Calrec ARGO, Installation & Technical Manual

Page: 83 / 92

83
Power
Modular I/O frames are fitted with dual power supplies and have 2 IEC mains input connectors.
Units will be fully functional on one PSU, however both should be fed where possible from
separate sources to provide redundancy against both PSU failure and external power loss.
The operating AC supply voltage is 100V–240V +/-10%.
The peak inrush current is limited (cold start). This reduces the chance of a nuisance trip or fuse
blow from power up. The RMS quiescent and peak inrush current figures are dependant upon
the quantity and type of I/O cards fitted. Please refer to the AoIP I/O manual for more details on
modular I/O.
Heat Output & Efficiency
The Heat output from modular I/O units depends upon the quantity and card types fitted, please
refer to the AoIP I/O manual for more detail on modular I/O.
Cooling
Fans mounted to the PSUs at the back of the core draw air through the PSUs and the core itself.
Air is drawn up through the base of the core which is recessed to allow air to enter through the
side, and for the units to be mounted with no clearance above or below. The bottom of the sides
of the modular I/O box should be unobstructed with at least 50mm (2') clearance to allow airflow.
Modular I/O units may be mounted in an open bay providing the ambient air temperature is within
limits (see below). The units may also be housed in air conditioned bays.
Operating Ambient Air
Temperature
0°C - 35°C
Relative Humidity 5% – 80% Non-condensing
MODULAR I/O
Power
All fixed format I/O units have two IEC AC power inlets and are fitted with dual power supplies.
Units will be fully functional on one PSU, however both should be fed where possible from
separate sources to provide redundancy against both PSU failure and external power loss.
The operating AC supply voltage is 100V–240V +/-10%.
The peak inrush current is limited (cold start). Figures are available for all units. This reduces the
chance of a nuisance trip or fuse blow from power up. The RMS quiescent current figures are
available for all types of I/O box.
Power Factor
All fixed format I/O units require less than 75W of input power. The internal power supplies fitted
have passive filtering (as opposed to active power factor correction) to reduce the harmonics to
within the limits of the standard EN61000-3-2. At the time of writing the standard does not apply
to equipment <75W. If the lower limit is ever reduced the units will be compliant and as such are
future proof.
Heat Output & Efficiency
The Heat output from fixed format I/O units depends on the supply voltage and loading.
Typically it is 0.55 times the RMS VA (Volts x Amperes) at 230V & 0.7 times the RMS VA at 115V.
Heat output figures are available for all types of I/O box.
The low power PSU efficiency is again dependant on supply voltage and loading, generally >70%.
Cooling
All fixed format I/O units of 2U or greater are cooled under control with fan assistance.
Operation is not dependant on the fan; it is there to extend the operating life of the unit.
There is an 80mm low power, low speed and low noise fan mounted to the right hand side panel
of each unit venting air. Fan speed is monitored and System Status warnings generated if fans
slow or fail. Air is drawn in through the left hand side panel.
The side panels of all fixed format I/O units should be unobstructed with at least 50mm (2')
clearance to allow airflow. No clearance is required above or below the unit.
I/O units may be mounted in an open bay providing the ambient air temperature is within limits
(see below). The units may also be housed in any air conditioned bay.
Acoustic Noise
<27 dB SPL (A-weighted, 1m from front).
Operating Ambient Air
Temperature
0°C - 35°C
Relative Humidity
5% – 80% Non-condensing
FIXED FORMAT I/O