Whiteley Electronics PETS-2 User manual

© WHITELEY ELECTRONICS LTD. 1998
Filename:G42278final.doc
PETS-2
Crossing Telephone System
Quickfix Installation Guide
Whiteley Electronics Ltd.,
Victoria Street,
Mansfield,
NOTTS. NG18 5RW
TEL: [phone]
FAX: [phone]
e-mail: [e-mail]
AUTHOR: S. RADFORD
DOCUMENT No: G42278
APPROVED BY:
DATE: 13/12/1999
ISSUE:
Professional Light & Sound Association
2
part of the group of companies

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WARNINGS
HAZARDOUS VOLTAGES
PETS 2 is to be powered from a telecommunications quality dc supply, nominally 24V dc or
50V dc (subject to internal configuration). The 50V dc supply must be treated as a hazard
as it exceeds the levels specified within the ‘Low Voltage Directive’.
Furthermore, whilst 24V dc supplies are considered to be ‘ELV’, PETS 2
incorporates a dc-dc converter that produces a 60V dc level, and can
additionally generate telephone ringing voltages in the order 120V peak to
peak. The circuits within PETS 2 must be treated as hazardous under all
circumstances, and the power supply (mains and battery) should be isolated before removal
of equipment covers.
PROTECTIVE EARTH
The PETS 2 equipment must be earthed, but care must be taken to use a ‘local’ earth for
safety reasons. In most instances the equipment case will be bonded to
‘Telecommunications earth’ by connecting the ‘green/yellow’ lead from a tag
on the outside of the case to the earth point within the Junction Box’. The
earth point within the Junction Box will be bonded to an existing
‘Telecommunication earth’, or to a dedicated ground spike. In some
instances the equipment may be fixed to a signalling frame, where the case
will be bonded by connection of the ‘green/yellow’ wire to the appropriate earth of the
signalling equipment. Under these circumstances the ‘Telecommunications Earth’ within the
Junction Box, and the earth reference to the power supply/ electronics will be kept isolated
from the signalling earth.
CAUTIONS
INSTALLATION INSTRUCTIONS
This handbook is supplied with the Signal Box and Crossing PETS 2 equipment, there are
minor differences between these two items and it is important to identify
each item before starting the installation. This handbook is intended to
cover the installation process only. A competent design authority must
undertake a survey of the installation, and shall then provide additional
installation instructions relating to the specific configuration, wiring
arrangement and location of equipment. A separate PETS 2 ‘Handbook for Design,
Installation and Maintenance’ (WEL part G42279) is available for use by competent
designers and maintainers.
TELECOMMUNICATIONS SAFETY
PETS 2 has isolated barriers to BS6301 on each circuit for connection to a
transmission system, or to a physical circuit between the Signalbox and

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remote location. Within the Junction Box, Block 3 is dedicated to these isolated circuits. The
25 way ‘D’ connector and its 10 pair cable are also dedicated to these isolated circuits. DO
NOT make connections between Block 3 circuits and other circuits of the PETS 2 system.
The Telecommunications safety earth is relevant to the local PETS 2 Telecommunication
circuits (Crossing Telephones), the PETS 2 power supplies and electronics. The ‘isolated’
circuits to remote sites via physical circuits or transmission equipment are always isolated
from the local earth (this is to ensure that ground potential differences do not cause
circulating currents)
WIRING
Telephone circuits carry low level signals, of a few hundred milli-volts. These
circuits are particularly susceptible to external electro-magnetic influences. It
is always advisable to avoid routing these cables near to power cables or
other potential interference sources. Provision is made within the Junction
Box for earthing of the cables, do so at the Junction Box end only. Ensure
there is a low impedance path to earth from the Telecommunications Earth
within the Junction Box.
LIGHTNING
A risk of lightning damage exists if the cables are external to a building, and/or the physical
circuit is overhead. If the risk of lightning strike is low then QDF protection
magazines should be fitted within the Junction Box, on the circuits at risk. If
the risk is high (cables conveyed overhead, or track-side) then separate
lightning protection should be installed, using a separate protection unit and
a dedicated earth point.
STATIC SENSITIVE PRECAUTIONS
PETS 2 plug in modules use components that are static sensitive. When
removing/ fitting plug in cards ensure that an anti-static wrist strap is worn.
The strap should be connected to the earth stud provided and marked with
the ‘Static Sensitive Handling’ label.

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CONTENTS
1. INTRODUCTION 7
2. EQUIPMENT SUPPLIED 7
2.1 Signal Box Kit (WEL part A35154) 7
2.2 Level Crossing Kit (WEL part A35155) 8
3. ACCESSORIES 8
4. OUTLINE DESCRIPTION 9
4.1 PETS 2 - Enhancements 10
4.2 Signal Box Unit 11
4.2.1 Item 1 - Connection Plate 11
4.2.2 Item 2 - Connector Retention bracket 12
4.2.3 Item 3 - Frame retention bolts 12
4.2.4 Item 4 - Right hand access plate 12
4.2.5 Item 5 - Front panel 12
4.3 Level Crossing Unit 13
4.3.1 Item 1 - Connection Plate 14
4.3.2 Item 2 - Connector Retention bracket 14
4.3.3 Item 3 - Frame retention bolts 14
4.3.4 Item 4 - Right hand access plate 15
4.3.5 Item 5 - Front panel 15
4.4 Inside the case 15
4.4.1 Item 6 - Transmission Card (A33837) 16
4.4.2 Item 7 - Line cards (A33838 - Level Crossing), (A35173 - Signalbox) 16
4.4.3 Item 8 - CPU card (A33839 - Level Crossing), (A35176 - Signalbox) 16
4.4.4 Item 9 - Power Supply & Ringer Card (A33898) 16
4.4.5 Item 10 - Fuseholder +12V (fused) 16
4.4.6 Item 11 - Earth stud for wrist strap 16
4.4.7 Item 12 - Card Pullers 16
4.4.8 Item 13 - Voltage selection link (refer to section 5.8.1) 17
5. INSTALLATION 19
5.1 Installation tools 19
5.2 Unpacking the equipment 19
5.3 Preparation 19

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5.4 Wall fixing 19
5.5 Safety Earth 22
5.6 Configuration 23
5.6.1 Signal Box Unit 24
5.6.2 Level crossing Unit 24
5.7 Front panels 25
5.7.1 Signalbox front panel 25
5.7.2 Level Crossing Unit front panel 26
5.8 Wiring 27
5.8.1 Power supply 30
5.8.2 Local telephone wiring (Level Crossing) 32
5.8.3 Transmission Circuits 33
5.8.4 Miscellaneous Wiring 34
6. TECHNICAL DATA 35
6.1 Mechanical details 35
6.2 Electrical 35
6.3 Telephony 35
6.3.1 Telephone Circuits 35
6.3.2 Transmission 35
6.4 Environmental 36

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LIST OF FIGURES
FIGURE 1 - PHOTOGRAPH OF SIGNALBOX UNIT 11
FIGURE 2 - PHOTOGRAPH OF LEVEL CROSSING UNIT 13
FIGURE 3 - PHOTOGRAPH OF THE CARD FRAME 15
FIGURE 4 - CARD REMOVAL TECHNIQUE 17
FIGURE 5 - SIGNALBOX UNIT SHOWING LABEL INSERTS 25
FIGURE 6 - LEVEL CROSSING UNIT (FRONT PANEL EARTH TAG) 26
FIGURE 7 - INTERNAL LAYOUT - JUNCTION BOX 27
FIGURE 8 - POWER SUPPLY VOLTAGE SELECTOR (APPLICABLE TO SB & LC UNITS)31

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1. INTRODUCTION
This handbook is provided to enable the basic installation of PETS 2 Signal Box and PETS
2 Crossing equipment. Basic installation covers the standard installation format - a single
Signalbox unit connected to a single Level Crossing unit. A competent design authority
must undertake a survey of the site prior to installation, and shall then provide any
additional installation instructions relating to the specific configuration, wiring arrangement
and location of equipment. A separate PETS 2 ‘Handbook for Design, Installation and
Maintenance’ (WEL part G42279) is available for use by competent designers and
maintainers.
This equipment conforms to an updated design, and most installers may be familiar with the
original PETS equipment. The most significant differences between PETS (original) and
PETS 2 are listed, as follows:
•External appearance - new colour and styling of front panels
•Front panels use labels, and buttons on the Signal Box unit use the label as a
‘membrane’ cover.
•External connections are now made through QDF IDC connectors within an external
junction box. Connections from the PETS 2 equipment are made through ‘D’ connectors
to 2 metre connecting leads, terminated on the QDF blocks.
•Power supply design accepts higher voltage transient levels and the unit includes EMC
filtering.
•Card extractors included and stowed within.
•Card frame removal from case improved.
•Case to wall fixing improved by rear ‘bumps’.
•Integration of power supply/ battery charger alarms
•Minor software changes.
•Equipment Alarm 7 segment display and ‘Interrogate’ button of the Signal Box unit may
be replaced by a remote display unit.
2. EQUIPMENT SUPPLIED
The Signal Box unit may be recognised by the four ‘CALL’ buttons on its front panel, red in
colour. The Level crossing unit may be distinguished by the large number of LED apertures
on its front panel. There are two line cards supplied with the Level Crossing unit, whereas
Signal Box units are supplied with one line card only.
The Junction box supplied with the Signal Box unit includes a pre-wired alarm sounder.
2.1 Signal Box Kit (WEL part A35154)
Upon opening the packaging, the contents should be checked to the following list:

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1 off PETS 2 Signal Box unit, with card removal ‘pullers’ (inside)
1 off Junction Box, complete with pre-wired connectorised leads.
1 off Installation Handbook (this book)
1 off 9 pin female ‘D’ connector (for the power supply lead)
1 off Earth lead - M6 ring terminal and 2 metre green/ yellow wire
2.2 Level Crossing Kit (WEL part A35155)
Upon opening the packaging, the contents should be checked to the following list:
1 off PETS 2 Level Crossing unit, with card removal ‘pullers’ (inside)
1 off Junction Box, complete with pre-wired connectorised leads.
1 off Installation Handbook (this book)
1 off 9 pin female ‘D’ connector (for the power supply lead)
1 off Earth lead - M6 ring terminal and 2 metre green/ yellow wire
3. ACCESSORIES
The following table provides information on the standard accessories available for use with
PETS 2:
WEL Part No. Signal Box Crossing Description
A33838 Note 2 Line Card - for local telephones. This Line card
is identical to the original PETS Line card; and
is also used on PETS 2 but within the Level
Crossing unit only.
A35173 Note 1 Line Card - Signalbox PETS2. This item is
different to the original due to a modified CALL
button arrangement.
A34566 (new
version from Q3
’98 - A35168)
Note 3 Note 3 Power supply and battery charger, batteries
not included.
A35166 Note 4 NA Remote Alarm Display Kit
A35169 Note 5 Note 5 Battery Set (4 off) 6Ahr
A35170 Note 5 Note 5 Battery Set (4 off) 12Ahr
A35171 Note 6 Note 6 Battery Set (4 off) 17Ahr
A35172 Note 7 Note 7 Firmware Upgrade (when applicable)
G42279 Note 8 Note 8 ‘Handbook for Design, Installation and
Maintenance’
G42279CD Note 8 Note 8 CD version of ‘Handbook for Design,

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WEL Part No. Signal Box Crossing Description
Installation and Maintenance’
Note 1 : The Signal Box unit is supplied with one Line Card. Additional line cards may be
required in the Signal Box Unit when working in Paired mode.
Note 2 : The Level crossing unit is supplied with two line cards; additional cards will be
required for paired mode or when four telephones have to be provided at a particular
crossing.
Note 3 : This is a wall mounted power supply and charger with integral shelves for the
batteries. The size of battery, and the number of PETS 2 units attached to each charger will
be determined by system design for the appropriate backup period. From Q3 1998 an
upgraded version of the charger will be available, providing enhanced monitoring and
integration with the PETS 2 equipment. The original Power Supply and Charger can be
used to power PETS 2.
Note 4 : The Remote Alarm Display Kit may be fitted at the Signalbox end and comprises a
small plastic enclosure with a seven segment display and ‘Interrogate’ button. This small
enclosure is to be fixed onto a wall or concentrator. The kit includes a ribbon connector
assembly, to be installed between the internal CPU and termination cards. Also supplied is
a 15 metre lead wired to the Remote Alarm Display. The other end of the cable is to be
terminated in the PETS 2 Junction Box.
Note 5 : Battery sets of 6Ahr or 12Ahr for use with the original and new version Power
Supply and Battery Charger.
Note 6 : The 17Ahr battery option is available with the new Power Supply and Battery
Charger, only.
Note 7 : Please check with WEL Sales Office before ordering. When firmware upgrades
are available, this code number relates to a single EPROM - the same EPROM is used
within the Signal Box and the Level Crossing units.
Note 8 : This handbook is intended for System Designers and Maintainers and covers a
wide range of topics not covered by this handbook. The document is available ring bound or
on CD in Adobe Acrobat .PDF format.
4. OUTLINE DESCRIPTION
This is not a detailed description of the PETS 2 equipment, merely an outline account
aimed at describing the features relevant to installation. Installers who are familiar with the
original PETS equipment should read section 4.1 carefully.

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The design of PETS 2 equipment is almost identical at the Signal Box and Level Crossing
ends. The major difference is the front panel arrangement. The Level Crossing Unit has a
metal front panel with formed edges fitting over the case. A label covers all of the front
panel apertures, and the arrangement (in conjunction with an internal rubber seal) ensures
that the case is sealed to IP55. The Signal Box unit has a front panel fitting to the internal
case edges. The front panel is a label membrane laminated to an aluminium back plate.
The Signal Box unit is not sealed to IP55; and other sealing arrangements, normally
associated with the Level crossing Unit, are omitted.
4.1 PETS 2 - Enhancements
The following list of bullet points should be noted by readers already familiar with the
installation of the original PETS equipment:
•Cable terminations are no longer to terminal blocks within. All terminations are available
through connectors on the side of PETS 2. A separate Junction Box complete with pre-
wired leads is supplied; QDF IDC connectors are used throughout.
•The equipment case has improved wall fixing, with ‘bumps’ to allow for irregular wall
surfaces and to recess the fixing screw head.
•The Euroframe is easier to remove from the case.
•The auxiliary 12V dc supply is now independently fused.
•Card pullers are provided with each unit and are stowed behind the front panel.
•A stud for an ‘Anti-static wrist strap’ is now provided behind each front panel.
•The firmware has been revised to incorporate some improvements and some new
features.
•Barrier signalling on Line 1 has been re-allocated to bi-directional signalling of a mains/
charger fail alarm.
•Barrier Signalling Inputs and Outputs are no longer ‘volt free’. To simplify the wiring these
circuits are referenced to the secondary supply (+12V & 0V) of PETS 2.
•Front panels have been totally re-styled
•Earthing and EMC arrangements have been improved.
•Power supply has upgraded components allowing operation with higher input voltage
surges and transients.
•CPU card has been modified to allow remote seven segment display and maintain the
display within the Signal Box Unit.
•Front panel master alarms (previously referenced as Alarm 1 & Alarm 2) are now termed
Minor and Major. Positions on the front panel have been transposed.
•Firmware is different between new and old PETS equipment; but original PETS firmware
is also available with the new features.

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4.2 Signal Box Unit
Figure 1 - Photograph of Signalbox Unit
The Signal Box unit is designed for wall mounting, although it may sometimes be adapted
for rack mounting. The casing of Signal Box and Level Crossing units are identical, but the
front panel arrangements are entirely different.
On the Signal Box units, the front panel comprises a membrane / label front laminated onto
a 4mm aluminium plate. This is fitted ‘inside’ the case edges, allowing the panel to be
recessed more than the Level crossing arrangement. This recessing enables the buttons
(on the cards within) to be activated through the front membrane. This presents a smooth,
wipe clean front panel, with the advantage of having ‘real’ push buttons. Unused button
locations are protected by a supporting disk behind the membrane, at each unused location
(Lines 2,3 & 4 on a standard Signal Box Unit).
4.2.1 Item 1 - Connection Plate
Shown in the photograph (Fig. 1) without connectors and Connector Retention bracket. All
of the connections to PETS are made through plug/ socket ‘D’ type connectors to the left
hand side of the unit. On the Signal Box unit, these connectors are not environmentally
sealed. However, the connector arrangements are novel as their right angle shells are used
Item 3
Fr
a
m
e
R
ete
n
t
i
o
n
bo
l
t
Item 5
Fr
o
n
t
pa
n
e
l
Item 1
Connection
Plate
Connector retention
bracket, upper fixing screw.

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to direct the cables to the wall. Right angle connector cannot use the more conventional
screw lock arrangement, and these connectors (all three) are retained in place by means of
a Connector Retention bracket. The connectors have the following functions:
1. 9 pin ‘D’ connector - power supply input and mains/charger alarm.
2. 25 pin ‘D’ connector - isolated telecommunications interfaces, i.e. transmission circuits.
3. 50 pin ‘D’ connector - all other PETS circuits, e.g. crossing telephones, etc.
Connectors 2 & 3 above are pre-wired to a Junction Box.
4.2.2 Item 2 - Connector Retention bracket
The photograph (Fig. 1) does not show this bracket. This bracket fits onto the Connector
Plate using the middle two screws, the upper screw is identified in the photograph. This
retention bracket has a series of forms to apply pressure at the rear of each ‘D’ connector
shell. As the bracket is fixed into position, by tightening the two fixing screws, the ‘D’
connectors become locked and fully mated.
4.2.3 Item 3 - Frame retention bolts
Shown in the photograph (Fig. 1) are the two left side retention bolts. The entire inner card
frame is removable from the outer casing. The two M6 hexagonal bolt heads at each side
secure the frame within the case. These bolts must not be removed unless the procedure
described in section 5.4 is followed.
4.2.4 Item 4 - Right hand access plate
The right hand access plate is equipped with a series of 20mm knockouts. This plate is not
usually required for standard installations. It has been retained in PETS 2 to allow access to
the right hand side of the frame and the motherboard. The right hand side of the case, and
this plate, cannot be seen in the photograph (Fig. 1)
4.2.5 Item 5 - Front panel
The front panel has a polyester membrane laminated onto an aluminium backing plate. This
Polyester membrane also serves as a label to identify the functions of the PETS 2 Signal
Box Unit. The front panel is secured to the internal card frame by means of the four button
head Allen Key M4 screws at the front. The following aspects of the front panel are of
particular note:
a) CALL buttons - The Signal Box Unit is equipped with a single Line Card, as standard.
The remaining CALL buttons allocated to Lines 2,3 & 4 have a blanking plug fitted to the
inside of the front panel, thereby preventing movement of the Polyester membrane in the
unused locations. The blanking plug will be removed in case of installing additional line
cards.

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b) Line Identification window - Each Crossing will be geographically identified by a label to
be inserted from the top edge of the front panel, between the front Polyester membrane
and the aluminium panel. When the front panel is fitted it is not possible to access the
opening for this label, hence the label is securely located after installation. The black
PVC tape to the rear of the front panel is to prevent the LED’s behind from showing
through the paper insert labels. This is particularly relevant to Line 1, to prevent
illumination if a mains/ charger alarm occurs. When ‘Barrier Alarm signalling’ is required
on Line Cards 2, 3 or 4; puncture a hole in the PVC tape to selectively allow operation of
the required LED’s. In the photgraph the paper label inserts can be seen behind each
window.
c) Service Provider Identification window - an additional window is provided, with access
from the right hand edge of the front panel. This window will be used to identify the
Service Provider and fault notification telephone number.
Front panel layout is broken into functional sections, and the Fault Codes are identified with
a brief explanation to allow the Signaller to give a detailed indication of the fault status when
reporting problems. The INTERROGATE (a large lower case ‘i’ legend) button allows the
unit to be interrogated and the seven segment display to cycle through each alarm in the
event of multiple alarms. Other LED indicators are visible through the front panel, allowing
the general status of PETS 2 to be visible.
4.3 Level Crossing Unit
Figure 2 - Photograph of Level Crossing Unit
Item 3 - Frame retention
bo
l
t
&
case
ea
r
t
h
po
in
t
Item 1 - Connection Plate

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The Level Crossing Unit outer case is identical to that of the Signal Box unit. The case was
originally intended to be compatible with the space taken by two BR Signalling Relays,
although normal practise is to install the unit within an equipment room. PETS 2 retains the
environment capability to be installed into a signalling or telecommunications track-side
location cabinet. The Level Crossing Unit is sealed to IP55, and internal PCB’s (of both
units) are conformally coated for added environmental protection. The front panel
arrangement of the Level Crossing Unit is entirely different to that of the Signal Box Unit.
The Level Crossing Unit has no front panel operated buttons, and the panel is placed
further forward to allow dust & water seal to be made between the front panel and the case.
All of the internal indicators are visible through a label fitted to the front panel. Other
features are detailed below:
4.3.1 Item 1 - Connection Plate
This is identified at the left side of the photograph (Fig.2). The arrangement of connectors is
identical to that of the Signal Box, please refer to 4.2.1. However, the following important
differences should be noted:
a) A foam rubber seal is provided around the ‘D’ connectors of the Level crossing Unit to
maintain the IP55 seal
b) The Junction box of the Level Crossing Unit is different to that of the Signal Box, for
instance there is no alarm sounder in the Level Crossing Unit Junction Box.
NOTE: It is recommended that Silica Gel bags are inserted in the Level Crossing Unit case
and inside the Junction Box as a precaution against the effects of condensation.
4.3.2 Item 2 - Connector Retention bracket
The Connector rention bracket is not shown in this photograph (Fig. 2), but it is visible in Fig
5. The bracket fits onto the Connector Plate using the middle two screws. This retention
bracket has a series of forms to apply pressure at the rear of each ‘D’ connector shell. As
the bracket is fixed into position, by tightening the two fixing screws, the ‘D’ connectors
become locked and fully mated.
4.3.3 Item 3 - Frame retention bolts
Two of the rention bolts can be seen on the left side, the lower bolt is identified on the
photograph (Fig. 2), and this has a special significance as the main earth point for the case.
The entire inner card frame is removable from the outer casing. The two M6 hexagonal bolt
heads at each side secure the frame within the case. These bolts must not be removed
unless following the procedure described in section 5.4

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4.3.4 Item 4 - Right hand access plate
Photograph (Fig. 2) does not show the right hand side of the case, consequently Item 4 is
not identified. The right hand access plate is equipped with a series of 20mm knockouts.
This plate is not usually required for standard installations. It has been retained in PETS 2
to allow access to the right hand side of the frame and the motherboard.
4.3.5 Item 5 - Front panel
On the Level Crossing Unit the front panel takes the form of a metal tray with turned up
edges. Around the inside edge a strip of foam rubber sealing material is fitted, when the
front panel is fitted the seal is compressed by the edge of the case.
The front panel label allows all of the LED’s within to be visible, including the seven
segment Fault Code display. It is necessary to remove the front panel, by means of the four
fixing screws, to access the ‘Interrogate’ button to review multiple alarms. Removal of the
front panel will reveal the RESET button (immediately beneath the seven segment display).
The Interrogate button is beneath the RESET button.
4.4 Inside the case
Figure 3 - Photograph of the Card frame
Item 11
Stud
f
o
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a
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t
i-
stat
i
c
wri
st
st
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ap
Item 10
F
use
- 1
00
mA f
o
r +12V
e
x
te
rn
a
lItem 12
Card puller stowage
TX card Line card 1 Line card 2 CPU card Power su
pp
l
y
& rin
g
er card

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4.4.1 Item 6 - Transmission Card (A33837)
There is a single Transmission Card in each frame, located to the left hand side. The card
is identical at Signalbox and at the Level Crossing.
4.4.2 Item 7 - Line cards (A33838 - Level Crossing), (A35173 - Signalbox)
In the Signalbox unit a single line card is provided in the Line 1 position. The card is
electrically identical to those of the Level Crossing, the only difference being the button
arrangement for use with the membrane overlay.
In the Level Crossing units, Line1 and Line 2 cards are fitted.
4.4.3 Item 8 - CPU card (A33839 - Level Crossing), (A35176 - Signalbox)
The Signalbox card is electrically identical to those of the Level Crossing, the only
difference being the button arrangement for use with the membrane overlay. This card
houses the seven segment display and the system firmware. The same version of firmware
can be used throughout. DIL switches on the motherboard distinguish the Signalbox and
Level Crossing units, additionally establishing whether the hardware is original PETS or
PETS 2.
4.4.4 Item 9 - Power Supply & Ringer Card (A33898)
There is a single Power Supply & Ringer Card in each frame, located to the right hand side.
The card is identical at Signalbox and at the Level Crossing.
4.4.5 Item 10 - Fuseholder +12V (fused)
Located to the left hand side this fuse protects the external +12V from the frame.
4.4.6 Item 11 - Earth stud for wrist strap
Connection point for wrist straps
4.4.7 Item 12 - Card Pullers
A pair of card pullers are located to the right hand side. This is a convenient stowage
location. The large ring is to be pulled by the fore-finger of each hand. The bent end of each
puller is located in the upper or lower holes at the front edge of each card. See photograph

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(Fig. 3) for the removal technique. NOTE: Power Supply & Ringer cards have a lower hole
only, i.e. only one puller to be used on this card.
Figure 4 - Card removal technique
IMPORTANT: All cards, except the Power Supply & Ringer Card, have an upper and lower
hole at the front allowing both pullers to be used. The Power Supply & Ringer card has a
lower hole only and the single puller must be angled to be central - providing an even
removal force. Each card is polarised. Ensure that cards are inserted in the correct slot.
Forcing a card into the wrong slot may result in damage to the connector pins.
4.4.8 Item 13 - Voltage selection link (refer to section 5.8.1)
Factory set for 50V operation. Item 13 is located on the motherboard, to the right hand side
of the Power Supply and Ringer Card.

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5. INSTALLATION
The instructions given in this section will assume that the installation is of the most common
type; a single AHB crossing with just one telephone either side of the line, and a single
PETS Signal Box Unit, manually controlled. It is assumed that the installation has been
surveyed by a competent and trained technician, and that the installer has been given any
additional or contrary instructions along with the equipment and this manual.
Before attending site produce the paper labels for insertion within the windows of the
Signalbox Unit. To receive the latest version of the label pro-forma in WORD 6 format, send
an e-mail request to :
we[email protected] [please give your name and company - we will also send
update bulletins by return]
5.1 Installation tools
The following tools will be required:
1. Montdragon (formerly ADC) QDF IDC tool.
2. 10mm ring spanner
3. 2mm Allen Key
4. Soldering Iron (15watt fine tip, recommended), and self fluxed solder.
5. Screwdrivers, flat blade various sizes.
6. Scissors (for labels)
7. Wire cutters
8. Pen knife
5.2 Unpacking the equipment
Check the external packing labels before proceeding to distinguish the Signal Box Unit from
the Level Crossing Unit. Use a small pen knife to open the carton sealing tape, do not cut
into the carton more than 5mm, to avoid damage to the equipment within. Remove the
contents.
The packing carton is made of cardboard and may be re-cycled.
5.3 Preparation
Decide where the unit is to be installed, normally this will be onto a wall. The Signal Box
Unit must be installed in a clean and dry location, away from windows that may be left open,
and away from sources of steam or condensation. From the Junction Box, 2 metre cables
with connectors at the ends are to be mated with the PETS unit, into the left hand side
connector plate. The cables are normally kept in place within trunking or by cable clips.
5.4 Wall fixing
It is necessary to disassemble the PETS 2 unit, the procedure is identical for Signal Box
and for the Level Crossing Units:

Page 20 of 40
Issue 2
13/12/99
PETS-2 Crossing Telephone System
QUICKFIX INSTALLATION HANDBOOK
20
a) Remove the front panel by undoing the
four M4 fixing screws on the front panel,
using the 2mm Allen key. Keep the
screws and washers together, washers
are essential to prevent damage to the
Level Crossing front panel membrane/
label. The front panel will just lift off (the
Signal Box unit may require gentle
prising to remove the front panel from the
inner edges of the case). An earth lead
will be attached to the Level Crossing
front panel and its push fit spade can be
pulled away from the tag of the panel.
b) Remove the Card Pullers from their
stowage location on the right hand side. A)Remove all eight M3
slotted head screws
(and their washers)
from the left hand
Connection Plate
and the Connector
Retention bracket.
This plate may be
lifted away from the
‘D’ connectors.
IMPORTANT: THIS
PLATE MUST BE
REMOVED BEFORE
ATTEMPTING TO
PULL THE CARD
FRAME FROM THE
CASE. DO NOT UNDO THE FRONT
FOUR M6 SLOTTED SCREWS .
b) Loosen the four M6 hexagonal head
bolts (two each side of the case), using
the 10mm ring spanner. Remove the
lower bolts each side, then support the
frame with one hand whilst removing
the two upper bolts. Pull the frame (still
attached to the left and right brackets)
out of the case. Remove the remaining
earth tag, at the rear of the case, to
allow the frame to be separated from
the case. Carefully stow all of the
removed items.