Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 12 Page 46 of 265
3.3 ELV Controller Expansion Cabinet
For large junctions, it may be necessary to fit an expansion cabinet, adjacent to the
primary cabinet. The Expansion Cabinet Kit does not have a connection to the
mains supply and is typically used to house IO cards and their associated cabling.
Long-length serial cables are used to connect the IO cards in the expansion cabinet
to the PHS in the primary cabinet.
When mains-powered equipment is fitted into the expansion cabinet, an Expansion
Cabinet kit ELV Master Switch is required. This kit allows a mains supply to be taken
into the expansion cabinet and safely terminated.
When an LSLS is to be fitted into the expansion cabinet, an LSLS Expansion
Cabinet Kit is required. This kit includes a 20A lamp transformer, HPU, a single
LSLS and LSLS Backplane.
Additional LSLS cards and LSLS backplanes can then be fitted up to a maximum of
3 LSLS cards in the Expansion Cabinet. For the total number of LSLS cards that can
be supported by the controller, see section 3.13 on page 54.
It is not necessary to have a separate Feeder Pillar for the expansion cabinet.
3.4 Fitting the ELV Controller into Alternative Cabinets
When fitting an ST900 ELV Controller into an enclosure other than an ST900
cabinet, a different type of 6U rack can be used, a so-called ‘cuckoo’ rack. This rack
houses up to three LSLS cards and has two 3U high bays which can be fitted with
up to two Intelligent Detector Backplanes, supporting a maximum of eight Loop
Detector cards. In the UK, the controller may only be fitted into an HA-approved
enclosure.
The procedure for fitting an ST900 ELV Controller into an alternative enclosure is
very dependent on the type of enclosure and the type and position of existing
equipment.
Note
Detailed installation instructions are included in the drawings
contained in the kit relevant to the cabinet.