Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 12 Page 56 of 265
3.14.2 Lamp Drive Capability
The following table gives the lamp drive capability of the controller as a whole, each
‘Phase Driver’ (or ‘Lamp Switch’) card and each aspect. The ‘Watts’ and ‘Lamps’
columns are equivalents for the currents shown based on a 48V supply and 12W
Siemens Helios ELV Signals respectively.
Max
Current
(Amps)
Max
Power
(Watts)
No. of
LED
Lamps
Max. lamp current that a normal ST900 ELV
Controller can supply including regulatory signs and
excluding short-term illumination, i.e. red/amber.
20A 960W 80
Max. lamp current that a ‘high-current’ ST900 ELV
can supply including Regulatory Signs but excluding
short-term illumination, i.e. red/amber. Also see note
below
40A 1920W
160
Max. lamp load for one 32-output LSLS card
(including red/amber).
20A 960W 80
Max. load for a single output on an LSLS card. 2A 96W
See
3.14.3
Table 11 – ST900 ELV Lamp Drive Capability
Note
The high-current ST900 uses the 40A Controller Upgrade Kit. This
increases the current capability (including regulatory signs) of the Controller
to 40A. This option also uses two ELV transformers, see section 3.14.5.