Use hardware as supplied with washers (1-split, 1-flat) to connect
(+) to left side of the 50 V bus bar, and (-) to the right side.
2.6.1
Tap Transformers
The two power supplies in the control cabinet, the supply with
each slave controller in the PA cabinets, the supply in the exciter,
and the 50 volt power supplies should be tapped for the correct
line voltage. See the following drawings:
1. Wiring Diagram for Control cabinet
2. Wiring Diagram for Aural PA cabinet
3. Wiring Diagram for Visual PA cabinet
4. Power Supply Schematic for HX-1V exciter
5. Wiring Diagram for 50 Volt Power Supply
2.7
RF Output Coax
CAUTION
WHEN INSTALLING RF PLUMBING OR AIR SYSTEM WIRING, DO
NOT STEP ON THE CONNECTORS ON TOP OF THE CABINETS.
(Refer to RF Plumbing Layout drawing.)
Because almost every station is different, refer to the suggested
layout for information for location of hybrids, loads, couplers
etc. Install the directional couplers for each cabinet first, and
work from there out toward the loads and antenna. Be sure to
make any desired VSWR measurements of the RF plant before
making final connections to the cabinets.
2.8
Primary Wiring
(Refer to AC Power Distribution drawing.)
Three phase AC power wiring for each amplifier cabinet can be
installed through the hole provided for conduit directly above the
main contactor. Removal of the safety shield over the contactor
is required, and the shield must be replaced after completing the
AC power wiring in each cabinet.
All cabinets must be phased identically; that is, each phase
connects to the same point in each cabinet, and each 50 volt
power supply is connected like the others. For example, at
PS1-TB-1,4 connects to phase A on all supplies, etc. All logic
must be powered from the same phase.
The power for the control cabinet is fed through the conduit hole
in the left rear top of the cabinet. The three phase power runs to
the terminal block in the center bottom of cabinet. Again, the
safety shield must be removed before installation, and replaced
after completion.
2.9
Inter-cabinet Wiring
(Refer to the Cabinet Interconnect Drawing)
A cable tray (not furnished) should be installed along the top of
the transmitter for cabinet interconnecting. Install the control and
monitor cables in this tray. It may be plastic or metal, and attached
to the top of the cabinet with screws or bolts.
Run the cables from the control cabinet through the cable tray to
each PA cabinet. On the monitor bus cable (flat ribbon cable), be
sure to insert pin 1 of the cable into socket 1 of the jack. The cable
terminator must be installed in the last PA cabinet, again paying
close attention to pin numbers.
The RF sample lines may be installed in the cable tray as well.
Make sure each pair of RF sample lines is of equal length. The
line length is not critical but should be kept reasonably short.
Directional couplers are set to level with maximum length of 50
feet for RG58/U coax. Make forward and reflected sample cable
pairs from the same roll of coax if possible to keep insertion
losses equal. If the transmitter architecture utilizes two drive
paths, the cables used for Visual Drive A & B samples should be
of equal length as well.
2.10
Input Signal Wiring
Video, aural, and subcarrier input signal lines are connected from
signal sources to signal inputs on the I/O panel as required. Video
inputs are terminated into 75 Ohms. Mono aural input is a
standard XLR connector with pin 1 grounded. Aural wideband
inputs can be jumper selected to terminate 75 or 1000 Ohms.
2.11
Interlocks and Interfaces
External and failsafe interlocks are connected to TB1 located
near the bottom of the I/O panel in the back of the control cabinet.
Refer to the Cabinet Interconnect drawing.
2.11.1
External Interlock: TB1-1,2
When open, the external interlock prevents the transmitter from
being started up. For units with Rev. E or earlier main control
boards, it will turn the transmitter off if opened during operation,
and a manual ON command (either local or remote) is required
to restart the transmitter.
On rev F. or later main controller boards, the external interlock
is user selectable by J24. It can either shut the transmitter off (as
an OFF command) when the interlock is opened, or temporarily
hold the transmitter off while the interlock is open.
J24 jumper pins 1-2 for automatic return to ON when in-
terlock is restored.
J24 jumper pins 2-3 for transmitter off, manual restart
(“ON” command) required.
The external contact closure or other device must sink 50 mi-
croamps to less than 0.5 volts. Open circuit voltage at TB1-2 is
+5 V, and TB1-1 is ground.
2-4
888-2365-001
Rev. C: 8-24-2000
WARNING: Disconnect primary power prior to servicing.
Summary of Contents for Platinum Series
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