Specifications

Mobility and Logistics, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
Security classification Unrestricted Page 21 of 83
Version 2 Status Released
Last Editor Harry Smyth Date 09/12/2014
Document Name Configuration Control Document No. 667/CC/45950/000
Copyright © Mobility 2014. All Rights Reserved. Mobility is a division of Siemens Plc
3.5 Dimming Transformer
The dimming transformer for the ST950 is so called because it provides the necessary drive
to the MDU for onward delivery to the Lamp Switch cards. The appropriate transformer will
be contained with the Outercase, specified in Table 1 and should not be ordered separately.
Full details on the procedure for load calculation should be sought form the ST950 General
Handbook.
On those occasions when a 1.5KVA ST950 Outercase is specified the appropriate
transformer will be configured. Similarly, when a 3.0KVA 24ph wired Outercase is specified
the necessary dimming transformer will be configured to the controller.
ST950LED
Note, the ST950 LED has a single variant of dimming transformer rated at 500VA
The Dimming Transformers will occupy a position in the bottom left hand corner of the
controller. Figure 6 shows the transformer fitted to the ST950 cabinet.
To accommodate different input voltage to the Dimming Transformer mains input can be
applied to the Dimming Transformer at the appropriate terminals. Please refer to the ST950
General Handbook for full information.
Figure 6 – ST950LED Dimming Transformer