Electromagnetic Compatibility (EMC)
3-4
Installation Manual: PSS 3032
• Data and signal lines should be laid as close as possible to an earthed
surface.
Cabling to open air systems:
• As far as possible use metal conduits. These should be electrically
connected and earthed.
• Ensure there is sufficient protection against lightning by:
- Using metal conduits earthed at both ends, or concrete cable ducts
with reinforcements connected across the joints.
Equipotential bonding
Potential differences can occur through potential connected couplings
between the PSS and peripheral devices or cable shields, which are
connected at either end and have different earth connections. In order to
avoid interference, equipotential bonding cables must be installed. In
doing so, you must ensure the following:
• Select a low impedance equipotential bonding cable.
• If the PSS and peripheral devices are connected with screened signal
cables which are earthed at either end, the impedance is calculated as
follows:
Impedance equipotential bonding cable = 10% of screen impedance.
• Select the following as standard values for the cross section of the
equipotential bonding cable:
16 mm
2
for equipotential bonding cables up to 200 m in length.
25 mm
2
for equipotential bonding cables over 200 m in length.
• Use copper or galvanised steel equipotential bonding cable.
• Connect equipotential bonding cables to the earth conductor over as
wide a surface area as possible.
• As short a distance as possible should be kept between the equipotential
bonding cable and signal cable.
Summary of Contents for PSS 3032
Page 2: ...Programmable control systems PSS PSS 3032 Installation Manual Item No 19 891...
Page 7: ...Introduction 1 2 Installation Manual PSS 3032 Notes...
Page 24: ...Installation Manual PSS 3032 5 3 Notes...
Page 39: ...Connecting the Inputs and Outputs 5 18 Installation Manual PSS 3032 Notes...
Page 41: ...Interfaces 6 2 Installation Manual PSS 3032 Notes...
Page 43: ...Appendix 7 2 Installation Manual PSS 3032 Notes...
