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 222 of 240
Security switches
Connections are provided on the RDU for two security switches. The system reports the status of
these switches to the command and display system, track extractor or optional service display.
The normally closed (N/C) switch inputs switches are for monitoring purposes only and do not isolate
or control any aspect of the system.
Where fitted, these switches must be enabled during setting to work of the system.
Two switch connections are available as follows:
SKM / Ant Platform: This is designed for a security switch on the gate or access point to the
antenna platform.
SKN / Hut door: This is designed for a security switch on the equipment building or hut access
door.
Additional security switches can be serially added using a junction box (not supplied) in a similar
fashion to the security switches as shown on the previous page.
Antenna platform/ Hut door switch: Normally closed (N/C) switch returning a voltage back to
RDU.
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