102 HYDRA2
Installation Manual
Specification
OPERATIONAL SPECIFICATION
FIGURE 1 - HYDRA2 FIXED FORMAT SPECIFICATIONS
Powering
The 1U, 2U, 3U and 4U Racks have two AC power inlets each powering an internal PSU.
Although the racks will operate with one inlet supply we recommend both inlets are powered.
This will ensure continued operation should a PSU or AC source fail.
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 rack.
Power Factor
All rack units have 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 EN6100032. 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 the racks 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. The
heat output figures are available for all types of I/O racks.
The low power PSU efficiency again is dependant on supply voltage and loading, generally
>70%.
Cooling
The 2U, 3U & 4U racks keep their operating temperature 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 in the right side of the
racks from front. The fan is speed monitored so if it slows down or stops a warning is given.
The air intake is at the left side of the racks viewed from front and the air outtake on the
right. At least 50mm (2”) clearance must be maintained for these vents. The 1U I/O racks
have sufficient surface area to radiate the heat out so no fan is required. Any racks may be
mounted in an open bay providing the ambient air temperature is within limits (see below).
The racks may also be housed in any air conditioned bay.
Operating Ambient Air Temperature
0°C 40°C
Relative Humidity
5% – 90% Noncondensing
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