Regulatory Signs Monitoring - Siemens ST950ELV Handbook

PL4, LSLS Lamp and
PL6, Logic supplies
PL7
PL5 Transformer
Low Power
SK3 Transformer
High Power and
Earth
4.2.1

Regulatory Signs Monitoring

The HPU is equipped with a Regulatory Signs supply as standard (SK1 on the HPU
as shown in Figure 12 above). The supply can be monitored for up to eight
regulatory signs. If the junction contains more than eight signs in total then a
Regulatory Signs Supply and Monitoring kit is needed. This allows a further 12
regulatory signs to be powered and monitored.
Figure 15 – Regulatory Signs Supply connections
The HPU (and LSLS Card 1 through PL3) are fitted with the circuitry to monitor the
regulatory signs. No external torroids are required in order to monitor the regulatory
signs. If a second HPU is fitted, this can supply and monitor up to eight more
regulatory signs; connect PL3 of HPU2 to the first Reg Sign input on SK5 of the
LSLS Card connected to PL4 of HPU2 (i.e. the first LSLS connected to HPU2).
LSLS card connections are described in section 4.13.
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Version 7
Last Editor manpreet.jeerh
Document Name ST950 ICM Handbook
Copyright © Siemens plc 2020. All Rights Reserved.
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Lamp and logic supply connections to LSLS1, LSLS2,
and LSLS3 cards.
Detector, Reg. Sign, and 3 off LSLS logic supplies.
Bright, Dim, and Common connections from
transformer. Earth connection to earth all supplies on
HPU card.
Table 3 – HPU Connections
Reg Sign Returns (Gnd)
Reg Sign Supply (-48V)
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Page 33 of 154
Status Issued
Date January 2020
Document No. 667/HE/45950/000