Copyright © 2009-2017 R. STAHL TRANBERG AS. All rights reserved. Page 12 of 27
Section 3.03
Functional description
Power supplies
The main switch operates both main and emergency supply. Left position – main supply, middle
position – off and right position – emergency supply.
Both power supplies are constantly monitored. If a power supply is missing, the alarm relay
activates and a red LED lights up. When the selected (by the main switch) power supply fails, an
audible alarm sounds in addition to visual alarm and alarm relay. To stop the audible alarm,
switch panel off or switch over to the alternate power supply.
Outgoing circuits
The TEF4730 series is delivered with 2x8, 2x12 or 2x16 outgoing circuits. Each circuit contains a
separate monitoring device. The circuits are controlled by a two pole rocker switch, left position –
main output, centre – off and right position – spare output.
Each circuit has a corresponding LED to show status. LED off – Circuit off. Steady light – Output is
on and circuit is OK. Flashing light – Output is on and a failure is present. Failure can be a broken
bulb, blown fuse etc. When a failure occur an audible alarm and the alarm relay activates. To
stop the alarm, correct failure or switch circuit off.
Each output is fused in both poles. The fuses are located in the outgoing terminal blocks.
Dimmer, test button, potential free alarm contact
Indicator LED’s for the outgoing circuits are dimmable. Dimmer knob is located at the bottom left
side. LED’s for power supplies are not dimmable.
Next to the dimmer knob, a push button named ‘test’ is located. This button tests the function of
indicator LED’s and buzzer. When pressed, all LED’s lights up and buzzer is sounding. Note: The
‘test’ button does not check the status or functionality of the circuits or connected navigation
lights.
The panel is equipped with a potential free change-over contact which activates on all alarms.
The alarm contact is connected to terminal No. 51, 52 and 53.
Section 3.04
Voltage compensation
In long cable lengths voltage can drop below lower limit for the navigation light to ensure light
output as required. To compensate for the voltage loss in cable, the TEF4730 have the possibility
to single out circuits and connect them to a higher voltage. This is done by using transformer with
multiple voltage output. Ref. ‘Section 2.08’.
This technique also allows using cables with smaller cross-section than typically for 24V supply.
TEF4730 is modified for voltage compensation by R. Stahl Tranberg A.S. R. Stahl Tranberg A.S.
can assist calculating voltage compensation.
