Maintenance Instructions for Microcomputer Axle Counting System

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Maintenance Instructions

Az S 350 U

Microcomputer Axle Counting System

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Confidentiality: None Issuing department: TS RA SD 73

Author of German document

Springorum TS RA SD 73, 3063

Translation

released by Argiel TS RA SD 75,

3136 2004-05-10 sgd. Argiel Translation

checked by Müller TS RA SD 75,

3219 2004-05-07 sgd. Müller Translation

prepared by

Argiel TS RA SD 75, 3136

2004-05-05 sgd. Argiel

Name Org. unit, tel. Date Signature

For the original signatures, see the Verification Record with the document number M01100291109, Revision A.

NOTE

The contents of this translation correspond to the German document with the Siemens code number A25552-C605-U1-3-20.

The German document was assessed and released (EBA stamp) by the German Federal Railways Office.

Change List Revision,

sequence Code no.

level

Date of

issue Author Sections

changed Reason,

Change Notice if applicable C, 4 3 2004-02-06 Springorum All Revision

Change documentation for revision C/code no. level 3

Review participants See Review Minutes; M0110237573, A Section Changes/measures

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1 How to Use this Manual

1.1 Scope and Purpose of this Document

These Maintenance Instructions explain the preventive and corrective

maintenance of the new Az S 350 U Axle Counting System from Siemens.

Throughout this document, the axle counting system will be referred to under its short designation Az S 350 U.

The Az S 350 U is operated as a fail-safe computer in a 2-out-of-2 configuration on the basis of the proven SIMIS^ Fail-safe Microcomputer System from

Siemens.

It provides a universal interface for connecting it to any interlocking system. The interface is a parallel interface using floating relay contact outputs and

optocoupler inputs.

1.2 Instructions

This document contains instructions and information on inspection, preventive and corrective maintenance.

The system structure and functions are only described to the extent necessary for preventive and corrective maintenance.

For additional information on the axle counting system, please refer to the Az S 350 U System Description, English version (A25552-C605-U1-*-7629).

Note:

Throughout this document, instructions are marked by an arrow symbol.

Example:

⇒

Set the switches of the power supply boards to "I".

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1.3 Pictograms Used

The safety information in this document is given to ensure your personal safety and to prevent the system described or components connected from being damaged.

In this document, safety notices and warnings are marked by the following pictograms plus an explanatory text. These pictograms refer to the present documentation as well as to the products themselves and have the following meaning:

DANGER

This pictogram, the signal word "Danger" and the associated text point to dangers which may cause death or personal injury.

S

SAFETY REQUIREMENT

This pictogram, the signal word "Safety Requirement" and the associated text point to requirements resulting from the safety case. They must be observed under any circumstances.

CAUTION

This pictogram, the signal word "Caution" and the associated text point to dangers which may cause destruction of or damage to components, circuit boards or assemblies.

NOTE

This pictogram, the signal word "Note" and the associated text give further details and additional information.

WARNING

This pictogram, the signal word "Warning" and the associated text point to

"electrostatic sensitive devices".

Before touching components marked in this way, always carry out charge equalisation.

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1.4 Qualified Staff

Maintenance work on the Az S 350 U may only be carried out by specially trained staff authorised by the railway operator in question.

Any work which could impair the safety of persons or operation of the Az S 350 U must not be carried out.

S

Work on the Az S 350 U (including ZP 43 E/V) may only be carried out with the approval of the signaller or an authorised person responsible for the track vacancy detection section concerned.

DANGER

Do not carry out any unauthorised modifications to the Az S 350 U.

The maintenance personnel must apply the prescribed safety measures for working in the vicinity of live parts according to VDE 0105, Part 1: Operation of Electrical Installations (only valid in conjunction with VDE 0105, Part 2).

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1.5 Suggestions

Do you have any tips, ideas or suggestions concerning these Maintenance Instructions?

Perhaps you have spotted an error or know how to optimise a procedure?

Please contact us directly. Your ideas and suggestions will be gratefully received.

Address:

Siemens AG TS RA SD 7

Documentation and Translation

P.O. Box 3327 D-38023 Braunschweig Germany

Tel: +49 (0) 531 2 26-30 63 Mr. Springorum Fax: +49 (0) 531 2 26-41 35

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2 Safety Regulations

This section lists the safety regulations to be observed for diagnosis, corrective maintenance, inspection and preventive maintenance of the Az S 350 U.

2.1 Basic Safety Regulations

In order to avoid personnel injuries and damage to equipment, the following safety regulations must be carefully observed. The personnel must be familiar with these Maintenance Instructions in order to ensure accident-free and correct working.

DANGER

When doing work on the Az S 350 U, the applicable regulations of the railway operator as well as the valid statutory provisions on health and safety at work must be observed!

Work on the system may only be carried out by qualified staff!

DANGER

Unauthorised changes to the cabling and the stored programs and data will cause invalidity of the safety case. Safety cannot be ensured any longer.

DANGER

All parts such as counting heads, etc. must not exceed the maximum admissible interference voltage (transient interference of max. 1.5 kV_rms / continuous

interference of max. 250 Vrms according to the valid railway operator regulations).

DANGER

Carry out inspection and corrective maintenance work during intervals between trains only.

NOTE

Keep a fault record when doing corrective maintenance work.

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• Before starting work on the track, carry out the safety measures in accordance with the relevant railway regulations.

• Maintenance work may only be carried out using the approved tools, devices, testing equipment and materials.

After completion of preventive or corrective maintenance work on ZP 43 E/V wheel detection equipment, the following are necessary:

• After preventive maintenance work on an operational system under the following conditions:

− The associated track vacancy detection section (TVDS) had worked correctly before the work began and was indicated as being clear.

− No trains entered the TVDS during work.

⇒

Check the equipment of the TVDS for correct operation. For this purpose you can simulate a local train movement.

• After corrective maintenance work on a faulty system:

The system has to be put back into operation in line with the valid safety regulations of the railway operator and the approval authority. Example:

− The signaller or authorised person must first check the operating department regulations and cancel the reset restriction (RR) with the AzGrH auxiliary axle count reset button and then actuate the AzGrT or vAzGrT button.

− Then wait for the result of the necessary proceed-on-order runs. The proceed-on-order runs must go across all associated counting heads. They are to check the switching capability of the channels.

NOTE

After having carried out corrective maintenance work on circuit boards, no proceed-on-order runs are required from the manufacturer's point of view.

NOTE

When fuses are replaced, the new fuses must have the same electrical values as the ones replaced.

After completion of work on Az S 350 U equipment, make sure that the evaluation

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2.2 Handling of Circuit Boards

S

Only remove or insert boards when the computer is disconnected from power.

Removing and inserting boards in the energised state may damage or destroy circuit boards or computer. Do not commission condensed circuit boards.

CAUTION

All boards marked with the symbol for electrostatic sensitive devices must be handled with special care.

WARNING – Symbol "Electrostatic sensitive device"

Before touching components marked in this way, always carry out charge equalisation in order to prevent discharge via the electronic circuits.

CAUTION

Do not touch board connections, conductors, components or plug connectors.

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Please observe the following when handling circuit boards:

• Only place boards on high-impedance bases which are conductive or have been made conductive (e.g. for example carbonised foam mats).

• Before picking up or placing a board, carry out charge equalisation by touching the base.

• Before removing a board from or inserting a board in a device, frame, cabinet or rack, carry out charge equalisation by touching an uncoated metal part of the device, frame, cabinet or rack.

• Do only touch the edges or front panels of boards.

• Remove boards by their handles only.

• Uninstalled boards must be stored and transported in the packaging at all times.

• If boards are to be handed over from one person to another without their packaging, carry out charge equalisation by touching the hands of the person concerned before handing over.

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3 Structure and Mode of Operation

The Az S 350 U consists of two main components:

• outdoor equipment

• indoor equipment

The outdoor equipment comprises a number of ZP 43 counting heads, in variant E (cast aluminium housing) or variant V (plastic housing), with track vacancy detection sections assigned to them. External wiring also belongs to the outdoor equipment. The indoor equipment consists of the evaluation computer (EC).

These Maintenance Instructions refer to the Az S 350 U as well as the setting of the counting heads via the EC. Corrective maintenance of the counting heads is described in the Operating and Service Manuals for ZP 43 E (A25063-B217-H21-

*-76N9), ZP 43 E for Use at DB AG (A25063-B218-H21-*-N9, available in German only) and ZP 43 V (A25063-B216-H21-*-76N9).

3.1 Structure

Figure 1 Front view of Az S 350 U evaluation computer (including slot numbers) The plug-in boards are accommodated in a single-tier mounting frame with wiring backplane. Dummy boards are inserted into the slots intended for optional

boards.

The SIRIUS2 board (serial computer interface universal board) enables the communication between the evaluation computers connected. It provides two serial, bidirectional interfaces for data transmission, each of them being equipped with a V.24 output. The SIRIUS2 board is used in one channel only.

All inputs and outputs (CI, ¬CI, AzGrT or vAzGrT, RR, RA, user-defined block information) to or from the interlocking are done via the BLEA12 block

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input/output board. Two BLEA12 boards (first pair of BLEA12 boards) are

required for the dual-channel Az S 350 U, one for channel 1 and one for channel 2. A second, optional pair of BLEA12 boards can be inserted.

Each computer channel has a STEU control and diagnostic board, which evaluates the WDE signals received (counting head- and section-specific data).

The VAU processing and monitoring board, a CPU board, is the fail-safe microcomputer (SIMIS C hardware core) of the Az S 350 U. The VAU board provides monitoring and comparator functions for synchronised dual-channel microcomputer operation.

One VESBA amplifier, trigger and band-pass filter board is required per directly connected counting head. It provides electrical isolation between indoor and outdoor equipment (counting head). The VESBA board splits the signal

frequencies f₁ and f₂ into two independent channels and filters, amplifies, rectifies and evaluates (trigger) the data transmitted from the counting head. Each

counting head (CH) has its own VESBA board (CH 1 to CH 5).

The DIGIDO digital double-usage board is used if WDE information is to be jointly used by an Az S (M) 350, version B/M, and an Az S 350 U (digital double usage of a counting head via DIGIDO).

The SVK2150 power supply board provides 5 V for the evaluation computer and 70 V for the counting heads.

Quantity Short designation of board

Description Order no.

1 MF Mounting frame S25552-C605-U1

2 VAU* Processing and monitoring board S25552-B600-U1 2 STEU* Control and diagnostics board S25552-B601-B1 2 or 4 BLEA12* Block input/output board S25552-B603-D1 0 or 1 SIRIUS2 Serial computer interface universal board S25395-B171-A3 0 to 5 VESBA Amplifier, trigger and band-pass filter board S25552-B604-C1 0 or 1 DIGIDO Digital double-usage board S25552-B699-U1 1 SVK2150 Power supply board S25552-B651-C1

* Make up the hardware core: channel 1 or channel 2 – standard configuration: at least one BLEA12 board per channel

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3.2 VAU Board

Processing and monitoring board S25552-B600-U1

VGL = Comparator (yellow LED) SPW = Voltage controller (red LED)

PAB = Program-controlled shutdown (red LED) ANL = Start-up (red LED)

Red button = System reset

VGL SPW PAB ANL

Figure 2 Front view of VAU board

Equipped with 2 MHz 8085 microprocessors, the two VAU boards make up the core of the microcomputer system. They have 8 kB RAM and 32 kB EPROM.

Due to the dual-channel layout of the evaluation computer, there is one VAU board per channel.

The VAU board is a SIMIS C CPU board, in which two independent MES80 microcomputers are connected without additional circuits to form a clock- synchronised dual-channel microcomputer system providing SIMIS core functions.

Each VAU board monitors and compares the synchronous and identical operation of both microcomputers and, in case of a fault, transmits a switch-off control signal (SCS) in order to disconnect the signalling and safety peripherals connected.

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After a system reset, the standard sequence of operations starts on the VAU boards. In order to make both channels start synchronously, both reset buttons on the front panels of the boards must be pressed simultaneously for approx.

1 second.

The SIMIS online test program (SOPP) is started after initialisation. The

complete, interruptible program run takes approx. 4 minutes. The SOPP program is a low-priority program executed in the background and is always quit after an interrupt request.

If both LEDs "VGL" on the VAU boards light up, the evaluation computer is operational. Both synchronously working microcomputers process identical data.

A lit LED "SPW" indicates that the operating voltage is above or below the permissible value of 5 V DC. The system has to be restarted.

A lit LED "PAB" indicates a program-controlled emergency shutdown, i.e. if the comparator has detected asynchronism in the operating system or if, during the continuous test cycles, a safety-related fault has been detected. This initiates a hardware- or software-controlled shutdown and the evaluation computer switches to the occupied state. The system then has to be restarted. The causes of faults can be identified via the LEDs (LED 0 flashing permanently) on the STEU board (see Section 4.4.2 "Emergency Shutdown", page 52).

During evaluation computer start-up, the LED "ANL" lights up for approx. 3 s.

For a synchronous start of the evaluation computer, after a failure, both VAU boards have a system reset button. Pressing both red buttons simultaneously for approx. 1 s will restart the evaluation computer.

Front panel coding 1727 according to C25117-A55-A1-*-18

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3.3 STEU Board

Control and diagnostic board S25552-B601-B1

The control and diagnostic board buffers the signals transmitted by the counting heads. Due to the dual-channel layout of the evaluation computer, there is one STEU board per channel. The LEDs on this board display the following:

• normal display: display of operating states of the four track vacancy detection sections (TVDS) (during operation; operating state display)

• statistics display (diagnostics): display of operating states for a certain counting head or track vacancy detection section (switchover/selection via AzGrH button)

• display after emergency shutdown: display of operating states in case of emergency shutdown

Front panel coding 897 according to C25117-A55-A1-*-18 3.3.1 Normal Display

Lit LEDs 2 xx

0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

0 - System reset performed, pressing of AzGrT required 1 - Minus axle blocking effective;

counting capacity exceeded;

undefined couting pulse 2 - Count monitoring

3 - Faulty telegram transmission between evaluation computers or the second evaluation computer is shut down 4 - Reset restriction (RR) effective 5 - Section occupied, axle count not equal to 0 or another LED is on

6 - As for LEDs 0 to 5 of TVDS 1

7 - "

8 - "

9 - "

10 - "

11 - "

2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn. Display TVDS 1 Display TVDS 3 STEU 1 Channel 1 (left board) 2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn. Display TVDS 2 Display TVDS 4 STEU 2 Channel 2 (right board) TVDS 4 not configured Display of telegram transmission state Meaning of LEDs for TVDS 1 Meaning of LEDs for TVDS 3 Lit LEDs 0 - As for LEDs 0 to 5 of TVDS 1 1 - "

2 - "

3 - "

4 - "

5 - "

6 - As for LEDs 0 to 5 of TVDS 1 7 - "

8 - "

9 - "

10 - "

11 - "

Meaning of LEDs for TVDS 2Meaning of LEDs for TVDS 4

TVDS 4 not configured 7 - LED 7 to 9:

8 - Display of telegram 9- transmission state

Figure 3 Front view of STEU board; display of operating states for TVDS 1 to 4

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NOTE

The meaning of LED 4 (reset restriction) is only applicable to the AzGrT mode.

In the vAzGrT mode LED 4 is permanently off.

Meaning of LEDs on the STEU board (normal display)

LED display

! = steady l.

☼ = flashing

Meaning Cause Effect Remedy

LED 0 = ! System reset • Hardware reset:

Reset buttons on VAU boards have been pressed

• Power supply switched on

• EC in permanently

occupied state • Obtain track clear indication via visual inspection

• Press AzGrT button after reset

LED 0 = ☼ Program-controlled

emergency shutdown • EC fault resulting in asynchronous operation of the two channels

• AzGrT button has been pressed on one or both channels during hardware reset

• Asynchronism of block information

• For further possible causes see Section 4.4.2 "Emergency Shutdown", page 52

• Program-controlled shutdown of EC results in permanently occupied state

• Program is caught in an endless loop

• On both VAU boards, the LEDs

"VGL" are switched off and the LEDs

"PAB" are switched on

• Remove cause of fault

• Carry out hardware reset

• Obtain track clear indication via visual inspection

• Reset EC by pressing the AzGrT button

Minus axle blocking

effective • At least one axle more counted out than has been counted in

• Permanently occupied state caused by minus axle blocking

Counting capacity exceeded

(max. 32,767 axles)

• Incorrect programming of counting direction of a counting head

• Counting head counting out is faulty

• Counting head maladjusted

• Permanently

occupied state • Remove cause of fault

LED 1 = !

Undefined counted

pulse • Inexplicable pulse

detection by • Permanently

occupied state • Obtain track clear indication via visual

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LED display

! = steady l.

☼ = flashing

Count monitoring double wheel detector traversed on one channel only (e.g. shunting movement)

– • Permanently

occupied state without counting

• Occupied state and display are maintained until next complete traversal of double wheel detector or next AzGrT operation LED 2 = ! –

Count monitoring counting head fault due to spurious pulse

• Double wheel detector, after complete traversal, detected pulses on one channel only (more than 4 ms)

• Double wheel detector, during a traversal, detected pulses due to spurious pulse (more than 4 ms)

• Double wheel detector, without a traversal, detected pulses due to spurious pulse (more than 4 ms)

• Counting error leading to a permanently occupied state

• No counting error; if at least one axle follows after the cause, the track clear indication will be given after the train has passed, display is switched off

• Occupied state without a train;

occupied state and display are maintained until next traversal with track clear indication or until next AzGrT operation

• Check counting head concerned including cable

LED 3 = ! Telegram

transmission faulty or switched off

• Data transmission between ECs is faulty

• Second EC has been switched off

• Second EC is in emergency shutdown state

• Data transmission between ECs was faulty (DIP switch TELFM is set to Off and double wheel detector detected no pulses)

• As long as the connection is interrupted or faulty data is received, the TVDS with

“remote” counting heads remain in the occupied state

• Occupied state and display are maintained until next complete traversal of double wheel detector or next AzGrT operation (DIP switch TELFM set to Off)

• Check connection between the ECs

• Check whether second EC has been switched off or is in an emergency shutdown state (restart)

• Wait for train run;

if TVDS remain occupied, perform the measures above

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LED display

! = steady l.

☼ = flashing

Reset restriction (RR) • One counting head of the TVDS detected pulses

• There are axles in the TVDS

• Time frame for simultaneous AzGrT operation exceeded (single- channel operation)

• RR effective and

section is occupied • Cancel RR via AzGrH button after section clear proving (according to railway operator regulations)

• If time frame was exceeded, restart EC (after consultation with signaller) LED 4 = !

Reset restriction (RR) • Issue of track clear indication for TVDS via AzGrT operation

• RR effective and the section is clear

–

Section occupied • There is a train in the section which has not yet been counted out (axle count ≠ 0)

– • Obtain track clear indication via visual inspection

LED 5 = !

Section remains

occupied • Axle count ≠ 0 e.g. due to counting error

– • Reset EC by

pressing the AzGrT button

LED 6 = ! to LED 11= !

Meaning as for LED 0 to LED 5

See above See above See above

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Meaning of LEDs on the STEU 2 board, slot 57, if TVDS 4 is not configured (normal display)

LED display

! = steady l.

☼ = flashing

LED 7 = ! Telegram transmission via interface 1 is faulty

• Cause as for LED 9, relating to interface 1

• Effect as for LED 9, relating to interface 1

• Remedy as for LED 9, relating to interface 1 LED 8 = ! Telegram

transmission via interface 2 is faulty

• Cause as for LED 9, relating to interface 2

• Effect as for LED 9, relating to interface 2

• Remedy as for LED 9, relating to interface 2 LED 9 = ! Telegram

transmission is faulty • General: Data transmission between ECs is faulty

• Second EC has been switched off

• Second EC is in emergency shutdown state

• Data transmission between ECs was faulty (DIP switch TELFM is set to Off and double wheel detector detected no pulses)

• As long as the connection is interrupted or faulty data is received, the TVDS with

“remote” counting heads remain in the occupied state

• Occupied state and display are maintained until next complete traversal of double wheel detector or next AzGrT operation (DIP switch TELFM set to Off)

Only necessary if a TVDS is affected:

• Check connection between the ECs

• Check whether second EC has been switched off or is in an emergency shutdown state (restart)

• Wait for train run;

if TVDS remains occupied, perform the measures above

3.3.2 Statistics Display/Diagnostics

NOTE

Display and selection are described in Section 4.3 "Statistics Functions/Diagnostics", page 33, as a part of diagnostics.

3.3.3 Display after Emergency Shutdown

NOTE

The display is described in Section 4.4.2 "Emergency Shutdown", page 52, as a part of diagnostics.

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3.4 BLEA12 Board

Block input/output board with 12 relay outputs S25552-B603-D1

T1

T2

T3

T4

Figure 4 Front view of BLEA12 board (left), front connector with buttons (right) The BLEA12 board is the input/output interface of the AZ S 350 U. It has 12 floating relay outputs and 12 floating optocoupler inputs. Inputs and outputs are made via a 48-pin connector on the front panel of the board.

The BLEA12 is a single-channel board. This is why the dual-channel Az S 350 U system uses two boards of this type, one in channel 1 and one in channel 2 (first pair of BLEA12 boards). A maximum of four track clear/occupied indications with the associated reset restriction (RR) and reset acknowledgement (RA) can be output. The remaining inputs and outputs can be used for freely configurable, operator-specific information (e.g. block information). If the outputs are not required for track vacancy detection, a maximum of 12 freely configurable, operator-specific items of information can be implemented.

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Optional front connectors with four buttons (T1 to T4) on the first pair of BLEA12 boards implement the auxiliary axle count reset button (AzGrH). By a dual- channel operation of the buttons, the reset restriction can be cancelled for each track vacancy detection section. By pressing only one of the two AzGrH buttons (single-channel operation for a configured track vacancy detection section), the normal display of the STEU boards is switched over to statistics display/

diagnostics.

An optional pair of BLEA 12 boards (second pair of BLEA12 boards) can be inserted for additional functions. If the outputs are not required for track vacancy detection, a maximum of 24 freely configurable, operator-specific items of information can be implemented.

The operator-specific input data is read in via floating optocouplers inputs under conditions of electrical isolation. The input optocoupler circuit is designed to permit input voltages from 21.6 V to 72 V DC. The operator-specific output data is output via two floating relay contacts.

The BLEA12 board has a MES80 bus port, which is used for exchange of data with the VAU board. The BLEA12 board also provides the port for the SCSI internal switch-off control signal, which can be used to switch off the power supply of the output relays.

The BLEA12 board executes the following functions:

• output of track clear/occupied indication (CI and ¬CI) of up to four TVDS

• output of reset restriction (RR) of evaluation computer for each TVDS

• output of reset acknowledgement (RA) on successful axle count reset for each TVDS

• input of immediate or preparatory axle count reset (by actuating the AzGrT or vAzGrT button) for each TVDS of the evaluation computer

• input of cancellation of reset restriction (RR) by actuating the AzGrH button for each TVDS via optional front connector

• configuring by means of 96 DIP switches

• block inputs/outputs for freely configurable, operator-specific information The output of a track clear indication (CI) or an inverted signal (track occupied indication, ¬CI) is issued for each track vacancy detection section via floating relay contacts. The BLEA12 board can output indications for up to four TVDS (equivalent or non-equivalent).

The relay output system for the output of the track clear/occupied indications is of dual-channel design, i.e. the output data is generated and output on each of the two computer channels. To this end, each computer channel has two relays. The

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relay contacts are linked to form two contact chains (one normally-open contact chain and one normally-closed contact chain or two normally-open contact chains). The outputs have to be linked and evaluated by the higher-level

interlocking system, i.e. they have to be checked as to their equivalence or non- equivalence, depending on the configuration.

Non-equivalent output

Equivalent output

Channel 1 Channel 2

C1 C2 C3

C4

C1 C2 C3 C4

Channel 1 Channel 2

Figure 5 Output variants

Thus, in the dual-channel Az S 350 U, four relays contribute to each fail-safe output (track clear/occupied indications and freely configurable, operator-specific information). It can be assumed as being fairly unlikely that these four relays will ever fail in a way that leads to a dangerous failure.

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Indications:

clear/occupied e.g. relay circuit

BLEA12 board

Interlocking

V = 60 V DC

0 V

Az S 350 U

V ^Chan

nel 2 Channel 1

Figure 6 Example of a relay circuit with double-cut

Depending on the program revision level of the VAU board, the slot assignment of the BLEA12 boards may differ (see Section 5.4.2 "Special Conditions for BLEA12 Board").

Front panel coding no.: 17 04 according to C25117-A55-A1-*-18 Front connector coding: application-related

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3.5 SIRIUS2 Board

Serial computer interface universal board S25395-B171-A3

Figure 7 Front view of SIRIUS2 board

For controlling the transmission system (data transmission between evaluation computers), the Az S 350 U has a SIRIUS2 board.

The SIRIUS2 board provides two serial, bidirectional interfaces for data

transmission, each of them being equipped with a V.24 output. One of these V.24 interfaces has two control signals (RTS1 and CTS1).

The SIRIUS2 board contributes to fail-safety by providing reliable electrical

isolation between peripherals and hardware core. For the transmission of fail-safe data, the procedure-protected data transmission procedure FASIT (fail-safe, single-channel transmission of status information) is used.

On the front panel, there is a 48-pin connector providing the connection for all interface signals.

Front panel coding no.: 14 56 according to C25117-A55-A1-*-18 Front connector coding no.: 1 04 according to C2311-A55-A35-*-18

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3.6 VESBA Board

Amplifier, trigger and band-pass filter board S25395-B604-C1

System 1

LED (yellow) lights up if system 1 of double wheel detector is being traversed or occupied (or V₁ < 1.3 V DC)

Potentiometer for voltage adjustment V1 = 3.0 V DC ± 0.10 V

Measuring socket for signal frequency f1 = 3.60 kHz ± 0.05 kHz (frequency adjusted at CH) Measuring socket for voltage V1 = 3.0 V DC ± 0.10 V

0 V measuring sockets for both systems System 2

Measuring socket for signal frequency f2 = 6.52 kHz ± 0.10 kHz (frequency adjusted at CH) Measuring socket for voltage V2 = 3.0 V DC ± 0.10 V

LED (yellow) lights up if system 2 of double wheel detector is being traversed or occupied (or V2 < 1.3 V DC)

Potentiometer for voltage adjustment V₂ = 3.0 V DC ± 0.10 V

Si 1 0,2A

F/U

F/U 0 V

U U

..

Counting head (systems 1 and 2 of double wheel detector) Counting head fuse (0.2 A)

Figure 8 Front view of VESBA board

The functions of the VESBA amplifier, trigger and band-pass filter board are as follows:

• connection of ZP 43 E/V wheel detection equipment (counting heads)

• forwarding of power supply (from SVK2150) to counting heads

The counting head is connected to the Az S 350 U via a two-core cable. There are additional outputs on the VESBA board allowing to set up a digital double- usage interface.

The VESBA board provides electrical isolation between outdoor equipment (counting head) and indoor equipment. It splits the signal frequencies f1 and f2

into two independent channels and filters, amplifies, rectifies and evaluates (trigger) the data transmitted from the counting head.

The front panel incorporates measuring sockets for fault diagnosis, LEDs for displaying the traversal state and potentiometers for adapting to different cable lengths and setting the transmission levels.

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When the yellow LEDs on the front panel light up, they indicate that a train is traversing or occupying the track-installed wheel detector. In normal operation, these LEDs light up shortly depending on the speed of the train.

If one of the LEDs is permanently on, there is probably a wheel at the position where the wheel detector is mounted. If this is not the case, a fault can be assumed. The LEDs light up if no counting head is connected or if the voltage supply for the counting head is not present, interchanged or maladjusted

(V < 1.3 V or counting head connected incorrectly). Approx. 60/70 V DC must be measured at the terminals for the counting heads. If no voltage is measured, the fuses must be checked.

The counting heads are protected via fuse Si 1, which is mounted directly on the front panel, and another fuse on the printed circuit board.

Comb coding no.: 6 55 according to C25117-A55-A3-*-18

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3.7 DIGIDO Board

Digital double-usage board S25552-B699-U1

Figure 9 Front view of DIGIDO board

The optional DIGIDO board is used to switch through the digital axle signals between the Az S (M) 350 Version B/M and the Az S 350 U. For digital double usage (from and to other systems) either the digitised WDE signals of the directly connected counting heads as transmitting counting heads can be used or the digitised WDE signals of another evaluation computer are used instead of the directly connected counting heads.

The DIGIDO board performs two functions:

• The digital axle signal (TTL level) coming from the VESBA board (Az S 350 U) is inverted, decoupled via an optocoupler and forwarded to the STEU board of the Az S (M) 350 Version B/M via an IMA module.

• The digital axle signal (TTL level) coming from the VESTI board

(Az S (M) 350 Version B/M) is inverted, decoupled via an optocoupler and forwarded to the STEU board of the Az S 350 U.

Front connector coding no.: 3001 according to C25117-A55-A1-*-18

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3.8 SVK2150 Power Supply Board

Power supply board S25552-B651-C1

SVK2150

12 V

I

0 ON/

OFF On/Off switch for power supply board

0,1 AF

5 V 70 V V_in

Yellow LED: 12 V Not used in the Az S 350 U Yellow LED: 5 V

Yellow LED: 70 V Yellow LED: V_in Fuse: 0.1 A (fast)

Computer voltage present WDE supply voltage present Input voltage present

Figure 10 Front view of SVK2150 power supply board

The SVK2150 board converts the interlocking voltage into controlled voltages of 5 V DC for the computer, 12 V DC (not in use) and 70 V DC for WDE supply. All voltages are monitored by voltage controllers. Input and output voltages are electrically isolated.

The SVK2150 board is ready for operation when voltage is applied to the

switching input. This is indicated by the yellow LED "V_in". When the switch on the front panel is set to "I", the yellow LEDs "5 V" and "70 V" ("12 V" is not used) indicate the presence of the voltages.

In case of undervoltage, the output voltage is switched off. When the output voltage is missing, the control-circuit fuse (fuse 0.1 A; fast) on the front panel blows. The unit cannot go back into operation until this fuse has been replaced.

If there is no voltage at all, the input fuse on the printed circuit board (fuse 8 A;

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The SVK2150 power supply board supplies voltage for up to five counting heads connected. Terminal strips connected to the SVK2150 ensure electrical isolation between indoor and outdoor equipment. Counting heads 4 and 5 may also be supplied from another voltage source, e.g. directly from the interlocking battery.

On the wiring backplane, terminal strips are available for connecting counting heads 4 and 5, the corresponding connections being established via jumper wires.

Comb coding no.: 2 09 according to C25117-A55-A3-*-18

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4 Diagnostics

4.1 Fault Indication

Track sections whose track vacancy detection equipment is faulty are indicated as being occupied in the control room. After detecting the fault or failure, the signaller (or authorised person) informs the maintenance staff.

4.2 Troubleshooting (Indoor Equipment)

• Troubleshooting should start in the indoor equipment (evaluation computer).

• Record and evaluate the current operating state displays.

• If the fault could not be eliminated by means of an axle count reset operation by the signaller (or authorised person), press the AzGrH button on one channel in order to activate the statistics functions and record and evaluate the statistical data. For further details, see Section 4.3 "Statistics

Functions/Diagnostics", page 33.

• To pinpoint the causes of counting errors, remeasure the signal frequencies f₁ of 3.60 kHz (tolerance range from 3.55 kHz to 3.65 kHz) and f2 of 6.52 kHz (tolerance range from 6.42 kHz to 6.62 kHz) at the measuring sockets "f₁" for 3.60 kHz and "f₂" for 6.52 kHz. In addition, remeasure the output voltages V₁ (3.0 V DC) and V₂ (3.0 V DC) at the measuring sockets "U" of the VESBA board. The values must lie within the admissible tolerance range (2.90 V to 3.10 V).

If the signal frequencies f₁, f₂ and the voltages V₁, V₂ are within the admissible tolerance range, the cause of fault is most probably to be found in the evaluation computer.

If the voltages are outside the admissible tolerance range, check the counting head. If the counting head proves fault-free, check the transmission path (cable).

If the signal frequencies f₁ and/or f₂ are outside the admissible tolerance range, check the counting head.

Before checking the outdoor equipment, check whether the fuse on the VESBA board (0.2 A) in the evaluation computer is fault-free and if there is WDE supply voltage present in the indoor equipment. The tests are carried out with the FTGS/GLS/AZS test unit (PEGA 1211), the test adapter board for ZP 43 E/V in conjunction with a multimeter or the WDE diagnostic unit (no longer available)

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4.3 Statistics Functions/Diagnostics

NOTE

The diagnostic mode is exclusively activated via a single-channel AzGrH operation!

A dual-channel AzGrH operation results in an occupied indication for the TVDS!

STEU 1 Channel 1 (left board)

STEU 2 Channel 2 (right board) 2xx

0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

2xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

LEDs for statistics function selection

STEU 1 Channel 1 (left board)

STEU 2 Channel 2 (right board) 2 xx

0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

2 xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

Display of statistics function selected Display of result

for selected statistics

function

LEDs for display of results

LEDs for object selection

Select with AzGrH button

Result

Display of object selected

(CH, TVDS, block information or system information selectable)

Figure 11 Front view of STEU board; statistics display

Single-channel operation of the auxiliary axle count reset button (AzGrH) connected with the BLEA12 board switches the STEU boards from normal to statistics display. The LEDs on STEU 2 to the right (slot 57) show the selectable options. The object selection menu consists of two groups of five LEDs each. The upper LED group (LED 1 to LED 5) displays the type of object selected, the lower group (LED 7 to LED 11) displays the statistics function selected. The result of the selection is displayed (directly or in binary code) on the STEU 1 board to the left (slot 27, LEDs 0 to 11).

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4.3.1 Selection

The statistics display (for diagnostic purposes) is activated by pressing one of the two AzGrH buttons for about 3 s (single-channel operation, use TVDS 1 button).

Activating statistics display (default display) after system start:

Press AzGrH (for approx. 3 s, use TVDS 1 button)

Display on STEU 2

LED display

! = on (steady light), selection possible

☼ = flashing, selection not possible

Object currently selected

Result displayed on STEU 1

Activating

statistics display Object selection enabled (default)

LED 1 = !

LED 7 = ☼ CH 1: object

selection enabled;

statistics function not selectable

Statistics function: axle count for CH 1;

(default)

2 xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

STEU 2 STEU 1

2 xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

Selection:

statistics function 1

7

One or more LEDs on:

selection possible - object selection enabled;

CH 1 selected

Object can be selected

One or more LEDs flashing:

selection not possible Statistics function cannot be selected

CH TVDS Block info System info

Figure 12 Display on STEU 2 board; starting the statistics display

After system start-up and subsequent switching to statistics function display, the default setting is applied. LED 1 is permanently on, the object selection on the right STEU 2 board is enabled, and LED 7 is flashing (statistics function selection currently not possible).

NOTE

The AzGrH button connected to the BLEA12 board in slot 71 or 63 (see Section 5.4.2 "Special Conditions for BLEA12 Board") permits you to jump forward. To jump back, use the AzGrH button connected to the BLEA12 board in slot 11.

The user is guided through the object selection procedure by LEDs being permanently on (selection enabled/item selected) or flashing (selection not possible/item not selected).

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The object selection option allows to obtain statistical information either on a certain counting head (CH 1 to CH 5) or a certain track vacancy detection section (TVDS 1 to TVDS 4). Further selectable objects are block info (input, output, block information distribution) and system info (e.g. software version). By

pressing the AzGrH button shortly (≤ 1 s), you can switch between the selectable objects.

Switching from CH to TVDS within the object selection menu:

Press AzGrH several times (≤ 1 s)

Display on STEU 2

LED display*

Object currently selected: CH

Object selection enabled

LED 1 = ! LED 7 = ☼

CH 1: Object selection enabled;

Statistics function: axle count for CH 1

Switching from CH to TVDS

LED 1 = ! LED 5 = ! LED 7 = ☼

TVDS 1:

Object selection enabled;

Statistics function: axle count for TVDS 1

*The description of the column >LED display< can be found in Section 4.3.2 "LED Display Tables for Selection Options".

2 xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

STEU 2 STEU 1

2 xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

Selection:

7

selection possible - object selection enabled;

switched to TVDS 1

Object can be selected

One or more LEDs flashing:

selection not possible Statistics function cannot be selected

CH TVDS Block info System info 5

Figure 13 Example of display on STEU 2 board; TVDS 1 selected

By repeatedly pressing the AzGrH button within the object selection menu, further objects can be selected. The corresponding LEDs will light up. Example: LED 1 and LED 5 being permanently on indicates that TVDS 1 has been selected.

Further selections are possible by actuating the AzGrH button again (≤ 1 s).

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After object selection is terminated, the type of statistical information to be displayed for the CH, TVDS, block info or system info can be selected by pressing the AzGrH button for > 1 s ≤ 3 s.

Switching from object selection to statistics function selection:

Press AzGrH

(> 1 s ≤ 3 s) Display on STEU 2

LED display*

Object currently selected: CH

LED 1 = ! LED 7 = ☼

CH 1: Object selection enabled;

Statistics function:

axle count for CH 1

Switch to select statistics functions for CH

Statistics function selection enabled

LED 1 = ☼ LED 7 = !

CH 1: Object selection disabled;

statistics function selectable, function type 1 currently selected

Function type 1; axle count for CH 1 since last system start- up

*The description of the column >LED display< can be found in Section 4.3.2 "LED Display Tables for Selection Options".

Object cannot be selected

Statistics function can be selected

selection possible - statistics selection enabled;

function type 1 for CH 1 selected One or more LEDs flashing:

selection not possible - object CH 1 selected 2 xx

0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

STEU 2 STEU 1

2 xx 0 1 2 3 4 5 6 7 8 9 10 11 Diagn.

Selection:

CH TVDS Block info System info 1

Figure 14 Example of display on STEU 2 board; switching to statistics functions LED 7 being permanently on means that function type 1 has been selected.

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(watch the LED display). Pressing the AzGrH button for a longer time (> 1 s ≤ 3 s) will bring you back to the object selection menu.

If the AzGrH button is pressed for more than 3 s, the system quits the statistics selection function and the display on the STEU board returns to 'normal'.

4.3.2 LED Display Tables for Selection Options

The display and meaning of the selection options on the STEU board are explained in the following LED display tables:

• Object selection – CH

• Object selection – TVDS

• Object selection – block info

• Object selection – system info

• Statistics function options

• Meaning of statistics function types – CH

• Meaning of statistics function types – TVDS

meaning after selection of function type 2 – operating state

• Meaning of statistics function types – block info

• Meaning of statistics function types – system info

2xx 0 1 2 3 4 5 6 7 8 9 10 11 D iagn.

ST EU2 ST EU1

2xx 0 1 2 3 4 5 6 7 8 9 10 11 D iagn.

Selection:

Statistics function

1 C H

T VDS Block info System in fo

Press AzG r H

7 0

2 3 5

LED n o. LED dis pla y:

1 2 3 4 5

C H s el ect ed 1 2 3 4 5

O bject s elec tion - C H

O bject s elec tion - T VD S

Statistics function options

M eaning of stat

Maintenance Instructions for Microcomputer Axle Counting System