VRIOGS 012.7.13 RevA - Point Mechanisms - Public Transport Victoria

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6 VRIOGS 012.7.13 Revision A SECTION 5.0 POINT CONTROL REQUIREMENTS This section of the specification states the minimum requirements to be considered for the design and manufacture of the Dual or Non Dual control point machine. 5.1 Operation and Construction a) The time of operation with the nominated operating voltage at the motor terminals shall not exceed 3 seconds with a minimum force of 6.70kN with an operating current of 10A (max), nor shall it exceed 3.5 seconds at a voltage 10% below normal. The manufacturer shall supply all operating values in relation to the various gear ratios used in the mechanism offered. b) The point machine mechanisms shall have a minimum service life of 30 years. c) The point machine mechanisms shall maintain its performance without need for adjustment over a temperature range of -20 to 70 degrees. d) The point machine mechanisms shall be so constructed and equipped that point operation can be stopped or reversed at any point of movement by manipulation of point control function. e) The point machine mechanisms shall be provided with staggered or top and bottom locking for normal and reverse position of points. f) Each point machine mechanism shall be equipped with an efficient friction clutch to prevent damage in case movement of points is obstructed. g) Each point machine mechanism shall include a means to automatically remove the motor drive after a pre-determined time should the machine not complete its full operation. The means utilised to remove the motor drive shall reset automatically when the point control is called to the opposite lie. This time-out period shall be set to between 3-4 times the expected operation times under full load. h) All parts of the point machine mechanisms shall be strong enough to permit the stopping of the points at any part of their movement by the introduction of an obstruction between the point blade and stock rails, without damage to any part. i) The point machine mechanisms and circuit controlling devices shall be enclosed in a metal weatherproof case, the covering of which shall be removable and equipped with suitable fastenings for application of padlocks (Refer to VRIOGS 012.2., Section 21.7), and when open shall provide access to all parts. NOTE: 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.
VRIOGS 012.7.13 Revision A 7 j) The point machine mechanisms case shall protect and secure the apparatus and wiring contained herein from unauthorised access. k) Means for readily draining oil and water accumulation shall be provided. l) Each point machine mechanism shall be fitted with detection contacts operated by the blade or blades and the locking plunger for ready adjustment to the required tolerances. The closed detection contacts shall open with a closed blade opening greater than 4mm and the locking is fully engaged. Detection contacts shall open on failure of detection linkage and/or detection rod or on the next point mechanism operation. m) Adequate provision shall be made to facilitate the lubrication appropriate to each of the moving parts; and where necessary, approved oil sealing shall be provided around moving parts of the mechanism leaving the gear case. n) The external cable entry to the point machine case shall be a metal, non ferrous cable gland located above the foundation plate and being secured with a 50mm metal flexible hose. o) Internal electrical connections shall be oil/heat resistant. p) To change from motor to hand throw operating conditions, the hand operating lever or levers shall perform in order the following functions:- • Open motor and signal circuits • Disengage motor operating mechanism • Engage hand throw operating mechanism To change from hand throw to power operating conditions, the hand operating lever or levers shall perform in order the following functions:- • Disengage hand throw operating mechanism • Engage motor operating mechanism • Close motor and signal circuit Hand selector and hand operating levers shall be interlocked to ensure the above sequences. q) The point machine mechanisms shall be so constructed that the point blades are moved to the full normal or full reverse position and locked before the hand operating lever can be latched in its position corresponding to the position of the points. r) The dual control point machine mechanisms hand operating lever or levers and their connection shall form an integral part of the point operating mechanism. s) A separate voltage free contact shall be provided to open the signal circuits when the hand selector lever is initially moved out of motor operation. NOTE: 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.
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VRIOGS 012.7.13 RevA - Point Mechanisms - Public Transport Victoria

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