VRIOGS 012.7.15 RevA - Train Protection Warning Systems - Public ...

VRIOGS 012.7.15 Revision A 7SECTION 5.0TECHNICAL REQUIREMENTS OF TPWSThis section of the specification outlines the minimum technical requirements to beconsidered for the design and manufacture of the TPWS.5.1 Electrical RequirementsPower Supply (Trackside):Inrush Current:Power Factor:Signalling Interface:Earthing Requirements:88 – 121V AC, 47 to 60Hz• 75mA typical for single function cabinet• 150mA typical for single signal enclosure• 300mA typical for four function doublesignal2.5A at 121 V AC typical0.88 at 88V AC to 0.78 at 121V AC110VAC energised when main stop signal lit< 4Ω• 3.5mA min• 5mA maxLoop Frequencies (kHz): F1 - 64.25F2 - 65.25F3 - 66.25F4 - 64.75F5 - 65.75F6 - 66.75Table 2 - Electrical Requirements5.2 Voltage Input Requirementsa) Each TPWS OSM or TSM shall be fed from an associated TPWS SIM.b) The SIM shall require the following inputs from the signalling system:-• 110V AC Power Supply;• 110V AC Main Input (normally permanent);• 110V AC Suppression InputNOTE: This document is controlled only when viewed on the DOT Engineering Standards website.Any other copy of this document is uncontrolled, and the content may be inaccurate.