Nautel XR3, Руководство по установке

Страница: 65 / 100

XR6/XR3 Installation Manual Control and monitoring
Issue 3.1 2014-06-04 Page 9-7
Remote control circuits and alarms
You can control the active (A/B) exciter, the on/off status of the RF power stage, the preset RF
power level, the power level adjustment, and system alarm reset remotely. The remote interface PWB
contains a selection circuit that lets you select internal (single ended input) or external (differential
input) input for all controlled functions.
The external control circuits interface with the transmitter through opto couplers on the remote
interface PWB. The opto couplers buffer and isolate the external circuits and prevent any unwanted
transients from affecting transmitter operation while remote control is selected at the transmitter.
The switching circuits for the remotely controlled functions must be the equivalent of a normally
open (momentary) switch. The switches must be configured to operate as a single-ended input using
the transmitter's 24 V dc as the source, or as a differential input using an external dc power supply (24
- 30 V). Each control function has negative inputs on the remote interface PWB. The positive
external
+24 V IN
input (TB1-3) is used by all control functions.
Option 1 - Single Ended Input (Internal V dc).
When you use the transmitter's 24 V as the
current source for a control function's opto coupler, configure the circuit on the remote interface
PWB for a single ended input. The
SINGLE/DIFF
3-pin header (E19) must have its 2-socket shunt
post connected between pins 2 and 3 to configure the circuit.
Figure 9.1: Single-ended Input Selected
A negative logic (active state is a current-sink-to-ground) command must be applied to the control's
negative (-) input. To avoid a ground loop, obtain the ground from TB1-18.
3
PWB
1 2
+24V
E19
SINGLE
S1830900 V1
+24 V IN
(TB1-3)
INTERFACE
REMOTE
REMOTE SELECTION CIRCUITRY
CONFIGURED FOR INTERNAL
DC VOLTS
18