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PSBOC1002435
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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.
- 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.
- relay output. In case of a failure, the contacts of the relay change over.
CAUTION! In the Fig.2. the set of contacts shows a potential-free status of the relay which
corresponds to a state with no DC power (PSU failure).
•
FLB – technical output indicating battery voltage:
- OC type output. Under normal status (U
BAT
> 23V) the output is connected to ground (L level – 0V). In
case of decrease of battery voltage (U
BAT
< 23V) the output is switched into high impedance state – hi-Z.
- relay output. In case of a battery voltage drop U
BAT
< 23V, the contacts of the relay change over.
CAUTION! In the Fig.2. the set of contacts shows a potential-free status of the relay which
corresponds to a state with low battery level (U
BAT
<23V).
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 19V at the battery terminals will cause
battery disconnection.
4.3 Maintenance
Any and all maintenance operations may be performed following the disconnection of the PSU from the
power supply network. The PSU does not require performing any specific maintenance measures. However, in
case of significant dust ingress, it is recommended to clean the PSU with compressed air.