User guide

172N TELEKOMUNIKACE a.s., www.2n.cz
®
Connection of External Power Supply
2N
®
Helios IP Audio Kit can be supplied either from an external 9–36 / 2 A DC V
source or directly from the LAN provided with the PoE 802.3af supporting network
elements.
External Power Supply
Connect the external 12 V power supply to the DC in terminals. Use safety low-voltage
voltage (SELV, 9–36 V) dimensioned for the minimum current consumption of 1.5 A
(Part No. 91341481E, e.g.) to make your device work correctly.
PoE Supply
2N
®
Helios IP Audio Kit is compatible with the PoE 802.3af technology (Class 0 –
12.95 W) and can be supplied directly from the LAN via compatible network elements.
If your LAN lacks such compatible elements, you can insert a PoE injector, Part
No. 91758100E, between your and the nearest network2N® Helios IP Audio Kit
element. Connect your to the LAN via the LAN1 interface to2N
®
Helios IP Audio Kit
supply it successfully.
Connection of LED Indicators
2N
®
Helios IP Audio Kit is equipped with three independent current LED control
outputs (LED1+, LED2+ and LED3 terminals). All of them are current outputs (20 mA±
, up to 12 V). You can connect the LEDs directly to the terminals of these outputs or
use LEDs with serial resistors. Mind the polarity while connecting the LEDs to make
your device work properly.
Caution
In case you feed your via PoE or from a2N
®
Helios IP Audio Kit
limited-power external power supply, monitor the power consumption of
the whole system. With regard to the PoE 802.3af capacities and
efficiency of the switched-mode power supplies in the device, the
maximum possible device input is approximately 12 W. An overload of the
PoE source usually results in PoE disconnection and, subsequently, 2N
®
restart.Helios IP Audio Kit
The consumption at relax (power amplifier2N
®
Helios IP Audio Kit
inactive, no load switched on LED1–3 and OUT1–2 outputs) is up to 2 W.
The maximum power amplifier consumption is determined by the current
loudspeaker volume level and impedance (up to 10 W for a 4 Ω
loudspeaker). The real consumption is typically lower and depends on the
characteristics of the signal to be amplified.
If you intend to connect a considerable load to the OUT1 and OUT2
outputs, make sure that the total input does not exceed the above
mentioned limit (12 W for PoE). If the PoE supply fails to provide sufficient
power for the specific application, use a more powerful external source to
make your device work perfectly.