VIPA CP 240 RS232, Руководство пользователя

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Manual VIPA System 200V Chapter 2 Assembly and installation guidelines
HB97E - CP - Rev. 11/30 2-13
In many cases, adherence to a set of very elementary rules is sufficient to
ensure EMC. For this reason we wish to advise you to heed the following
rules when you are installing your controllers.
•
During the installation of your components you have to ensure that any
inactive metal components are grounded via a proper large-surface
earth.
- Install a central connection between the chassis ground and the
earthing/protection system.
- Interconnect any inactive metal components via low-impedance
conductors with a large cross-sectional area.
- Avoid aluminum components. Aluminum oxidizes easily and is
therefore not suitable for grounding purposes.
•
Ensure that wiring is routed properly during installation.
- Divide the cabling into different types of cable. (Heavy current,
power supply, signal and data lines).
- Install heavy current lines and signal or data lines in separate
channeling or cabling trusses.
- Install signaling and data lines as close as possible to any metallic
ground surfaces (e.g. frames, metal rails, sheet metal).
•
Ensure that the screening of lines is grounded properly.
- Data lines must be screened.
- Analog lines must be screened. Where low-amplitude signals are
transferred, it may be advisable to connect the screen on one side
of the cable only.
- Attach the screening of cables to the ground rail by means of large
surface connectors located as close as possible to the point of
entry. Clamp cables mechanically by means of cable clamps.
- Ensure that the ground rail has a low-impedance connection to the
cabinet/cubicle.
- Use only metallic or metallized covers for the plugs of screened
data lines.
•
In critical cases you should implement special EMC measures.
- Connect snubber networks to all inductive loads that are con-
trolled by System 200V modules.
- Use incandescent lamps for illumination purposes inside cabinets
or cubicles, do not use fluorescent lamps.
•
Create a single reference potential and ensure that all electrical equip-
ment is grounded wherever possible.
- Ensure that earthing measures are implemented effectively. The con-
trollers are earthed to provide protection and for functional reasons.
- Provide a star-shaped connection between the plant, cabinets/cubi-
cles of the System 200V and the earthing/protection system. In this
way you avoid ground loops.
- Where potential differences exist you must install sufficiently large
equipotential bonding conductors between the different parts of the
plant.
The most
important rules for
ensuring EMC