Technologies has successfully completed over 50 major contracts to
manufacture it's Power Reticulation Telemetry System and is busy with yet
MS Tech technical
director Michael Horvitch said the equipment controls the electrification
of sections of rail lines and is used for the monitoring, control and
collection of billing information for the rail carrier. "This is
controlled remotely from a central master station via a remote modem
connection," he explained.
The rail operator also
uses the equipment for switching off of the power to a section of line to
prevent head on collisions between trains when other systems have failed,
restoring power to a section of line in the event of a circuit breaker
trip, monitoring "vital signs" of a substation, remote shutdown
of substations for maintenance and providing the control center with
information regarding traffic, power consumption, security and failures of
However, use of the
system is not restricted to railway lines. It can be used in many
applications including water reticulation and traffic robots.
"The system has
isolated 2,5KV digital inputs to monitor the condition of the switchgear
and the power on the line. Relays are used as isolated outputs to the
switches. Analog inputs are also available for interfacing to devices with
4-20mA outputs with Industrial grade isolation," explained Horvitch.
The power supply has been
designed to accept DC input ranging from 18-130V to allow the system to
work off either the available 24V or 110V DC supply.
"The MMI (man
machine interface) consists of a membrane keypad and a LCD display. This
allows for quick and easy setup and configuration on site. It also allows
the technician to monitor and control the various peripherals directly
without needing assistance from the master station," added Horvitch.
The modem employed was
also designed by Murton System Technologies. The heart of the modem is a
Digital Signal Processor (DSP) which, through software, can be configured
to 'talk' to any protocol the customer may require - including
Westinghouse and Selinia. All interfacing between the main control logic
is done via 'Rail Cards'. These cards are mounted on a DIN rails and
provide additional isolation as well as convenient connection points. They
are intended to protect the rest of the system from ESD and surges. Rail
cards are easy to replace and can be changed quickly if they are damaged.
The main logic is housed
in a standard 19" logic sub-rack. This consists of various plug in
cards allowing the customer to configure each system to his exact
requirements. It also enables quick and easy replacement of faulty boards
in the field so as to minimize downtime.
The entire system is
manufactured in South Africa by Murton System Technologies with over 1,000
complete systems having already been installed around the country.