Specifications

Mobility and Logistics, Traffic Solutions

Sopers Lane, Poole, Dorset, BH17 7ER

Security classification Unrestricted Page 71 of 83

Version 2 Status Released

Last Editor Harry Smyth Date 09/12/2014

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

4.12.2 Two Amp Ancillary Power Supply

On those occasions when additional -24 AC power is required, and a second HPU has not

been specified, an additional 2 Amp DC RMS power supply can be provided. This should be

positioned above the HPU on the left hand panel. Additional information on this exact

position may be sought from drawing 667/GA/33075/ETC.

With reference to the Figure 64, 64 and 65 the AC input for the ancillary power supply

should be obtained from the MCB on the master switch unit (Live connected to MCB SW1,

Neutral connected to Terminal N3). The step down transformer will be supplied with

conventional power supply leads, to allow this connection.

The AC output from the transformer is rectified and applied to a terminal block, as detailed in

the figues below. Orange coloured wire will be used to connect the DET COM + output from

the rectifier to the terminal block. Slate wire will be used to connect DET SUP -24V from the

rectifier to the terminal block. Please refer to 667/GA/33075/ETC for a detailed connection

scheme and earth arrangement.

Please Note! 2 Amp power supplies contain both transformer and associated rectifier.

When specifying multiple power supplies care should be taken to ensure that there is

sufficient space within the specified cabinet for the required items.

Please note! If it is anticipated that multiple 2 Amp power supplies will be required, to

service the configured load, AC input for the additional powers supplies should be

provided by configuring the ST950ELV controller with additional MCB.

Figure 64 – Detector Power Figure 65 –Detector Power

Figure 66 – Detector Power

DET COM +

Orange

Output from Step

Down

transformer

DET COM +

Orange

Mains Power provided from

the Master Switch Unit

MCB

Live + VE

Neutral - VE

SW1