User's Manual

SBS-900 Shore Based Radar Systems
Chapter 10: Corrective maintenance
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 209 of 240
10.8.12 NTX-A490 signal I/O module
Modular interface system module type 11 signal I/O module
Part number NTX-A490
Backplane location: B4
Overview: The signal I/O Module within the Radar Distribution Unit is controlled by the
backplane and provides the following interfaces:
- Three switched relay outputs: F-OUT, S1-OUT and S2-OUT.
- Three co-axial outputs: SKA, SKB and SKC.
- Four I/O channels configurable using links to be inputs or outputs.
- Two Input only channels and two output only channels.
Coaxial outputs: There are three identical coaxial outputs with adjustable voltage levels of
between 5.0V and 15VDC.
Switched relay outputs: There are three Identical Relay outputs. These are primarily used to control
the 3-phase inverter which supplies power for the gearbox motor.
Input/ outputs: Configurable ports (channels 1 to 4): The board has four configurable input/
output ports that can be configured using links to be:
- A pulse input with a relay output.
- An opto-isolated input.
- An isolated input.
- An input and output port.
Non configurable ports (channels 5 and 6): Pulsed inputs with a relay
outputs.
LEDs, links and test points
LED (green)
D
24
Lit when
internally generated +5.0V is present
D
24
Lit when
internally generated
-
5.0V is present
Links
LK1
Position A
Pulse in/ Relay out
(default)
Position B Differential output
LK2
Position A Pulse in/ Relay out
Position B
Differential output
LK3
Position A +15V ref for input; input action low on IOB
Position B
Input drive from IOA
LK4
Position A Closing contact relay
Position B
Opening
contact relay
LK5
Position A
Ground ref for relay
Position B +15V ref for relay
LK6
Made
Connects IOB to relay ref
Open No action
LK7
Position A Pulse in/ Relay out
Position B
Differential output
LK8
Position A Pulse in/ Relay out
Position B
Differential output
LK9
Position A +15V ref for input; input action low on IOB
Position B
Input drive from IOA
LK10
Position A
Closing contact relay
Position B Opening contact relay
LK11
Position A
Ground ref for relay
Position B +15V ref for relay