Matrix Vision System Manual page 16

Matrix
Protecting the System from heavy voltage on the PAS port:
The PAS port of the Vision should be protected from:
• Heavy voltages on the cable connecting the Vision and the amplifier/speaker due to shorting with any
electrical wire.
• Faulty Amplifier
Protecting the System from heavy voltage on the DIP:
The DIP of the Vision should be protected from:
• Heavy voltages on the cable connecting the Vision and the panic switch or the sensor.
• Faulty panic switch or the sensor.
Protecting the System from heavy voltage on the Relay Port:
The Relay port of the Vision should be protected from:
• Heavy voltages on the cable connecting Vision and the Equipment/Doorlock/Contactor connected to it.
• Faulty or overrated Contactor/Equipment/Doorlock.
Protecting the System from Lighting:
Protecting the system from high current surges is achieved by installing primary protection device. A lightning
protector is a primary protection device which is used to prevent a dangerous surge from entering the building
and damaging the system. For equipment installed in a more exposed environment, it is necessary to protect
the system with primary protectors such as PPMs. With the development of electronic equipment, problems due
to lighting surges have increased. A dangerous surge can occur if a telephone line comes in contact with a
power line. A lightning protector should be installed on an outside (CO) line to prevent a dangerous surge from
entering the building and damaging the system. The best place for the insertion of the primary protection is the
cable entry point of the building, shelter or equipment housing.
CO Line
CO Line
System
Lightning
Protective Earth
Protectors
Terminal
Telecom Earth
This is not always possible but every attempt should be made to place the primary protection as close as
possible to the entry point of the cables into the building, shelter or equipment housing. Hence, the system
should be installed with lighting protectors. In addition, grounding (connection to earth ground) is very
important to protect the system.
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16 Vision System Manual