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Electrical installation
MSD Single-Axis System Operation Manual AC-AC Servo Drive
ID no.: CA65642-001 06/2018
moog
4.2.3 Usage with mains choke
The usage of mains chokes is:
y Required on all devices from and including Size 5
y Required on the usage of the servo drive in harsh industrial systems
y Recommended to increase the life of the DC link capacitors
4.2.4 Usage with internal mains lters
The servo drives Size 1 to Size 5 are equipped with integrated mains lters. With
the measurement method specied by the standard, the servo drives meet the EMC
protection goals according to IEC/EN 61800-3 for "First environment" (residential
C2) and "Second environment" (industrial C3). For more detailed information see
chapterA.6.
NOTE:
The servo drives described here are a restricted availability product
in accordance with IEC/EN 61800-3. They can cause interference in
residential areas. In such a case, the operator may need to take appropriate
countermeasures.
4.2.5 Usage with external mains lters
External RFI lters (CA71188-001 to CA71190-001, CB09932-001) are available for
the servo drives Size 6 and Size 6A. With the measurement method specied and the
external mains lter, these servo drives also conform to the EMC product standard
IEC/EN61800-3 for "First environment" (residential C2) and "Second environment"
(industrial C3).
Whether an external mains lter is required for the devices of size Size 7 depends on the
type of connection and the local situation. For this reason the usage of a mains lter is to
be considered in the specic case and decided during project planning.
To make it possible to use longer motor cables and achieve compliance with the EMC
product standard IEC/EN 61800-3 for the "general availability" (residential C1), additional
external mains lters are available for devices with an internal mains lter (Size 1 to
Size5).
4.2.6 Earthing measures
All earthed points and components must be routed directly to the central earthing
point (e.g. PE rail, main earth) with as low an impedance as possible and with good
conductivity. In this way an earthing system is produced that connects all connections to
the earthing point in a star topology. This central earthing point is to be clearly dened.
This earthing point can be extended to the entire backing plate with an effective EMC
connection.
You should take into account the following points for the earthing:
y Earthed surfaces act as shielding measures and reduce electromagnetic elds in the surrounding
area. For this reason metal surfaces should be connected to ground with low-impedance HF
connections. In terms of EMC it is not the cross-section of the cable that is denitive, but the
surface over which high-frequency currents caused by the skin effect can ow away.
y Connect the protective earth conductors for the components in the switch cabinet using a star
topology.
y Avoid the use of connectors.
y Also connect the walls and doors of the switch cabinet to ground.
y Earth unused cores at one end as a minimum so that there is no electrostatic charging.
y Free contact areas of paint and corrosion and make large area connections.
y The usage of tinned, galvanised, aluminised or cadmium-plated elements is to be preferred over
painted components; it will then not be necessary to remove the paint. Connectors are to be
avoided, or several contacts are to be used for the shield connection in the connector.
For further information on the cross-section of the protective earth conductor see “4.6
Connection of PE conductor”.
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