Flow Diagrams
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- Pages: 13
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Description 1 2
Screwdriver set
3 4
security hex/torx bits
5 6 7 8
Allen key set (metric)
Crimp gun for connectors Crimp gun for ferrules
Part no.(If required) Standard set Standard set Standard set Tyco crimps Grip on 912.07 Standard
DVM Ferrell crimps
1.1. Tools required for Maintenance and Repair
10. Fault Diagnosis Under normal operation conditions and with no vehicle present all the ‘Proceed LEDs should be illuminated in the GEE cabinets. This is with the exception of some GEE boxes situated on the roundabout were the yellow inhibit LED is on permanently on the in fills, merges and diverges. The fault diagnoses should be carried out using the ATS trolley with the Redcliffe monitoring system. The proceed signals may be lost momentarily as the receivers approach loop boundaries, this is normal and should be expected. Only when the proceed /speed signals are lost for a sustained section of the loop will indicate a problem. The trolley should be pulled along the guideway and the six measurements visually monitored. Checks should be made for loss of proceed signal strength (F1 & F2). The signal strength should never fall below 1000 mV anywhere on the guideway The signal strength on the roundabout will be lower than that of the straight sections due to the wider loop widths on the merges and diverges. Measurements on the trolley differ to those of the vehicle, so these measurements are for indicating faults, not for accurate readings. Commercial In Confidence
Page 1 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
The vehicle box and monitoring system can be remove from the trolley and fitted to an ATS vehicle in order to obtain more accurate measurements. Note. This procedure should be carried out whenever a repair or calibration is completed
Monitor System Faults The support required here is to process and relay on to Central Control the alarm messages provided by the AVP. The messages can be processed to locate faulty loops by: •
Vehicle undetected - noting gaps in the ‘Loop Occupied’ sequence as the vehicle passes and/or appearance of the ‘Detector Fail’ signal.
•
Loops not transmitting – no ‘Proceed On’ signal from one or more loops when not inhibited, and/or appearance of the ‘Proceed Signal/Inhibit Fail’ signal.
•
Failure to inhibit loops correctly – no or spurious ‘Loop Inhibited’ signals when expected, and/or appearance of the ‘Proceed Signal/Inhibit Fail’ signal. Listed below are the faults that could be detected by the control room.
Loop Faults Fault No. 1 2 3 4 5 6 7 8 9
Description Fails to detect Vehicle False vehicle detection Fails to Inhibit False Inhibits False Proceed signal (Same as 3) No proceed signal Monitoring signal fault with no fault in functionality Speed limit incorrect False Alarm.( Alarm activates with no real fault)
Flow diagram Reference. 17.7 17.6 17.7,17.12 17.4 17.7,17.12 17.4,17.8,17.12 17.11 17.10 17.11
GEE faults
Fault No 1 2 3 4
Description Fails to detect vehicle on one side Fails to proceed on one side Interface Failure(Any inter GEE inhibits, Power down inhibit or sync failure Master sync Failure
Commercial In Confidence
Flow Diagram Reference 17.7 17.9 17.8 17.3,17.8
Page 2 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Vehicle Faults
Fault No. 1 2 3 4 5
Description Fails to transmit presence signal( Vehicle undetected) Faulty Speed signal provided False proceed or speed signal No proceed or speed signal Incorrect speed signal
Commercial In Confidence
Flow Diagram Reference 17.7 17.1 17.11 17.9,17.12 17.10
Page 3 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
17.2.Flow Diagram of Proceed Signal Inhibit Fault on one Loop control PCB
Proceed signal/ Inhibit fail LED 1 illuminated on one Loop control PCB
Remove suspect Loop controller PCB using red eject lever and replace with spare Loop control PCB
Yes
Has fault gone?
Loop Control PCB faulty
No From 17.6 17.2(a)
Turn the rack 90º to gain access to backplane Ref 12.1.1
Unplug the preamp plug associated with the suspect loop control PCB. Unplug the next preamp plug along and swap the two over
Has the fault moved from the original loop control PCB to the next one along?
No
Connection problem between Loop control PCB and backplane
Yes Preamp cable, preamp or loop connection problem. Remove the GRP lid to gain access to the suspect Preamp box.
CONTINUED
Are connections on TB1 & J1 on preamp secured?
No
Secure connectors and check for fault condition
Yes
Has gone?
Yes
Commercial In Confidence
Connection problem
Page 4 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Preamp PCB fault
Yes
Open preamp box
No
(Ref 13.1.5) Replace preamp. Has fault gone from loop control PCB?
No
Check continuity of preamp cable and crimped connectors
17.3Flow Diagram of Proceed Signal Inhibit Fault on all Loop control PCB
PSIF: Proceed signal/Inhibit Fail Proceed signal/ Inhibit fail LED (1) illuminated on all Loop control PCBs in GEE cabinet on side ’A’ or side ’B’ or both
Yes Are PSIF LEDs illuminated on sides A & B?
Commercial In Confidence
Check next GEE box Upstream. Are all PSIF LED s illuminated on sides A or B? th
Page 5 of 13 6 August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
No Replace Slave Sync PCB. Has fault gone? Replace Master Sync PCB Refer to FAT test
Yes
No
Slave Sync PCB fault. .Refer to FAT test
Replace Oscillator coder PCB.
Yes
Oscillator Coder PCB fault. Refer to FAT test
Has fault gone?
17.4.Flow Diagram of False Inhibit Fault on Loop Control PCB One inhibit LED illuminated with no vehicle in close proximity
Remove the next 2 Loop control PCBs to the right of the inhibited one
Is the Loop PCB still inhibited?
No
Fault with one of the adjacent Loop control PCB. Refer to Loop Control FAT test
Yes Replace suspect Loop PCB with spare
No Is the Loop PCB still inhibited?
Yes
Fault with Loop Control PCB. Refer to FAT test
Commercial In Confidence
Page 6 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Is suspect loop PCB associated with an impact switch?
Reset impact switch
Yes
No
Note: If backplane is of the configurable type check for broken connections on the back. Ref 10703-LK- GEExxx
Possible Backplane connection problem. Refer to 13.1.3 to replace backplane.
17.5.Flow Diagram of Detector Fail LED fault on Loop Controller PCB
Is the Detector fail LED permanently illuminated on the Loop control PCB?
No
Is other side operation correctly?
No
Flashes on occasionally This may not be a problem please refer to Redcliffe
Determine fault with other side
Yes Swap suspect Loop control PCB with Yes spare
Has Detector fail LED gone out?
Is fault still present?
No
Please refer to Redcliffe
Yes Loop control PCB fault
Commercial In Confidence
Page 7 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
17.6.Flow diagram of False Occupied fault on Loop Control PCB.
Occupied LED (5) illuminated on loop control PCB with no vehicle present
Replace suspect loop PCB with spare
Has fault gone?
Yes
Fault with Loop control PCB Please refer to Loop Control PCB FAT test
No Use Preamp test box to check preamp wiring and preamp
Yes Is preamp functioning correctly?
Please refer to Redcliffe
No Problem with Preamp/wiring Refer to flow diagram 17.2 (a)
17.7.Loop control PCB Fails to Detect Vehicle on one side Commercial In Confidence
Page 8 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd Loop control PCB fails to detect vehicle entering loop (on one side)
No
Proceed signal/ inhibit fail LED (!) illuminated see 15 Detect Fail LED (2) Illuminated see 15.
With no vehicle present Only Proceed LED (4) should be illuminated
Inhibit LED (3) Illuminated see 15.
Yes
Position ‘Test trolley’ (Ref 15.1) over suspect loop. Only the proceed LED (4) and the Occupied LED (5) should be illuminated
Problem with Vehicle board. Please refer to Vehicle PCB FAT test
No
Replace Loop
Yes
Control PCB.
Faulty Loop controller PCB
Is test trolley detected?
No Problem with pre-amp or wiring. Please refer to flow diagram 15.2 (a)
17.8.Pre-amp faults Gain of Preamp too high If the gain of the preamp has become too high it is possible for the preamp in that loop to detect a vehicle too early and inhibit itself. This faults would cause a dropout of proceed signal on that side. This fault could also affect loops in close proximity such as at merges and diverges. Gain of Preamp too Low The vehicle may lose the proceed signal in the loop controlled by the faulty preamp.
Commercial In Confidence
Page 9 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Faults between GEE Cabinets The system is design that if a fault should occur between cabinets the system would fail safe and permanently inhibit the affected loops.
17.9.Flow diagram of loss of proceed signal on vehicle
Loss of Proceed signal to vehicle
Is there a vehicle
Yes
A head
No
Commercial In Confidence
Provided the vehicle is within minimum headway, the system is inhibiting correctly
Page 10 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Check the status of the loop control PCB associated with the loop at which proceed signal is lost
Yes
Refer to flow diagram 16.4
Is occupied LED (5) illuminated on associated Loop PCB?
No Is ‘lost transmitter alarm’ activated on vehicle PCB? (Ref. Vehicle PCB FAT) test
No Put ‘Txbox’ in loop (ref 15.4)
Yes
Is Occupied LED ILLUMINATED?
The problem is with preamp or associated wiring. Ref 17.6.
Fault with vehicle PCB or Vehicle Transmitter. Check calibration of 1 kHz on vehicle PCB. Refer to Vehicle FAT test
No Replace loop control PCB with spare.
No
If this fault has occurred on a roundabout the problem could be connection problem on configurable backplane
Yes
Fault with loop control PCB. Refer to FAT test
Is occupied LED on?
17.10.Flow diagram for loss of speed signal on vehicle Speed jumpers on back plane incorrect. See 12.1.3 (11.1.3)
Yes
Is Speed signal stable but incorrect
No Loss of speed or unstable speed readings
Are all or most of the loops in one GEE cabinet affected?
No
No
Fault with loop control PCB. Refer to FAT test
No
Yes Fault with Vehicle box or TX/RX units. Refer to FAT test
Yes
Swap associated loop control PCB with spare. Has fault gone?
Use ATS ‘test trolley’ to check speed readings. Are faults still present?
Yes Swap Oscillator PCB with Spare.
Commercial In Confidence
Change preamp (ref 13.1.5 preamp removal) Has fault gone?
Preamp fault. Refer to FAT test
No Refer to Redcliffe
Page 11 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Speed signal ok?
No
Yes Suspect Oscillator PCB requires calibration. Refer to FAT test
17.11.Monitoring signal fault with no fault in functionality
Monitoring system detects fault but system functioning correctly. Alarm indicated in control room.
Loop Control PCB Replace the suspect loop Control PCB. Has fault been removed?
Yes
Fault. Refer to FAT test
No
Possible problem with ribbon cable connection on rear of backplane to monitoring box (ref 6.2 for backplane details). Check monitoring box
Commercial In Confidence
Note. A damaged Opto-coupler on the output of the loop control PCB may only show in the control room and not on the PCB itself.
Page 12 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
17.12.Loss of proceed signal on one or both side
Loss of proceed signal one or both sides of GEE
Are all LED indicators off in GEE?
Check power to GEE cabinet
Yes
Is the Proceed fail/inhibit Yes LED (1) illuminated on both sides
Check Master sync PCB. Note. Sync LED will only be illuminated if a fault is present. Refer to Master Sync FAT test.
No Is the Proceed fail/inhibit LED (1) illuminated on one side
Yes Replace the oscillator PCB, if this doesn’t solve the problem replace the slave sync PCB.
Possible connection fault between GEE cabinets. (Refer to Vehicle Fig 6 System Oscillator) .This shows the interconnections of No Diverging – the ‘sync’ signal between GEEs.
Yes
Retest and repair faulty PCB
Has Fault been rectified?
Loops Behind Released
Commercial In Confidence
Page 13 of 13 6th August 2008
Description 1 2
Screwdriver set
3 4
security hex/torx bits
5 6 7 8
Allen key set (metric)
Crimp gun for connectors Crimp gun for ferrules
Part no.(If required) Standard set Standard set Standard set Tyco crimps Grip on 912.07 Standard
DVM Ferrell crimps
1.1. Tools required for Maintenance and Repair
10. Fault Diagnosis Under normal operation conditions and with no vehicle present all the ‘Proceed LEDs should be illuminated in the GEE cabinets. This is with the exception of some GEE boxes situated on the roundabout were the yellow inhibit LED is on permanently on the in fills, merges and diverges. The fault diagnoses should be carried out using the ATS trolley with the Redcliffe monitoring system. The proceed signals may be lost momentarily as the receivers approach loop boundaries, this is normal and should be expected. Only when the proceed /speed signals are lost for a sustained section of the loop will indicate a problem. The trolley should be pulled along the guideway and the six measurements visually monitored. Checks should be made for loss of proceed signal strength (F1 & F2). The signal strength should never fall below 1000 mV anywhere on the guideway The signal strength on the roundabout will be lower than that of the straight sections due to the wider loop widths on the merges and diverges. Measurements on the trolley differ to those of the vehicle, so these measurements are for indicating faults, not for accurate readings. Commercial In Confidence
Page 1 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
The vehicle box and monitoring system can be remove from the trolley and fitted to an ATS vehicle in order to obtain more accurate measurements. Note. This procedure should be carried out whenever a repair or calibration is completed
Monitor System Faults The support required here is to process and relay on to Central Control the alarm messages provided by the AVP. The messages can be processed to locate faulty loops by: •
Vehicle undetected - noting gaps in the ‘Loop Occupied’ sequence as the vehicle passes and/or appearance of the ‘Detector Fail’ signal.
•
Loops not transmitting – no ‘Proceed On’ signal from one or more loops when not inhibited, and/or appearance of the ‘Proceed Signal/Inhibit Fail’ signal.
•
Failure to inhibit loops correctly – no or spurious ‘Loop Inhibited’ signals when expected, and/or appearance of the ‘Proceed Signal/Inhibit Fail’ signal. Listed below are the faults that could be detected by the control room.
Loop Faults Fault No. 1 2 3 4 5 6 7 8 9
Description Fails to detect Vehicle False vehicle detection Fails to Inhibit False Inhibits False Proceed signal (Same as 3) No proceed signal Monitoring signal fault with no fault in functionality Speed limit incorrect False Alarm.( Alarm activates with no real fault)
Flow diagram Reference. 17.7 17.6 17.7,17.12 17.4 17.7,17.12 17.4,17.8,17.12 17.11 17.10 17.11
GEE faults
Fault No 1 2 3 4
Description Fails to detect vehicle on one side Fails to proceed on one side Interface Failure(Any inter GEE inhibits, Power down inhibit or sync failure Master sync Failure
Commercial In Confidence
Flow Diagram Reference 17.7 17.9 17.8 17.3,17.8
Page 2 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Vehicle Faults
Fault No. 1 2 3 4 5
Description Fails to transmit presence signal( Vehicle undetected) Faulty Speed signal provided False proceed or speed signal No proceed or speed signal Incorrect speed signal
Commercial In Confidence
Flow Diagram Reference 17.7 17.1 17.11 17.9,17.12 17.10
Page 3 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
17.2.Flow Diagram of Proceed Signal Inhibit Fault on one Loop control PCB
Proceed signal/ Inhibit fail LED 1 illuminated on one Loop control PCB
Remove suspect Loop controller PCB using red eject lever and replace with spare Loop control PCB
Yes
Has fault gone?
Loop Control PCB faulty
No From 17.6 17.2(a)
Turn the rack 90º to gain access to backplane Ref 12.1.1
Unplug the preamp plug associated with the suspect loop control PCB. Unplug the next preamp plug along and swap the two over
Has the fault moved from the original loop control PCB to the next one along?
No
Connection problem between Loop control PCB and backplane
Yes Preamp cable, preamp or loop connection problem. Remove the GRP lid to gain access to the suspect Preamp box.
CONTINUED
Are connections on TB1 & J1 on preamp secured?
No
Secure connectors and check for fault condition
Yes
Has gone?
Yes
Commercial In Confidence
Connection problem
Page 4 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Preamp PCB fault
Yes
Open preamp box
No
(Ref 13.1.5) Replace preamp. Has fault gone from loop control PCB?
No
Check continuity of preamp cable and crimped connectors
17.3Flow Diagram of Proceed Signal Inhibit Fault on all Loop control PCB
PSIF: Proceed signal/Inhibit Fail Proceed signal/ Inhibit fail LED (1) illuminated on all Loop control PCBs in GEE cabinet on side ’A’ or side ’B’ or both
Yes Are PSIF LEDs illuminated on sides A & B?
Commercial In Confidence
Check next GEE box Upstream. Are all PSIF LED s illuminated on sides A or B? th
Page 5 of 13 6 August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
No Replace Slave Sync PCB. Has fault gone? Replace Master Sync PCB Refer to FAT test
Yes
No
Slave Sync PCB fault. .Refer to FAT test
Replace Oscillator coder PCB.
Yes
Oscillator Coder PCB fault. Refer to FAT test
Has fault gone?
17.4.Flow Diagram of False Inhibit Fault on Loop Control PCB One inhibit LED illuminated with no vehicle in close proximity
Remove the next 2 Loop control PCBs to the right of the inhibited one
Is the Loop PCB still inhibited?
No
Fault with one of the adjacent Loop control PCB. Refer to Loop Control FAT test
Yes Replace suspect Loop PCB with spare
No Is the Loop PCB still inhibited?
Yes
Fault with Loop Control PCB. Refer to FAT test
Commercial In Confidence
Page 6 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Is suspect loop PCB associated with an impact switch?
Reset impact switch
Yes
No
Note: If backplane is of the configurable type check for broken connections on the back. Ref 10703-LK- GEExxx
Possible Backplane connection problem. Refer to 13.1.3 to replace backplane.
17.5.Flow Diagram of Detector Fail LED fault on Loop Controller PCB
Is the Detector fail LED permanently illuminated on the Loop control PCB?
No
Is other side operation correctly?
No
Flashes on occasionally This may not be a problem please refer to Redcliffe
Determine fault with other side
Yes Swap suspect Loop control PCB with Yes spare
Has Detector fail LED gone out?
Is fault still present?
No
Please refer to Redcliffe
Yes Loop control PCB fault
Commercial In Confidence
Page 7 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
17.6.Flow diagram of False Occupied fault on Loop Control PCB.
Occupied LED (5) illuminated on loop control PCB with no vehicle present
Replace suspect loop PCB with spare
Has fault gone?
Yes
Fault with Loop control PCB Please refer to Loop Control PCB FAT test
No Use Preamp test box to check preamp wiring and preamp
Yes Is preamp functioning correctly?
Please refer to Redcliffe
No Problem with Preamp/wiring Refer to flow diagram 17.2 (a)
17.7.Loop control PCB Fails to Detect Vehicle on one side Commercial In Confidence
Page 8 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd Loop control PCB fails to detect vehicle entering loop (on one side)
No
Proceed signal/ inhibit fail LED (!) illuminated see 15 Detect Fail LED (2) Illuminated see 15.
With no vehicle present Only Proceed LED (4) should be illuminated
Inhibit LED (3) Illuminated see 15.
Yes
Position ‘Test trolley’ (Ref 15.1) over suspect loop. Only the proceed LED (4) and the Occupied LED (5) should be illuminated
Problem with Vehicle board. Please refer to Vehicle PCB FAT test
No
Replace Loop
Yes
Control PCB.
Faulty Loop controller PCB
Is test trolley detected?
No Problem with pre-amp or wiring. Please refer to flow diagram 15.2 (a)
17.8.Pre-amp faults Gain of Preamp too high If the gain of the preamp has become too high it is possible for the preamp in that loop to detect a vehicle too early and inhibit itself. This faults would cause a dropout of proceed signal on that side. This fault could also affect loops in close proximity such as at merges and diverges. Gain of Preamp too Low The vehicle may lose the proceed signal in the loop controlled by the faulty preamp.
Commercial In Confidence
Page 9 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Faults between GEE Cabinets The system is design that if a fault should occur between cabinets the system would fail safe and permanently inhibit the affected loops.
17.9.Flow diagram of loss of proceed signal on vehicle
Loss of Proceed signal to vehicle
Is there a vehicle
Yes
A head
No
Commercial In Confidence
Provided the vehicle is within minimum headway, the system is inhibiting correctly
Page 10 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Check the status of the loop control PCB associated with the loop at which proceed signal is lost
Yes
Refer to flow diagram 16.4
Is occupied LED (5) illuminated on associated Loop PCB?
No Is ‘lost transmitter alarm’ activated on vehicle PCB? (Ref. Vehicle PCB FAT) test
No Put ‘Txbox’ in loop (ref 15.4)
Yes
Is Occupied LED ILLUMINATED?
The problem is with preamp or associated wiring. Ref 17.6.
Fault with vehicle PCB or Vehicle Transmitter. Check calibration of 1 kHz on vehicle PCB. Refer to Vehicle FAT test
No Replace loop control PCB with spare.
No
If this fault has occurred on a roundabout the problem could be connection problem on configurable backplane
Yes
Fault with loop control PCB. Refer to FAT test
Is occupied LED on?
17.10.Flow diagram for loss of speed signal on vehicle Speed jumpers on back plane incorrect. See 12.1.3 (11.1.3)
Yes
Is Speed signal stable but incorrect
No Loss of speed or unstable speed readings
Are all or most of the loops in one GEE cabinet affected?
No
No
Fault with loop control PCB. Refer to FAT test
No
Yes Fault with Vehicle box or TX/RX units. Refer to FAT test
Yes
Swap associated loop control PCB with spare. Has fault gone?
Use ATS ‘test trolley’ to check speed readings. Are faults still present?
Yes Swap Oscillator PCB with Spare.
Commercial In Confidence
Change preamp (ref 13.1.5 preamp removal) Has fault gone?
Preamp fault. Refer to FAT test
No Refer to Redcliffe
Page 11 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
Speed signal ok?
No
Yes Suspect Oscillator PCB requires calibration. Refer to FAT test
17.11.Monitoring signal fault with no fault in functionality
Monitoring system detects fault but system functioning correctly. Alarm indicated in control room.
Loop Control PCB Replace the suspect loop Control PCB. Has fault been removed?
Yes
Fault. Refer to FAT test
No
Possible problem with ribbon cable connection on rear of backplane to monitoring box (ref 6.2 for backplane details). Check monitoring box
Commercial In Confidence
Note. A damaged Opto-coupler on the output of the loop control PCB may only show in the control room and not on the PCB itself.
Page 12 of 13 6th August 2008
ATS ULTra Project – Original Equipment Manufacturer Manual for Automatic Vehicle Protection Draft 3 Proprietary to Advanced Transport systems Ltd
17.12.Loss of proceed signal on one or both side
Loss of proceed signal one or both sides of GEE
Are all LED indicators off in GEE?
Check power to GEE cabinet
Yes
Is the Proceed fail/inhibit Yes LED (1) illuminated on both sides
Check Master sync PCB. Note. Sync LED will only be illuminated if a fault is present. Refer to Master Sync FAT test.
No Is the Proceed fail/inhibit LED (1) illuminated on one side
Yes Replace the oscillator PCB, if this doesn’t solve the problem replace the slave sync PCB.
Possible connection fault between GEE cabinets. (Refer to Vehicle Fig 6 System Oscillator) .This shows the interconnections of No Diverging – the ‘sync’ signal between GEEs.
Yes
Retest and repair faulty PCB
Has Fault been rectified?
Loops Behind Released
Commercial In Confidence
Page 13 of 13 6th August 2008
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