1-4
888-2621-001
12/5/07
WARNING: Disconnect primary power prior to servicing.
Section I Operator Guide
Z3-48HD+
Several cables will be secured inside the cabinets that need routed to the other cabinets
A hole located in each cabinet is provided for cable routing between cabinets. If a hole
cap is still in place, remove cap from both cabinets for interconnecting cables. Refer to
the wiring diagrams in the System Drawing Package for wire destinations. Each wire
will be marked with a wire or cable number located near the end of each wire. After
routing, cables may be permanently attached to other existing cabling. Keep in mind
some units are mounted on slides and cables are long enough to slide out with the unit
for continuous operation.
The exciter interconnect consists of various cables. Not all of these cables are necessary
in some applications. Depending on how many exciters and what type of IBOC system,
some cables may not be needed. See drawings in the Z16 manual drawing package for
further information.
The combiners and loads are usually placed where specified by the layout diagram in
the System Drawing Package. Placement of Directional Coupler assemblies are also
specified by the layout diagram. A provided coax cable should be connected between
the System Controllers and three coupler ports each; the forward power, reflected
power, and the reject load forward power.
The reject load’s (if provided) interlock cables should be connected. Connections for
addition station interlocks may be provided depending on the configuration of the
system. Refer to the System Drawing Package for further information.
AC connections for the transmitters are located near the top in the back left side of each
cabinet. See the Z16 manual for further information. One AC connection must be made
for the Z3-48HD+ exciter(s). This TB7 terminal block is located inside the AC input
compartment of transmitter cabinet C. This input should be on a separate AC feed in
case this transmitter’s breaker is off, the exciters can operate the remaining operating
transmitters at a reduced power level. Another AC feed must be connected to the
controller rack (if provided) or each piece of equipment if a rack is not provided. This
AC feed should again be on a separate AC feed from the transmitter in case one
transmitter breaker is off. Each Harris-made piece of equipment to be placed in an
existing rack can be operated at 120 or 240 VAC depending on the AC input card
position.
Connect transmission line between the transmitters and the combiners per the layout
supplied in the System Drawing Package. Any unequal change to the transmission line
length from transmitter to combiner will have to be adjusted for in the drive circuit.
Combiner input phasing is important for proper operation. Confirm the ports of the
4.77dB hybrid are aligned according to the markings on the combiner. This combiner is
not symmetrical so it must be connected properly. Also connect transmission line to the
reject loads. Placement of the loads and length of line to the loads is not critical. Only
transmission line for the typical layout is supplied with the system unless otherwise
specified with the order.
Summary of Contents for Z3-48HD+
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