Nautel NX100 Preinstallation Manual

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Nautel NX100 Preinstallation Manual Manual pdf 71 page image

NX100 Pre-installation Manual Planning control/monitor connectionsPage 8-2 Issue 3.2 2017-03-31External system interlockYou can connect an external system interlock to terminal block TB1 (terminals 1 through 4) of thecontrol/interface PWB (A11A1), located on the exciter panel behind the front door. This connectionallows you to configure an external system interlock circuit for the NX100. This circuit can beconfigured as single-ended or differential, using user-provided shorting jumpers on terminal blockTB1 (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 currentsource 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 TB1-3when the interlock circuit is intact and it is safe to enable the RF output. It must present an opencircuit 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 ofproviding between 12 V and 25 V) as the current source for the system interlock circuit, connect thesupply’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 externalsupply’s ground (negative) output and TB1-3 when the interlock circuit is intact and it is safe toenable the RF output. It must present an open circuit when any external interlock switch is activatedand the RF output requires inhibition.You can install any number of serial interlock switches provided the above conditions are met. If youare not using an external system interlock circuit, connect user-provided jumpers between TB1-1 andTB1-2 and between TB1-3 and TB1-4.