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SBS-900 Shore Based Radar Systems
Chapter 5: Technical overview
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 31 of 240
AC requirements
Single phase: Two independent sources of UPS supported, single phase, 115/ 230VAC supply are
connected to the RDU.
The AC voltages are fed to an AC-DC power supply via user accessible breakers
located within the RDU. The internal power supply provides all the DC power
requirements of the RDU.
Switched AC supply is sent from the RDU to the DTX-A7 transceiver enclosure.
3-phase: A 440VAC 3-phase input is fed via a user accessible breaker to an internal static
inverter. This generates and controls the three phase requirements of the turning
mechanism solution.
Caution: When the three phase supply is connected and switched ON, the inverter
unit is powered and sends three-phase voltages to the antenna motor which may
rotate immediately (see safety switches).
Safety switches: A normally closed safety current loop is provided for the serial connection of safety
switch contacts including an external Man Aloft switch.
Antenna rotation switch: An Antenna Rotation safety keyswitch
is provided on the RDU and is part of the safety current loop. This
switch can be set to OFF, removed and retained by the
maintainer for safety.
Man Aloft Switch (MAS): An externally mounted switch that can
be set to Free (rotate) or OFF.
When either the Antenna Rotation or Man Aloft switches are set
to OFF or if the safety current loop is broken/ open, the single and
3-phase AC supplies from the RDU to the transceiver enclose
and gearbox are isolated thereby stopping Antenna Rotation and
system transmission.
RDU Antenna
Rotation switch
External Man Aloft
Switch
Security Switches: There is also provision for an optional set of normally closed Antenna Platform
and a Hut Door switches that are used for monitoring purposes only. These switches
do not isolate or control any part of the system, when fitted and enabled, the systems
report the status of these switches to the RDU.