Page
10 of 40
Issue 2
13/12/99
PETS-2 Crossing Telephone System
QUICKFIX INSTALLATION HANDBOOK
10
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.