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Preface
EDBC250SBC |1.1
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9
Electrical Immission Safeguard
To eliminate electromagnetic interference, connect the control system to the protective
earth conductor. Practice best cable routing.
Cable Routing and Wiring
Keep power circuits separate from control circuits:
•
DC voltages
60 V ... 400 V
•
AC voltages
25 V ... 400 V
Joint laying of control circuits is allowed for:
•
shielded
data signals
•
shielded
analogue signals
•
unshielded
digital I/O lines
•
unshielded
DC voltages < 60 V
•
unshielded
AC voltages < 25 V
Location of Installation
Ensure that temperatures, contaminations, impact, vibration or electromagnetic interference
are no impediment to the installation.
Temperature
Consider heat sources such as general heating of rooms, sunlight, heat accumulation in
assembly rooms or control cabinets.
Contamination
Use suitable casings to avoid possible negative influences due to humidity, corrosive gas, liquid
or conducting dust.
Impact and Vibration
Consider possible influences caused by motors, compressors, transfer lines, presses, ramming
machines and vehicles.
Electromagnetic Interference
Consider electromagnetic interference from various local sources: motors, switching devices,
switching thyristors, radio-controlled devices, welding equipment, arcing, switched-mode
power supplies, converters / inverters.
Particular Sources of Interference
Inductive Actuators
Switching off inductances (such as from relays, contactors, solenoids or switching magnets)
produces surge voltages. It is necessary to reduce these extra voltages to a minimum.
Throttling elements could be diodes, Z-diodes, varistors or RC elements. Their rating should
conform to the specifications provided by the manufacturer or supplier of the actuators.
