Specifications

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Mobility and Logistics, Traffic Solutions

Sopers Lane, Poole, Dorset, BH17 7ER

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Version 2 Status Released

Last Editor Harry Smyth Date 09/12/2014

Document Name Configuration Control Document No. 667/CC/45950/000

3.2.2 Mains Distribution Unit

The Mains Distribution Unit should not be ordered separately as it is included in the Rack

Assembly, which in turn is part of the Outercase, selected from Table 1. Configuration

Engineers should calculate the load anticipated and select the appropriate Outercase.

Please refer to the ST950 General Handbook for information on calculating controller loads.

The necessary Mains Distribution Unit will be fitted to the controller to accommodate the

required load. All variants of the Mains Distribution Unit contain the Dim/Bright, Relay A,

Relay B and SSR Relay. It also provides the Logic Power Supply, which supplies +5VDC

and +24VDC to the cards in the ST950 Rack Assembly. Incorporated onto the Mains

Distribution unit are two 5A power supply sockets, for use with test equipment. A 10 Amp

regulatory fuse is provided at the Mains Distribution Unit to provide a separate power supply

for sign equipment.

ST950LED

Configuration Engineers should note that the Mains Distribution Unit fitted to the ST950LED

is a modified version of the Mains Distribution Unit fitted to the ST950 Low Voltage

Controller.

3.2.3 Lamp Switch Cards

The Lamp Switch Cards provide the necessary phase output drive for the signal lanterns.

Please refer to Figure 2, which shows typical positioning of Lamp Switch Cards. Termination

strips are mounted to the termination panel, at the rear of the controller, to provide the

necessary connections, so the phase outputs can be distributed to street equipment. Each

Lamp Switch Card is capable of driving 8 distinct phases. The number of Lamp Switch cards

required in the Rack Assembly will be determined by junction configuration and load. Please

consult the ST950 General handbook for advice on calculation loads. Correlation between

the actual hardware mounted to a controller and the Processor’s knowledge of equipment

mounted in a controller is determined in the Configuration Programming Tool IC4.

Configuration Engineers should be fully trained in the use of IC4 in order to configure the

ST950 Controller.

The maximum number of Lamp Switch Cards that can be fitted to the ST950 Controller is

four, providing a potential to drive 32 separate phase outputs. Controller will be wired, at

manufacture, to accommodate the number of Lamp Switch Cards indicated in the table 1

description. The 8 phase wired controllers chose from Table 1 will be configured with one

Lamp Switch Card. The 24 phase wired controllers chose from Table 1 will be configured

with three Lamp Switch Cards. Additional Lamp Switch Cards and associated wiring should

be specified. Please refer to the part listing for these items. Information on routing of looms

and termination of connections should be sought from manufacturing diagrams. With

reference to Figure 2, Lamps Switch Cards occupy specified positions in the Rack

Assembly. The selection of the Outercase from Table 1, in addition to determining the

wiring, number of Lamp Switch Cards and the amount of current available to be drawn by

street equipment also determines the type of Lamp Switch Cards fitted to a controller. Lamp

Switch Cards fitted to the LED controller are specifically designed to operate in conjunction

with and monitor LED CLS NLM signal heads. Controllers without the LED designation

operate and monitor LED signal heads equipped with LMF modules. Further information on

controller selection should be sought from the ST950 Controller General Handbook.