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 180 of 240
10.8.2 AC power
Single phase supply: Dual single phase AC mains inputs are required. It is recommended that
each mains input is provided via a separate external UPS which is not
supplied as part of the SBS system.
- The AC supplies are fed to the dual redundant AC-DC power unit via a
set of user accessible over current protection devices in the form of
circuit breakers and contactor relays.
- Switched single phase AC outputs are also routed to the transceivers.
AC power loss:
Main input A: In the event of the loss of mains input A, the dual redundant AC-DC power supply will
continue to operate using the mains input B power source, however AC power to the
Tx/ Rx A (SK/ PL5) will be lost.
In an emergency and with all supplies isolated, AC power may be restored to Tx A by
temporarily reversing mains input A & B.
Main input B: In the event of the loss of mains input B, the dual redundant AC-DC power supply will
continue to operate using the mains input A power source, however AC power to the
Tx/ Rx B (SK/ PL6) will be lost.
Operators are alerted to the loss of any AC input through system alarms.