Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 12 Page 58 of 265
667/SU/32900/000 for information on the compatible versions.
IMPORTANT
When signals are required to be lamp monitored, signal types
must not be mixed.
Specifically, when lamp monitoring Nearside Signals, it is not allowed to connect
Tactile Units or Audible Driver Modules in parallel to the Nearside Signals. In this
case, two or more LSLS Outputs must be specified for the pedestrian green aspect
in the IC4 Configuration (Phase Type and Conditions page), with lamp monitoring
disabled on the outputs used by the Tactile Units or Audible Driver Modules.
When output types are NOT lamp monitored, it is permissible to mix output types.
Specifically, it is permissible to connect 2 Tactile Units, 2 Green Nearside Signals
(either AGD or STC) and one Audible Driver Module (8 sounders) in parallel across
one LSLS output.
3.14.4 Lamp Supply Transformer and Power Consumption Example
The following sections detail how to select the correct lamp supply transformer and
estimate the power consumed by a controller, using the theoretical junction in Figure
13 as an example…
A
A
A
B
B
C C
C
D D
E
E
‘No Right Turn’
Regulatory Sign
A
B
C
STAGE 2STAGE 1 STAGE 3
D
E
Traffic Red / Amber / Green Signal (Main)
Traffic Red / Amber / Green Signal (Secondary)
Pedestrian Red / Green Signal.
Pedestrian Wait Indicator Box (on pole).
Key:
Figure 13 – Theoretical Junction (ST900 ELV)