Specifications

Mobility and Logistics, Traffic Solutions
Sopers Lane, Poole, Dorset, BH17 7ER
Security classification Unrestricted Page 72 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
4.12.3 Six Amp Ancillary Power Supply
On those occasions when additional -24 AC power is required, and a second HPU has not
been specified, an additional 6 Amp DC RMS power supplies 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/33074/ETC.
With reference to the Figure 67, 67 and 68, the AC input for the ancillary power supply
should be obtained from the MCB Supply on the master switch unit (Live connected to MCB
SW1 and 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 figure below. Orange wire will be used to connect the DET COM + output from the
rectifier to the terminal block. Slate coloured wire will be used to connect DET SUP – 24V
from the rectifier to the terminal block. Please refer to 667/GA/33074/ETC for a detailed
connection scheme and earth arrangement.
Please Note! 6 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 6 Amp power supplies will be required, to
service the configured load, AC input for the additional powers supplies should be
provided by configuring the ST900ELV controller with additional MCB.
Figure 67 – Detector Power Figure 68 – Detector Power
Figure 69 – Detector Power
DET COM + Orange
DET SUP – 24VAC Slate
Output from Step
Down transformer
DET COM + Orange
DET SUP – 24VAC
Slate
Mains Power provided from
the Master Switch Unit
MCB
Live + VE
Neutral - VE
N3
SW1