Transcript
TMG E1632 PULSATING INDICATIONS Version 1.0 Issued 17 September 2012
Owner:
Chief Engineer, Signals & Control Systems
Approved by:
Warwick Allison Chief Engineer Signals & Control Systems
Authorised by:
Geoff Yarrow Principal Engineer Signalling Principles & Design Standards
Disclaimer This document was prepared for use on the RailCorp Network only. RailCorp makes no warranties, express or implied, that compliance with the contents of this document shall be sufficient to ensure safe systems or work or operation. It is the document user’s sole responsibility to ensure that the copy of the document it is viewing is the current version of the document as in use by RailCorp. RailCorp accepts no liability whatsoever in relation to the use of this document by any party, and RailCorp excludes any liability which arises in any manner by the use of this document. Copyright The information in this document is protected by Copyright and no part of this document may be reproduced, altered, stored or transmitted by any person without the prior consent of RailCorp.
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Engineering Manual
Engineering Manual Signals – Maintenance Manuals
RailCorp Engineering Manual — Signals – Maintenance Manuals Pulsating Indications
TMG E1632
Document control Version 1.0
Date 17 September 2012
Summary of change New document
Summary of changes from previous version Summary of change
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RailCorp Engineering Manual — Signals – Maintenance Manuals Pulsating Indications
TMG E1632
Contents 1
Scope........................................................................................................................................4
2
Background .............................................................................................................................4
3
Description of Equipment ......................................................................................................4
4
Circuit Arrangements .............................................................................................................4
5 5.1 5.2
Set Up Procedure ....................................................................................................................5 Equipment Adjustment for Incandescent Lamps ......................................................................5 LED Light Units .........................................................................................................................5
6
Regular Maintenance ..............................................................................................................6
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RailCorp Engineering Manual — Signals – Maintenance Manuals Pulsating Indications
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TMG E1632
Scope This maintenance manual describes the set up and maintenance of pulsating indications on relay controlled colour light signals.
2
Background Medium and Medium turnout indications on single light signals and Preliminary Medium indications on Double Light signals utilise a pulsating Yellow light. The pulsating is achieved by using a commercial twin timing relay in conjunction with a HDR relay. Circuit diagrams showing the typical arrangements are in SDG 001 Sheets A108 (Single light medium), A109 (Single light turnout) and A115 (Preliminary medium).
3
Description of Equipment The basic components used are as follows: Timing Relay:
Omron Type H3CR-F8 120volt AC Twin Timer
Cover:
Type Y92A-48B
Base:
Plug In Type P2CF-08
Resistor (Medium Aspect):
2000ohm 30w adjustable with mounting bracket
Resistor (Medium Turnout Aspect):
800ohm 70w adjustable with mounting bracket
The timer has 2 changeover type contacts and is suitable for operation over a wide timing range. Both timer on and timer off settings are adjustable. Indicator lights are provided on the timer to indicate the On/Off states. Broad timing adjustment is done by a small screwdriver to select the units (seconds, minutes, hours)) and the range (0-.1, 1-1, 0-10, etc) and the selected units range are indicated on the dial. Fine adjustment is achieved by use of the two dials, one for time off and the other for time on. In this application, it is essential that time off is set to 640 milliseconds and time on to 200 milliseconds. This is a flash rate of approximately 70 per minute. NO OTHER SETTING IS PERMISSIBLE. Once set, the Signal Engineer must glue the front cover in place, to prevent accidental change to the adjustment.
4
Circuit Arrangements The signal operating circuit is arranged such that the yellow lamps are extinguished during the timer on period. This ensures that a steady light is displayed should a failure of the timer occur.
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TMG E1632
The timer contacts are wired in parallel for reliability. The arrangement is inherently fail safe, as failure of the timer in either the energised or de-energised state will cause a more restrictive aspect to be shown. The ECR relay, a QSR3, is slow release by approximately 330 milliseconds and this holds up during the 200 millisecond lamp off time, when used in the medium aspect. A resistor is wired around the timing relay contacts. This has two functions: firstly, it maintains the current through the lamp during the lamp off part of the cycle to reduce the degree of filament shock with each flash, and secondly, this current holds up the filament changeover relay during the lamp off time. The timer is activated by the HDR relay. Where the medium is part of the aspect sequence it is also cut by the DR energising. This arrangement is to extend timer life as well as to ensure the timer is isolated from the supply, except when actually required, for surge protection. It also serves to isolate the otherwise non-vital timer where an internal breakdown could cause unpredicted output to occur in a vital lamp circuit. The ECR contact is included in the timer circuit for the medium turnout aspect to maintain a more restrictive aspect should the main head red be extinguished.
5
Set Up Procedure The timer is adjusted to give a time on of 200 milliseconds and time off of 640 milliseconds.
5.1
Equipment Adjustment for Incandescent Lamps The resistor is to be adjusted as follows:
5.2
a)
Ensure the HDR is up and the lamps are pulsating.
b)
Remove the timer.
c)
Slowly decrease the resistance until a reading of 90v is obtained across the resistor. At this point ensure the filament changeover relays are energised. For a single yellow SL35 lamp, this should occur at about 1150 ohms, and for a band of lights with SL35 at about 380 ohms. For other lamp wattages without filament changeover relays, the setting of the resistor to drop 90v is all that is required. In these cases, the actual resistance in circuit will vary depending on the lamp type.
d)
Ensure the filament relays will not drop out with voltage supply variations. This may occur if the resistor is adjusted to the 90v setting and the supply voltage is significantly higher than 120v.
e)
By inspecting the lamps, ensure that the filaments are still black.
f)
For the medium aspect, reinsert the timer and check that the ECR picks and drops if the timer is again removed.
LED Light Units Where LED light units are provided the resistor around the HDFR contacts is not required.
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Regular Maintenance The signal electrician on his regular maintenance inspection should ensure the timer is functioning and that the filament relays remain up during the pulsating of the lamp (for incandescent lamps).
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