Nautel XR3, Installation Manual

Page: 66 / 100

XR6/XR3 Installation Manual Control and monitoring
Page 9-8 Issue 3.1 2014-06-04
Option 2 - Differential Input (External V dc).
When you use an external dc voltage (24 V to
30 V) as the current source for a control function's opto coupler, configure the control function's
external switching circuit and the remote interface PWB’s selection circuit for a differential input. The
SINGLE/DIFF
3-pin header (E19) must have its 2-socket shunt post connected between pins 1 and 2
to configure the circuit.
Figure 9.2: Differential Input Selected
The normally open/momentarily closed switch should be located between the dc voltage's negative
output and the remote control circuit’s negative (-) input.
Inputs
This section describes the remote inputs to the system. These inputs are only accepted by the system
if the remote/local status is set to remote, unless otherwise noted. That setting can only be made by a
local user.
Inputs are toggled between states by an active pulse unless otherwise noted. To ensure proper
operation, the duration of the active pulse should be a minimum of 250 ms.
Note: The external PDM inhibit input is intended to be used in conjunction with
antenna switching circuitry, to ensure minimal RF output current is flowing during
the opening/closing of contacts in the transmitter's RF feed cable. An active
PDM
inhibit
condition must be applied, to inhibit the RF output, prior to contact
opening. The active condition must be maintained until contact closure has
occurred, and an appropriate impedance has been connected to the transmitter's
RF output. The RF output will instantly be restored to its original level when the
active condition is removed.
3
PWB
1 2
+24V
(+24V TO +30V)
EXTERNAL DC
DIFF
E19
S1830901 V2
PWR SUPPLY
INTERFACE
REMOTE
+24 V IN
(TB1-3)
REMOTE SELECTION CIRCUITRY
CONFIGURED FOR EXTERNAL
DC VOLTS
18