Nautel NX100, Руководство по предварительной установке

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NX100 Pre-installation Manual Planning control/monitor connections
Page 8-2 Issue 3.2 2017-03-31
External system interlock
You can connect an external system interlock to terminal block TB1 (terminals 1 through 4) of the
control/interface PWB (A11A1), located on the exciter panel behind the front door. This connection
allows you to configure an external system interlock circuit for the NX100. This circuit can be
configured as single-ended or differential, using user-provided shorting jumpers on terminal block
TB1 (see
Figure 8.1 on page 8-3 ).
Single Ended Input (Internal dc supply).
If you are using the transmitter's 15 V as the current
source for the system interlock circuit, install a shorting jumper between the
+15V
terminal (TB1-1)
and the + terminal (TB1-2) and connect your system interlock circuit between the
GND
terminal
(TB1-4) and the – terminal (TB1-3).
The system interlock circuit must present a short circuit (low impedance) between TB1-4 and TB1-3
when the interlock circuit is intact and it is safe to enable the RF output. It must present an open
circuit when any external interlock switch is activated and the RF output requires inhibition.
Differential Input (External dc supply).
If you are using an external dc supply (capable of
providing between 12 V and 25 V) as the current source for the system interlock circuit, connect the
supply’s positive output to the
+ terminal (TB1-2) and the supply’s ground (negative) output to the –
terminal (TB1-3), via the system interlock circuit. No shorting jumper is required.
The system interlock circuit must present a short circuit (low impedance) between the external
supply’s ground (negative) output and TB1-3 when the interlock circuit is intact and it is safe to
enable the RF output. It must present an open circuit when any external interlock switch is activated
and the RF output requires inhibition.
You can install any number of serial interlock switches provided the above conditions are met. If you
are not using an external system interlock circuit, connect user-provided jumpers between TB1-1 and
TB1-2 and between TB1-3 and TB1-4.