Grass Valley NV8500 Series v.3.5 - Manual (Page 137)

121
NV8500 Series
User’s Guide
Overview of Power
The PS8100 and the PS8300 accept a wide range of AC input voltages and produce five +48 VDC
outputs, called branches. Each power supply module has its own AC main cable. The power
supply automatically senses the AC input voltage range (90–130 and 180–250 VAC) and adjusts
to maintain a constant DC output. No “manual” voltage selection is required.
Fig. 8-1: Power Supply Architecture
The five regulated outputs are directed to various sections in the router where on-board regula-
tors produce the DC voltages required by the local circuits. Each branch output powers one of
the five green LEDs and output test points located on the front of the power supply module.
Under normal operation, all five LEDs are lit. (See
Indicator LEDs on page 193.)
Power supply module cooling is provided by a single low-speed fan located along the front
edge of each module, which draws a small quantity of air across internal heat sinks.
(The PS8100, PS8300, and the NV8300 frame have no serviceable fuses.)
Power Supply Distribution
Each power supply module produces five +48 VDC branches. The branches are distributed to
various modules of the router frame: input, output, control, monitor, and crosspoint cards.
The NV8140 and the NV8144 have one primary power supply module and one redundant power
supply module. One is active and the other is standby. The 5 branches distribute power to all
input, output, control, monitor and crosspoint modules.
The NV8280, NV8576, and NV8576-Plus frames require more than one PS8300 power supply
module. Therefore, each power supply module supplies power to only a section of the router
frame. (If power from a PS8300 is interrupted, only that section of the router is affected. You can
determine which power supply failed (or failed over to the standby supply) by seeing which
cards are not receiving power.
NV8576-Plus,
expanded (two
frames) Coax 6,800 — 8 required,
8 redundant 4
Fiber optic 8,500 — 8 required,
8 redundant 4
Hybrid 10,800 — 8 required,
8 redundant 4
Router
Type of I/O
Cards
Installed
Required
Wattage PS8100 Mod-
ules PS8300 Mod-
ules
NV8300
Frames
Required
Power Sense
and Limiting
AC Input, Fuse,
Rectifiers, and Filter
Power Factor
Correction
+48VDC
Regulators (×5)
+48VDC
Out (×5)
90–130VAC or
180–250VAC In
Power Supply
Brances (5)