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EN54-2A17LCD
RED POWER
24
When installing the fuse module in the PSU, power supply current consumption, used for the
calculation of standby time (see section 8.8), should be taken into account.
Depending on the version, fuse module allows to connect 4 or 8 receivers to the PSU. Output state is indicated by
green LEDs.
Blown fuse is indicated as follows:
- corresponding LED turns off: L1 for AUX1 etc.
- red LED on
- PSU technical output on (Hi-Z state)
- switching PSU relay output into voltage free status (contacts as shown in the Fig. 21).
In addition, blown fuse signal is transmitted to the input of collective failure EXTi (ALARM) and saved in the
internal memory of PSU.
The PSU’s relay output can also be used for remote control, including external optical indication.
6.9. Overvoltage protection of the PSU output OVP.
In case of voltage exceeding 30,5V
±0.5V at the switching regulator’s output, the system cuts off
the power at the outputs to protect the battery and the receivers from damage. The outputs will be battery-
powered. The activation of the protection system is indicated by the OVP
yellow
LED on the PCB board, and the
PSU FLT and ALARM outputs.
6.10. PSU overload.
The PSU is fitted with the LED OVL (overload) on the PCB, informing about output overload. If the
nominal current of the PSU is exceeded, the led turns on and the microprocessor starts a specially
implemented procedure. Depending on time and overload level, microprocessor may disconnect the AUX1 and
AUX2 outputs and switch into the battery-assisted operation. Restart will occur after 1 minute.
PSU overload is indicated by the PSU FLT and ALARM technical outputs.
6.11. Indication of exceeding the „Imax a” current.
Exceeding the "Imax a" output current during the power supply operation is indicated by the
microprocessor using the LED OVL light (overload) on the PCB after 30 seconds. In addition, the main screen of
the LCD will display a blinking light:
I
MAX_A
!
Information about exceeding the
„Imax a” current is stored in the history of events. Battery charge current is
limited in order to protect the power supply against overload.
6.12. Short-circuit of the PSU output.
In case of short-circuit of the AUX1 or AUX2 output, one of the fuses - F
AUX1
or F
AUX2
– becomes
permanently blown. The restoration of the voltage at the output requires the replacement of the fuse .
