User's Manual

SBS-900 Shore Based Radar Systems
Chapter 2: Health & Safety warnings
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 9 of 240
2.5 Working aloft
SAFETY ALOFT:
When working aloft or near any radar scanners, moving or RF radiating equipment, ALL
power sources to the platform and equipment must be fully isolated.
Before working aloft ensure someone in authority or at ground level knows of your
intentions and ensure that suitable clear warnings are in place.
Ensure all means of access aloft are secure and beware of wet or slippery ladder rungs
and working areas.
All working at height health and safety requirements and procedures, including the
inspection and use of personal protective equipment (PPE), must be adhered to at all
times as advised and required by your employer, site regulations, shipyard or vessel.
2.6 Man aloft switch/ antenna isolation.
Antenna rotation and transmission can be inhibited via a Man Aloft Switch (MAS) or an r<agXaaT IAA-
AeXXs keyswitch. These mechanisms can be used by a person who sees a potential hazard such as a
loose halyard and decides to protect the antenna.
When activated, the reason for loss of turning is detected by the system and is reported to the local
and remote users
Safety switches
Antenna
Rotation
keyswitch
The Antenna Rotation keyswitch is located on the door of the internally mounted
Radar Distribution Unit (RDU)
The key for the RDU keyswitch is captive when set to Free (enable rotation) but
can be removed when the keyswitch is to OFF.
When in the OFF position all single and 3-phase AC power to the antenna and
transceiver is isolated thus stopping antenna rotation and transmission.
The key should be removed and retained by the person who intends to enter the
potentially hazardous volume of the rotating antenna.
Man aloft
switch
(MAS)
The man aloft switch (MAS) is designed to be installed such that it is still viewable
for the person who is carrying out maintenance tasks.
Vb_h m_n ni nb_ •OFF jimcncih the transceiver/ gearbox is isolated from all single
and 3-phase AC power thus stopping the antenna rotation and transmission.
The Man Aloft switch, Motor ON/ OFF and Antenna Rotation keyswitch form part of a safety current
loop. This safety loop is purely hardware (no software), when the current loop is opened, AC mains
supplies to the transceivers and antenna inverter are switch OFF by use of contactors.
Kelvin Hughes recommends that the key switches noted above are used in conjunction with the man
aloft switch but also recommend that radar users carry out a safety assessment and risk mitigation
procedure in terms of interlocks prior to approving any work on the equipment.
Full details on isolating the systems from the AC supplies can be found in the planned maintenance
section of the relevant systems Operator & Maintenance handbook.