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AWZ637
8
3.2 Technical outputs
The PSU has indication outputs:
EPS - absence of AC supply output
:
- OC type output that indicates AC power loss. Under normal status, with 230 V 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).
PSU
– 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).
LoB
– technical output indicating battery voltage
:
- OC type output. Under normal status (U
BAT
> 11,5 V) the output is connected to ground (L level
– 0V). In case
of decrease of battery voltage (U
BAT
< 11,5 V) the output is switched into high impedance state
– hi-Z.
- relay output. In case of a battery voltage drop U
BAT
< 11,5 V, the contacts of the relay change over.
The power supply unit does not feature a battery detection function. In the case of no battery or non battery
connected, the output is in the normal mode.
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
<11,5 V).
Fig. 4. Electrical diagram of OC outputs.
4. Operation and use.
4.1 Overload or short circuit of the PSU output (SCP on)
In case of overload, the output voltage is automatically shut off, and so is the LED indicator. The restoration
of the voltage takes place immediately after the failure (overload) is over.
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 9,5 V at the battery terminals will cause
battery disconnection.
