Nautel NX100, Руководство по предварительной установке

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NX100 Pre-installation Manual Planning control/monitor connections
Page 8-4 Issue 3.2 2017-03-31
External PDM inhibit
You can connect an external PDM inhibit to terminal block TB1 (terminals 5 through 8) of the
control/interface PWB (A11A1), located on the exciter panel behind the front door. This connection
allows you to configure an external PDM inhibit circuit that provides an emergency RF inhibit
control 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 ).
Single Ended Input (Internal dc supply).
If you are using the transmitter's 15 V as the current
source for the PDM inhibit circuit, install a shorting jumper between the
+15V
terminal (TB1-5) and
the + terminal (TB1-6) and connect your external PDM inhibit circuit between the
GND
terminal
(TB1-8) and the – terminal (TB1-7).
The external PDM inhibit circuit must present a short circuit (low impedance) between TB1-8 and
TB1-7 when the RF output requires inhibition. It must present an open circuit for normal operation.
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 external PDM inhibit circuit, connect
the supply’s positive output to the
+ terminal (TB1-6) and the supply’s ground (negative) output to
the – terminal (TB1-7), via the external PDM inhibit circuit. No shorting jumper is required.
The external PDM inhibit circuit must present a short circuit (low impedance) between TB1-8 and
TB1-7 when the RF output requires inhibition. It must present an open circuit for normal operation.