122 A L P H A with Bluefin
Rack-Mounted AC PSU
A 2U rack-mounted power supply unit is
available to provide the DC power for the
modular Hydra I/O box. This holds up to
four identical AC plug-in PSU modules.
One module will provide power for a fully
populated modular Hydra I/O box, with
a second providing redundancy. Two
other modules could be fitted to power a
second unit.
The rack has separate AC power inputs
and DC outputs for each of the four
PSU’s. Any one PSU can be removed
from the rack without disturbing the
operation of the others in the rack.
Diode feeding allows supplies of the same
type to be parallelled together.
Mounting Instructions
The power supply rack should be mounted
in a horizontal position by means of
the side brackets, each of which has
two mounting holes. The rear mounting
brackets fix to the rear of the equipment
bay and should be used when no support
is provided under the rack assembly.
Extensions of the rack sides slot into
these rear supports, allowing the rack to
be removed without removing the support.
The rack should not be supported by front
flanges alone.
Cooling
The rack is fan cooled with fans mounted
in the front of each plug-in PSU. The
warm air is directed out of the rear of the
rack. To ensure proper cooling, there
must be a minimum clearance of two
inches (50mm) from the fans and rear
air outlets, and also any walls or other
surfaces.
<50°C (122°F) OFF OK
50°C to 55°C (122°F to 131°F)
SLOW OK
55°C to 60°C (131°F to 140°F)
FAST OK
60°C to 70°C (140°F to 158°F) FAST OVER TEMP
>70°C (158°F) FAST DISABLED
Modular Hydra I/O Box
(Fully Populated)
7U 19 483
12 300 35.2 16
Optional Rack Mounted PSU
(with 2 plug-in units)
2U 19 483
12 300 15.6 7.1
Optional Rack Mounted PSU
(with 4 plug-in units)
2U 19 483 12 300 25.3
11.5
Bulk PSU Rack Fan Noise
(dB SPL A-Weighted)
These measurements were taken on axis at
1 metre from the dominant noise source:
1 x 24V 200W PSU 24dBA
2 x 24V 200W PSU 27dBA
3 x 24V 200W PSU 29dBA
4 x 24V 200W PSU 30dBA
Input Power Connections
3-wire safety AC outlet sockets should be
located near the power system (number
as required). Each line cord will provide
AC power to one of the power supply
modules.
The AC line cord is the mains disconnect
for each module. The AC line cords should
have an IEC320 connector to plug into the
rear of the power system chassis.
Each line cord MUST be suitably rated
and FUSED (or have an equivalently rated
circuit breaker). The maximum inrush
current is 30 Amps. Fuses should be at
least 250V AC, T6.3A HRC rated to avoid
nuisance “blows”. Breakers should be at
least 6A , Type C.
Safety grounding is provided via ground
connections in the line cord entry
receptacles.
If in doubt, please consult Calrec’s
customer support team.
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