Grass Valley Trinix NXT v.3.3.1 - Manual (Page 56)

56 Trinix NXT — Installation and Service Manual
Section 2 — Planning Guide
The Asymmetrical Trinix router provides two isolated DC input power
connectors only. An external AC to DC power supply provides power for
these connectors or a customer may provide a 48 VDC power source.
CAUTION External 48 VDC Inputs are not fused. Customers must ensure that the 48
VDC power sources, which they must provide, are properly fused.
An external power supply rack is available that will accommodate up to
four redundant, load sharing power supply modules for each power con-
nector on the frame. The 128x256 and 256x512 frames each have two power
connectors. The back panel of the power supply rack provides a separate
AC connector for each power supply. Each power supply cord should be
plugged into a separate dedicated (20A AC low line and 10A AC high line)
power circuit.
Note Grass Valley strongly recommends, whenever possible, using the AC high
line to reduce line currents and heat within the power supplies.
The Trinix 512x1024 frames have a minimum of two PS trays with four
power modules in each tray. Every power supply module that is used in an
Asymmetrical frame has its own separate IEC AC power cord. The Primary
power supply trays connect to the frame in the rear of the chassis on the A1
and A2 correctors. Secondary power supplies may be added to the B1 and
B2 connectors using an additional pair of power supply trays (See Trinix
Asymmetrical Power Supply Configurations
on page 227 , for more informa-
tion).
(See the DC Power Input section of the Electrical Specifications, for the Asym-
metrical Trinix power requirements.)
Cooling System
The Trinix router uses fan modules (FM-33000) for cooling the main
chamber of the frame. A fan module consists of two blower-type fans that
are housed in a mechanical assembly. The 128 x 128 frame uses two mod-
ules, the 256 x 256 frame uses three, and the 512 uses six. The 128x256 frame
uses three fan modules, and the 256x512 frame uses seven fan modules. The
fan modules are front-loading and can be hot-swapped.
Note The door on the front of all Trinix frames should be closed when the router is
in use.
Airflow openings for the 128 frame are shown in Figure 19 . Air is taken in
from the sides of the frame (primarily the left side), where the air is drawn
across the Input and Output boards, past the matrix board, and up to the
top rear of the frame where it is expelled from the router. A small amount
of air is drawn from the right side of the frame as well to help cool the
matrix boards. A
Front-Air Vent is provided as an additional router-cooling
option. This option is described on page 429 .