Specifications

Mobility and Logistics, Traffic Solutions

Sopers Lane, Poole, Dorset, BH17 7ER

Security classification Unrestricted Page 75 of 83

Version 2 Status Released

Last Editor Harry Smyth Date 09/12/2014

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

4.14 Gemini

This unit is not included in the Outercase ordered from Table 4 and therefore must be

specified separately. Please refer to the family tree document for the Gemini unit

(667/1/32600/ETC) when specifying the make-up of the Gemini unit. Paragraph 4.7 explains

the location the Gemini unit can take within the ST950ELV cabinet. The Gemini unit

communicates with the ST950ELV CPU Card through a serial interface. To establish this

interface connect MCE0141 (667/1/26579/000) to PL4 on Gemini to the RS232 port 25 way

D on ST900ELV CPU. Power for the Gemini unit can be provided by utilising one of the mini

circuit breakers within the Master Switch Assembly. One mini circuit breaker will be installed

for the OTU (Gemini); however, a second and third kit may be fitted using kit of parts

667/1/27121/000. Positions for these additional power facilities are shown on

667/GA/27121/000.

Note: These two additional kits can only be fitted if the 300mA RCD unit is not required.

To provide Lamp Supply monitoring on the Gemini the ‘High V’ Input 2 can be utilised. An

electro-mechanical relay switched from an I/O card output (via Special Conditioning)

provides the lamp supply loss indication into the Gemini unit. Full installation details can be

obtained from drawing 667/GA/32612/000.

If wired at the factory, the wires for connection to an I/O card output will be brought within

reach of the I/O card outputs but left unconnected. The correct output will need to be

identified for each installation, and the wires connected to the output N.O. (violet wire) and

output COM (grey wire). Consult the configuration’s Special Instructions for details of how to

activate the Special Conditioning code to drive the ‘supply monitor’ relay.

Figure 72 – Gemini Connections

Warning! It is important that the Gemini Last Gasp Dial Battery, within the Gemini Power

Supply Unit, is orientated correctly; the battery terminal must be facing up. If the unit is to be

mounted in such a way that the battery terminals are not facing up then it is necessary to

implement certain modifications to ensure that the battery is not operating upside down.

Please refer to document 667/HB/32600/000 for the necessary modifications.