Z.
•
FLB – technical output indicating battery voltage: OC type output. Under normal status (U
BAT
> 11,5V)
the output is connected to ground (L level – 0V). In case of decrease of battery voltage (U
BAT
< 11,5V) the
output is switched into high impedance state – hi-Z.
Fig. 4. Electrical diagram of OC outputs.
4. Operation and use.
4.1 Overload or short circuit of the PSU module output
In case of an overload or a short circuit at the PSU output, the output voltage is automatically cut off. The
voltage is restored automatically after removing the failure (overload).
4.2 Battery-assisted operation.
In case of a main power outage, the device is immediately switched into a battery-assisted operation.
The PSU is equipped with the discharged battery disconnection system. During the
battery-assisted operation, reducing voltage below 9,5V at the battery terminals will cause
battery disconnection.
