Nautel NX200, Installation And Operation Manual

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Page 2-58
NX200 Main-Standby Transmitter System Instruction Manual
Issue 0.3 Section 2 Preparation for Use and Installation
(f) Route interconnecting cable W1 (228-2117) between the control/monitor assembly
(W1P1 end) and the 4-port switch (W1P2 end). Mate W1P1 to 25-pin D-sub connector J1
on the rear of the assembly, using a clearance hole in the top of the host cabinet for
cable access. Mate W1P2 to K1J1 of the 4-port switch, using a clearance hole in the side
of the switch for cable access. Temporarily remove the access cover to allow connector
mating. See Figure 2-25 as a guide.
(g) Locate the wiring (from kit) that was provided to make interlock connections to the rear of
the control/monitor assembly. See Figure 2-26 for a rear view of the control/monitor
assembly and Figures 2-27 and 2-28 for electrical schematics that shows the interlock
connections. Connections are made to terminal blocks TB1 through TB3 on the rear of
the control/monitor assembly. The terminals accept wire sizes between 12 and 24 AWG.
Route cables neatly and connect as follows:
NOTE
When it is safe to produce an RF output, an interlock circuit must provide a short (low
impedance). When it is not safe to produce an RF output (one or more of the external interlock
switches have been activated), the circuit must provide an open. Any number of serial interlock
switches may be installed, provided they present an open circuit if any interlock switch is
activated.
If the RF toggle switch on the control/monitor assembly's front panel (see Figure 3) is set to
INHIBIT, all interlock circuits will be open and RF power for the entire transmitter system will
be inhibited.

SYSTEM INTERLOCK
: Provides an interlock for the entire transmitter system. If the
system interlock is open, both transmitters are interlocked off. If used, install a suitable
length of shielded cable between terminals TB2-3 (core) and TB2-4 (shield) of the
control/monitor assembly and the external system interlock circuit. This connection
allows you to connect an external safety interlock circuit that provides an emergency
RF inhibit control for the transmitter system. If the system interlock is not used, install
a shorting jumper between TB2-3 and TB2-4.
WARNING
If a jumper is placed between the SYSTEM INTERLOCK terminals (TB2-3 and TB2-4),
safety features provided by the external interlocks will be disabled. A fail-safe method of
alerting personnel to this fact should be implemented. Voltages that are dangerous to life
will be present on RF output stages and the antenna system if a transmitter is turned on.

CUSTOMER INTERLOCK
: Provides an additional option for the customer to connect
in series with the system interlock circuit. As desired, install a suitable length of
shielded cable between terminals TB2-5 (core) and TB2-6 (shield) of the
control/monitor assembly and the customer interlock circuit. This connection allows
you to connect an optional safety interlock circuit that provides an emergency RF
inhibit control for the transmitter system. If it is not used, it must be shorted by a
jumper to keep the system interlock circuit intact.