Nautel V10 User's Installation And Operation Manual

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Nautel V10 User's Installation And Operation Manual Manual pdf 33 page image

V10/V7.5/V5/V3.5 Installation and Operation Manual Page 2-9Section 2 Preparation for Use and Installation Issue 3.52.2.12 External InterlocksThe external electrical interlock circuit isconnected between XMTR INTLKterminals TB1-1 and TB1-2 of the remoteinterface PWB (A44). It must present ashort circuit (low impedance) between theterminals when the interlock circuit isintact and it is safe to enable the RFoutput. It must present an open circuitwhen any interlock switch is activated andthe RF output requires inhibition. Anynumber of serial interlock switches maybe installed.2.2.13 Remote Control CircuitsThe transmitter control/monitoringfunctions can be facilitated by means of aconventional remote control interface orserial port (using the NxLink module), allavailable via connection to the remoteinterface PWB (A44). See paragraph2.2.14 for a description of the serial portfeatures. Remote control inputs are polled(sampled) every 100 ms. Ensure theactive pulse duration is a minimum of 100ms. The on/off status, active (A/B) exciter/IPA/IPA PS/Fan PS, active power preset(1-6), RF power level, and system resetcan be controlled remotely by switchingcircuits.NOTEUnless noted, all remote interfacing isdone via the remote interface PWB (A44).External control circuits are interfaced tothe transmitter through opto-couplers onthe remote interface PWB. The opto-couplers buffer/isolate the external circuitsand prevent unwanted transients fromaffecting transmitter operation. Theseopto-couplers only have influence whenRemote control is selected. All externalinput/output interface connections areshown in Figure 2-7a (V10/V7.5) or 2-7b(V5/V3.5). The remote interface PWBcontains circuits that allow the user toselect an internal (single ended input) orexternal (differential input) dc powersupply as the current source for the opto-coupler associated with each controlledfunction.The switching circuit for each remotelycontrolled function must be the equivalentof a normally open/held closed, spring-loaded (momentary) switch. Each must beconfigured to operate as a single endedinput using the transmitter's regulated15 V as the dc volts source (see Figure2-4), or as a differential input using anexternal dc power supply (5 V to 30 V) asthe dc volts source (see Figure 2-5). Eachcontrol function has positive and negativeinput terminals on the remote interfacePWB to accommodate the selectedconfiguration.Figure 2-4 Single Ended Input SelectedSingle Ended Input (Internal V dc)When the transmitter's regulated +15 V isused as the current source for a controlfunction's opto-coupler, its circuit on theremote interface PWB must be configuredfor a single ended input. The 3-pin headerassociated with the control function musthave its 2-socket shunt post connected asdepicted in Figure 2-4, noting pins 2 and 3of the header are shorted by the shuntpost. A negative logic command (activestate is a current-sink-to-ground) must beapplied to the control's negative (-) inputpin. The active command should be ofsufficient duration (minimum 100 ms) toensure being sampled. See Table 2-3 orFigure 2-7a (V10/V7.5) or 2-7b (V5/V3.5)for dc return (ground) locations.3 PWB1 2+15VE#S1830085 V3INTERFACEREMOTEREMOTE SELECTION CIRCUITRYCONFIGURED FOR INTERNALDC VOLTS