80 EAV64301 01/2015
Electromagnetic Compatibility
Limit Values
This product meets the EMC requirements according to the standard IEC 61800-3 if the measures
described in this manual are implemented during installation. If the selected composition (product itself,
mains filter, other accessories and measures) does not meet the requirements of category C1, the
following information applies as it appears in IEC 61800-3:
EMC requirements for the control cabinet
Shielded cables
Cable Installation
WARNING
RADIO INTERFERENCE
In a domestic environment this product may cause radio interference in which case supplementary
mitigation measures may be required.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
EMC measures Objective
Use mounting plates with good electrical conductivity, connect large surface areas of metal parts, remove
paint from contact areas.
Good conductivity due to large
surface contact.
Ground the control cabinet, the control cabinet door and the mounting plate with ground straps or ground
wires. The conductor cross section must be at least 10 mm
2
(AWG 8).
Reduces emissions.
Fit switching devices such as power contactors, relays or solenoid valves with interference suppression units
or arc suppressors (for example, diodes, varistors, RC circuits).
Reduces mutual interference.
Install power components and control components separately.
EMC measures Objective
Connect large surface areas of cable shields, use cable clamps and ground straps. Reduces emissions.
Use cable clamps to connect a large surface area of the shields of all shielded cables to the mounting plate
at the control cabinet entry.
Ground shields of digital signal wires at both ends by connecting them to a large surface area or via
conductive connector housings
Reduces interference affecting
the signal wires, reduces
emissions
Ground the shields of analog signal wires directly at the device (signal input); insulate the shield at the other
cable end or ground it via a capacitor (for example, 10 nF, 100 V or higher.
Reduces ground loops due to
low-frequency interference.
Use only shielded motor cables with copper braid and a coverage of at least 85%, ground a large surface
area of the shield at both ends.
Diverts interference currents in
a controlled way, reduces
emissions.
EMC measures Objective
Do not route fieldbus cables and signal wires in a single cable duct together with lines with DC and AC
voltages of more than 60 V. (Fieldbus cables, signal lines and analog lines may be in the same cable duct)
Recommendation: Use separate cable ducts at least 20 cm apart.
Reduces mutual interference.
Keep cables as short as possible. Do not install unnecessary cable loops, use short cables from the central
grounding point in the control cabinet to the external ground connection.
Reduces capacitive and
inductive interference.
Use equipotential bonding conductors in the following cases: wide-area installations, different voltage
supplies and installation across several buildings.
Reduces current in the cable
shield, reduces emissions.
Use fine stranded equipotential bonding conductors. Diverts high-frequency
interference currents
If motor and machine are not conductively connected, for example by an insulated flange or a connection
without surface contact, you must ground the motor with a ground strap or a ground wire. The conductor
cross section must be at least 10 mm2 (AWG 6).
Reduces emissions, increases
immunity.
Use twisted pair for the DC supply.
For digital and analog inputs use shielded twisted cables with a pitch of between 25...50 mm (1...2 in).
Reduces interference affecting
the signal cables, reduces
emissions.
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