Calrec SUMMA, Installation Manual

Page: 88 / 96

88 SUMMA
Networked Audio Production System
Specifications
HYDRA2 FIXED FORMAT I/O
Fixed Format I/O
Power
All fixed format Hydra2 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 100 V - 240 V +/-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 specified on the rating label for all types of I/O box and are available within the individual
data sheets in the Hydra2 Installation Manual.
Power Factor
All fixed format Hydra2 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 and Efficiency
The Heat output from fixed format Hydra2 I/O units depends on the supply voltage and
loading. Typically it is 0.55 times the RMS VA (Volts x Amperes) at 230V and 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 Hydra2 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 are generated if
fans slow or fail. Air is drawn in through the left hand side panel.
1U Hydra2 I/O boxes do not require fan assistance having sufficient surface area to radiate
heat adequately.
The side panels of all fixed format Hydra2 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 - 40°C
Relative Humidity
5% - 80% Non-Condensing