10
•
TAMPER - output indicates opening the power-supply unit
:
output as volt-free contacts which indicate
power-supply unit door status and fastening to the ground: NC unit opened and/or wrongly fastened (e.g.
unit unconnected with the ground): NO.
4. Service and operation.
4.1. Overload of short-circuit to the power-supply output.
The output circuit has an electronic current protection. If permissible value of the I
max
output current is
exceeded, the power-supply unit output voltage is disconnected and this is indicated by the O1, O2, O3 and AUX
diodes going off. The voltage is restored automatically, when the receivers are disconnected from the output.
Additionally, the AUX1, AUX2, AUX3 outputs of the power-supply unit are independently protected, using
the PTC polymer fuses. If the output is loaded with the current that exceeds 2.5A, the output voltage is
automatically disconnected, which is indicated by the O1, O2 or O3 green diode going off. The restoration of the
voltage at the output requires the disconnecting output load for the period of at least one minute.
In the case of the short-circuit to the AUX, BAT output, (load 200% ÷ 250% of the PSU power) or incorrect
connection of the battery, the fuse F1 in the battery circuit becomes permanently damaged. The restoration of the
voltage at the BAT output requires the replacement of the fuse.
4.2. Battery operation.
In the case of power failure, in the unit will instantly switch to the battery assisted operation.
In order to activate the operation of the PSU from the battery itself, connect the BAT connectors in accordance with
the indications: +BAT red to ‘plus’ and, -BAT black to 'minus’ of the battery and press and keep depressed for five
seconds the START pushbutton on the equipment board.
The PSU is equipped with the discharged battery disconnection system (UPV); the configuration of
functions through the jumper ‘J’. The battery protection is on if the jumper ‘J’ is removed.
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 the
case of significant dust rate, its interior is recommended to be cleaned with compressed air. In the case of fuse
replacement, only the substitutes in conformity to the original ones are allowed.
