3170-avs.ib.rev5.doc
page 13 of 16
16/10/2007
Installation in frame or chassis:
See details in separate manual for selected frame type.
Before installing in frame, make any required link changes as detailed in the
Configuration
section.
CPS-3050 -- Local control:
All switchers are sold with a plain front panel with DC power LED and printed with the switcher type number and
IRT logo. The CPS-3050 provides the necessary components to add control buttons and tally to the front panel.
Before fitting the CPS-3050, the original front panel and LD 1, LED DC indicator, must be removed.
The CPS-3050 PCB should then be pressed carefully into place making sure that the pins on the CPS-3050 plug
mate correctly with the socket on the main module PCB.
The front plate is then fitted using the screws and spacers provided.
For local switching, to take effect link LK 3 must be placed in the “A” position. See
Configuration
for details.
TPS-3010 -- Local tally panel:
All switchers are sold with a plain front panel with DC power LED and printed with the switcher type number and
IRT logo.
The TPS-3010 provides the necessary components to add tally LED indicators to the front panel. This is desirable
when switchers are controlled only by remote connections that are distant from the switcher. This panel is especially
useful when switchers are controlled via the CDC-3060 controller from a remote location using RS232 connections.
The TPS-3010 provides confidence that a slave switcher has responded to the master command and can therefore
greatly assist in finding faults in inter-module wiring.
Before fitting the TPS-3010, the original front panel and LD 1, LED DC indicator, must be removed.
The TPS-3010 PCB should then be pressed carefully into place making sure that the pins on the TPS-3010 plug
mate correctly with the socket on the main module PCB.
The front plate is then fitted using the screws and spacers provided.
Connections:
Video:
The incoming video signal on each of inputs 1 - 5 is connected to a BNC connector on the rear assembly. These
terminals are terminated either via a termination resistor (R 1 to R 4) or via other equipment connected to the
output.
The switching arrangement of the relay contacts ensures that one input is always connected to the output and so
only four termination resistors are required. The fifth termination is the output load.
For 50 Ohm sources these resistors should be changed to 50 Ohms and the connected output load should also be
50 Ohms.
For other signals the termination impedance may be change to suit in a similar fashion. It is recommended that the
input terminations not be open circuited. For high impedance circuits the resistors should be changed to no greater
than 10 K
Ω
to prevent excessive noise.
It should be noted that during relay switching a discontinuity in termination will occur, which can cause a "glitch"
in the output signal.
It should also be noted that the signal is directly coupled through the relays and so will pass any DC content present.
Care should be taken to ensure that any DC present on the signal does not exceed the contact rating of the relays.
In the event of power loss all relays revert to the power off status shown on the schematic, with input 1 connected to
the output.