Table 17 – St950 Elv 40V Lamp Drive Capability - Siemens ST950 Handbook

The transformer has the following coloured secondary wires:
The 40/42V Controller is supplied wired for 40V, with the 40V Bright/Dim wires
connected to the HPU, and the 42V Bright/Dim wires terminated in a connector.
The 40/42V transformer is the same size as the 48V low inrush transformer, and allows
the controller to be run from a 25A Electricity Board cutout. The transformer size only
allows one transformer to be fitted in a Controller cabinet.
4.12.2 40/42V Controller Load and Lamp Drive Capability
The 40V signals have typical power of 7W in Bright and 3W in Dim.
The following table shows the ST950 ELV 40V lamp drive capability.
Max. lamp current that a normal ST950 ELV
40/42V Controller can supply excluding short-term
illumination, i.e. red/amber.
Max. lamp load for one 32-output LSLS card
(including red/amber).
Max. load for a single output on an LSLS card.
4.12.3 40/42V Cabling
The principles outlined in the general ELV cabling, section 4.11, apply. In order to
keep the voltage at the 40/42V signals within their specification, the allowable voltage
drop in the cables is limited to 3% of the nominal supply. The cable lengths for varying
loads are shown in the following tables.
Security classification
Version
Last Editor
Document Name
Copyright © Siemens plc 2015. All Rights Reserved.
Wire Colour
Yellow
Red
White
Grey
Table 17 – ST950 ELV 40V Lamp Drive Capability
Unrestricted
4
Paul Cox
ST950 General Handbook
Mobility Division, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
Designation
40V Bright
40V Dim (27V)
42V Bright
42V Dim (31V)
Max Max
Current Power
(Amps) (Watts)
17.5A 700W
17.5A 700W
2A 84W
Page
Status
Date
Document No.
Mobility is a division of Siemens Plc
No. of
LED
Lamps
100
100
8
63 of 107
Issued
16-Jul-2015
667/HB/46000/000