www.pulsar.pl PSBSOF10A12
9
PSU
– output indicating PSU failure
.
The output indicates PSU failure. Under normal status (correct operation) the output is shorted to ground
GND. If there is no DC voltage at the output (eg short circuit), the output is switched into hi-Z high
impedance state.
PSU failure can be caused by the following events:
- Short circuit at the output
- Output overload
- DC/DC voltage converter failure
- Under voltage protection activation
LoB
– output indicating low battery voltage.
The output indicates low battery voltage. Under normal status (U
BAT
> 11,5V) the output is shorted to
ground GND, when the battery voltage drops too low (U
BAT
< 11,5V) the output is switched into hi-Z high
impedance state.
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.
The power supply technical outputs are open collector (OC) type, as shown schematically below.
Fig. 4. Electrical diagram of the OC technical outputs.
3.4 Relay technical outputs.
If the OC type outputs are not sufficient to control the unit, it is possible to use the MPSBS relay module
changing technical outputs of the OC type to relay type.
Fig. 5. The diagram of connecting the MPSBS module.
4. Service and operation.
4.1 Overload or short-circuit of the power supply output (SCP activation).
The AUX output of the PSU is protected against short-circuit by
PTC polymer fuse. If the power supply load
current exceeds Imax. (110% ÷ 150% @ 25°C of the PSU power), automatic disconnection of the output voltage,
indicated by switching off the green LED, takes place. To restore the voltage at the output, disconnect the load
from the power supply output for approximately 1 minute.
In case of a short-circuit at the AUX, BAT output or reverse battery connection, the F
BAT
fuse in the battery
circuit becomes permanently damaged. The voltage restoration at the BAT output requires fuse replacement.
