User's Manual
SBS-900 Shore Based Radar Systems
Chapter 9: Planned maintenance
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 87 of 240
9.3 System isolation
In addition to the normal health and safety requirements, the system must be made safe prior to
carrying out any maintenance task by fully isolating all AC power including any UPS supported
supplies to the system as shown below:
Man aloft
switch
(MAS)
As an additional safety precaution, the Man Aloft Switch
can be placed into the OFF position.
This acts as a backup safety measure to removing the
Antenna Rotation keyswitch.
RDU
Antenna
rotation
switch
Place the Antenna Rotation keyswitch on the front of the
Radar Distribution Unit into the OFF position.
The key should be removed and retained until the
maintenance task being undertaken has been completed.
DTX-A7
Transceiver
enclosure
Ensure that the AC breaker(s) located within the
transceiver enclosure are in the OFF position.
Note: Sb_ KDCm ih _[]b \l_[e_l [l_ cffogc[n_^ qb_h @B
supplies are still connected to the transceiver enclosure.
RDU
AC power
Within the Radar Distribution Unit, ensure all
breakers are in the OFF position.
Note: Vb_h mqcn]b_^ NEE+ nb_ KDCm ih _[]b
breaker remain illumiated indicating that AC
supplies are still connected to the RDU.
External AC
Isolate and disconect ALL single and 3-phase AC supplies to the Radar
Distribution Unit including all UPS supported supplies and physically remove all
power sockets.
The system is now fully isolated from all sources of AC supply.